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-rw-r--r--src/cmd/5c/Makefile34
-rw-r--r--src/cmd/5c/cgen.c1199
-rw-r--r--src/cmd/5c/doc.go14
-rw-r--r--src/cmd/5c/gc.h384
-rw-r--r--src/cmd/5c/list.c340
-rw-r--r--src/cmd/5c/mul.c640
-rw-r--r--src/cmd/5c/peep.c1468
-rw-r--r--src/cmd/5c/reg.c1195
-rw-r--r--src/cmd/5c/sgen.c267
-rw-r--r--src/cmd/5c/swt.c694
-rw-r--r--src/cmd/5c/txt.c1298
11 files changed, 7533 insertions, 0 deletions
diff --git a/src/cmd/5c/Makefile b/src/cmd/5c/Makefile
new file mode 100644
index 000000000..70b614e8a
--- /dev/null
+++ b/src/cmd/5c/Makefile
@@ -0,0 +1,34 @@
+# Copyright 2009 The Go Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+
+include ../../Make.inc
+O:=$(HOST_O)
+
+TARG=5c
+
+HFILES=\
+ gc.h\
+ ../5l/5.out.h\
+ ../cc/cc.h\
+
+OFILES=\
+ cgen.$O\
+ list.$O\
+ sgen.$O\
+ swt.$O\
+ txt.$O\
+ mul.$O\
+ reg.$O\
+ peep.$O\
+ pgen.$O\
+ pswt.$O\
+ ../5l/enam.$O\
+
+LIB=\
+ ../cc/cc.a\
+
+include ../../Make.ccmd
+
+%.$O: ../cc/%.c
+ $(HOST_CC) $(HOST_CFLAGS) -c -I. -o $@ ../cc/$*.c
diff --git a/src/cmd/5c/cgen.c b/src/cmd/5c/cgen.c
new file mode 100644
index 000000000..9e74f515b
--- /dev/null
+++ b/src/cmd/5c/cgen.c
@@ -0,0 +1,1199 @@
+// Inferno utils/5c/cgen.c
+// http://code.google.com/p/inferno-os/source/browse/utils/5c/cgen.c
+//
+// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
+// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
+// Portions Copyright © 1997-1999 Vita Nuova Limited
+// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
+// Portions Copyright © 2004,2006 Bruce Ellis
+// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
+// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
+// Portions Copyright © 2009 The Go Authors. All rights reserved.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+
+#include "gc.h"
+
+void
+_cgen(Node *n, Node *nn, int inrel)
+{
+ Node *l, *r;
+ Prog *p1;
+ Node nod, nod1, nod2, nod3, nod4;
+ int o, t;
+ int32 v, curs;
+
+ if(debug['g']) {
+ prtree(nn, "cgen lhs");
+ prtree(n, "cgen");
+ }
+ if(n == Z || n->type == T)
+ return;
+ if(typesuv[n->type->etype]) {
+ sugen(n, nn, n->type->width);
+ return;
+ }
+ l = n->left;
+ r = n->right;
+ o = n->op;
+ if(n->addable >= INDEXED) {
+ if(nn == Z) {
+ switch(o) {
+ default:
+ nullwarn(Z, Z);
+ break;
+ case OINDEX:
+ nullwarn(l, r);
+ break;
+ }
+ return;
+ }
+ gmove(n, nn);
+ return;
+ }
+ curs = cursafe;
+
+ if(n->complex >= FNX)
+ if(l->complex >= FNX)
+ if(r != Z && r->complex >= FNX)
+ switch(o) {
+ default:
+ regret(&nod, r);
+ cgen(r, &nod);
+
+ regsalloc(&nod1, r);
+ gopcode(OAS, &nod, Z, &nod1);
+
+ regfree(&nod);
+ nod = *n;
+ nod.right = &nod1;
+ cgen(&nod, nn);
+ return;
+
+ case OFUNC:
+ case OCOMMA:
+ case OANDAND:
+ case OOROR:
+ case OCOND:
+ case ODOT:
+ break;
+ }
+
+ switch(o) {
+ default:
+ diag(n, "unknown op in cgen: %O", o);
+ break;
+
+ case OAS:
+ if(l->op == OBIT)
+ goto bitas;
+ if(l->addable >= INDEXED && l->complex < FNX) {
+ if(nn != Z || r->addable < INDEXED) {
+ if(r->complex >= FNX && nn == Z)
+ regret(&nod, r);
+ else
+ regalloc(&nod, r, nn);
+ cgen(r, &nod);
+ gmove(&nod, l);
+ if(nn != Z)
+ gmove(&nod, nn);
+ regfree(&nod);
+ } else
+ gmove(r, l);
+ break;
+ }
+ if(l->complex >= r->complex) {
+ reglcgen(&nod1, l, Z);
+ if(r->addable >= INDEXED) {
+ gmove(r, &nod1);
+ if(nn != Z)
+ gmove(r, nn);
+ regfree(&nod1);
+ break;
+ }
+ regalloc(&nod, r, nn);
+ cgen(r, &nod);
+ } else {
+ regalloc(&nod, r, nn);
+ cgen(r, &nod);
+ reglcgen(&nod1, l, Z);
+ }
+ gmove(&nod, &nod1);
+ regfree(&nod);
+ regfree(&nod1);
+ break;
+
+ bitas:
+ n = l->left;
+ regalloc(&nod, r, nn);
+ if(l->complex >= r->complex) {
+ reglcgen(&nod1, n, Z);
+ cgen(r, &nod);
+ } else {
+ cgen(r, &nod);
+ reglcgen(&nod1, n, Z);
+ }
+ regalloc(&nod2, n, Z);
+ gopcode(OAS, &nod1, Z, &nod2);
+ bitstore(l, &nod, &nod1, &nod2, nn);
+ break;
+
+ case OBIT:
+ if(nn == Z) {
+ nullwarn(l, Z);
+ break;
+ }
+ bitload(n, &nod, Z, Z, nn);
+ gopcode(OAS, &nod, Z, nn);
+ regfree(&nod);
+ break;
+
+ case ODIV:
+ case OMOD:
+ if(nn != Z)
+ if((t = vlog(r)) >= 0) {
+ /* signed div/mod by constant power of 2 */
+ cgen(l, nn);
+ gopcode(OGE, nodconst(0), nn, Z);
+ p1 = p;
+ if(o == ODIV) {
+ gopcode(OADD, nodconst((1<<t)-1), Z, nn);
+ patch(p1, pc);
+ gopcode(OASHR, nodconst(t), Z, nn);
+ } else {
+ gopcode(OSUB, nn, nodconst(0), nn);
+ gopcode(OAND, nodconst((1<<t)-1), Z, nn);
+ gopcode(OSUB, nn, nodconst(0), nn);
+ gbranch(OGOTO);
+ patch(p1, pc);
+ p1 = p;
+ gopcode(OAND, nodconst((1<<t)-1), Z, nn);
+ patch(p1, pc);
+ }
+ break;
+ }
+ goto muldiv;
+
+ case OSUB:
+ if(nn != Z)
+ if(l->op == OCONST)
+ if(!typefd[n->type->etype]) {
+ cgen(r, nn);
+ gopcode(o, Z, l, nn);
+ break;
+ }
+ case OADD:
+ case OAND:
+ case OOR:
+ case OXOR:
+ case OLSHR:
+ case OASHL:
+ case OASHR:
+ /*
+ * immediate operands
+ */
+ if(nn != Z)
+ if(r->op == OCONST)
+ if(!typefd[n->type->etype]) {
+ cgen(l, nn);
+ if(r->vconst == 0)
+ if(o != OAND)
+ break;
+ if(nn != Z)
+ gopcode(o, r, Z, nn);
+ break;
+ }
+
+ case OLMUL:
+ case OLDIV:
+ case OLMOD:
+ case OMUL:
+ muldiv:
+ if(nn == Z) {
+ nullwarn(l, r);
+ break;
+ }
+ if(o == OMUL || o == OLMUL) {
+ if(mulcon(n, nn))
+ break;
+ }
+ if(l->complex >= r->complex) {
+ regalloc(&nod, l, nn);
+ cgen(l, &nod);
+ regalloc(&nod1, r, Z);
+ cgen(r, &nod1);
+ gopcode(o, &nod1, Z, &nod);
+ } else {
+ regalloc(&nod, r, nn);
+ cgen(r, &nod);
+ regalloc(&nod1, l, Z);
+ cgen(l, &nod1);
+ gopcode(o, &nod, &nod1, &nod);
+ }
+ gopcode(OAS, &nod, Z, nn);
+ regfree(&nod);
+ regfree(&nod1);
+ break;
+
+ case OASLSHR:
+ case OASASHL:
+ case OASASHR:
+ case OASAND:
+ case OASADD:
+ case OASSUB:
+ case OASXOR:
+ case OASOR:
+ if(l->op == OBIT)
+ goto asbitop;
+ if(r->op == OCONST)
+ if(!typefd[r->type->etype])
+ if(!typefd[n->type->etype]) {
+ if(l->addable < INDEXED)
+ reglcgen(&nod2, l, Z);
+ else
+ nod2 = *l;
+ regalloc(&nod, r, nn);
+ gopcode(OAS, &nod2, Z, &nod);
+ gopcode(o, r, Z, &nod);
+ gopcode(OAS, &nod, Z, &nod2);
+
+ regfree(&nod);
+ if(l->addable < INDEXED)
+ regfree(&nod2);
+ break;
+ }
+
+ case OASLMUL:
+ case OASLDIV:
+ case OASLMOD:
+ case OASMUL:
+ case OASDIV:
+ case OASMOD:
+ if(l->op == OBIT)
+ goto asbitop;
+ if(l->complex >= r->complex) {
+ if(l->addable < INDEXED)
+ reglcgen(&nod2, l, Z);
+ else
+ nod2 = *l;
+ regalloc(&nod1, r, Z);
+ cgen(r, &nod1);
+ } else {
+ regalloc(&nod1, r, Z);
+ cgen(r, &nod1);
+ if(l->addable < INDEXED)
+ reglcgen(&nod2, l, Z);
+ else
+ nod2 = *l;
+ }
+
+ regalloc(&nod, n, nn);
+ gmove(&nod2, &nod);
+ gopcode(o, &nod1, Z, &nod);
+ gmove(&nod, &nod2);
+ if(nn != Z)
+ gopcode(OAS, &nod, Z, nn);
+ regfree(&nod);
+ regfree(&nod1);
+ if(l->addable < INDEXED)
+ regfree(&nod2);
+ break;
+
+ asbitop:
+ regalloc(&nod4, n, nn);
+ if(l->complex >= r->complex) {
+ bitload(l, &nod, &nod1, &nod2, &nod4);
+ regalloc(&nod3, r, Z);
+ cgen(r, &nod3);
+ } else {
+ regalloc(&nod3, r, Z);
+ cgen(r, &nod3);
+ bitload(l, &nod, &nod1, &nod2, &nod4);
+ }
+ gmove(&nod, &nod4);
+ gopcode(o, &nod3, Z, &nod4);
+ regfree(&nod3);
+ gmove(&nod4, &nod);
+ regfree(&nod4);
+ bitstore(l, &nod, &nod1, &nod2, nn);
+ break;
+
+ case OADDR:
+ if(nn == Z) {
+ nullwarn(l, Z);
+ break;
+ }
+ lcgen(l, nn);
+ break;
+
+ case OFUNC:
+ if(l->complex >= FNX) {
+ if(l->op != OIND)
+ diag(n, "bad function call");
+
+ regret(&nod, l->left);
+ cgen(l->left, &nod);
+ regsalloc(&nod1, l->left);
+ gopcode(OAS, &nod, Z, &nod1);
+ regfree(&nod);
+
+ nod = *n;
+ nod.left = &nod2;
+ nod2 = *l;
+ nod2.left = &nod1;
+ nod2.complex = 1;
+ cgen(&nod, nn);
+
+ return;
+ }
+ if(REGARG >= 0)
+ o = reg[REGARG];
+ gargs(r, &nod, &nod1);
+ if(l->addable < INDEXED) {
+ reglcgen(&nod, l, Z);
+ gopcode(OFUNC, Z, Z, &nod);
+ regfree(&nod);
+ } else
+ gopcode(OFUNC, Z, Z, l);
+ if(REGARG >= 0)
+ if(o != reg[REGARG])
+ reg[REGARG]--;
+ if(nn != Z) {
+ regret(&nod, n);
+ gopcode(OAS, &nod, Z, nn);
+ regfree(&nod);
+ }
+ break;
+
+ case OIND:
+ if(nn == Z) {
+ nullwarn(l, Z);
+ break;
+ }
+ regialloc(&nod, n, nn);
+ r = l;
+ while(r->op == OADD)
+ r = r->right;
+ if(sconst(r) && (v = r->vconst+nod.xoffset) > -4096 && v < 4096) {
+ v = r->vconst;
+ r->vconst = 0;
+ cgen(l, &nod);
+ nod.xoffset += v;
+ r->vconst = v;
+ } else
+ cgen(l, &nod);
+ regind(&nod, n);
+ gopcode(OAS, &nod, Z, nn);
+ regfree(&nod);
+ break;
+
+ case OEQ:
+ case ONE:
+ case OLE:
+ case OLT:
+ case OGE:
+ case OGT:
+ case OLO:
+ case OLS:
+ case OHI:
+ case OHS:
+ if(nn == Z) {
+ nullwarn(l, r);
+ break;
+ }
+ boolgen(n, 1, nn);
+ break;
+
+ case OANDAND:
+ case OOROR:
+ boolgen(n, 1, nn);
+ if(nn == Z)
+ patch(p, pc);
+ break;
+
+ case ONOT:
+ if(nn == Z) {
+ nullwarn(l, Z);
+ break;
+ }
+ boolgen(n, 1, nn);
+ break;
+
+ case OCOMMA:
+ cgen(l, Z);
+ cgen(r, nn);
+ break;
+
+ case OCAST:
+ if(nn == Z) {
+ nullwarn(l, Z);
+ break;
+ }
+ /*
+ * convert from types l->n->nn
+ */
+ if(nocast(l->type, n->type)) {
+ if(nocast(n->type, nn->type)) {
+ cgen(l, nn);
+ break;
+ }
+ }
+ regalloc(&nod, l, nn);
+ cgen(l, &nod);
+ regalloc(&nod1, n, &nod);
+ if(inrel)
+ gmover(&nod, &nod1);
+ else
+ gopcode(OAS, &nod, Z, &nod1);
+ gopcode(OAS, &nod1, Z, nn);
+ regfree(&nod1);
+ regfree(&nod);
+ break;
+
+ case ODOT:
+ sugen(l, nodrat, l->type->width);
+ if(nn != Z) {
+ warn(n, "non-interruptable temporary");
+ nod = *nodrat;
+ if(!r || r->op != OCONST) {
+ diag(n, "DOT and no offset");
+ break;
+ }
+ nod.xoffset += (int32)r->vconst;
+ nod.type = n->type;
+ cgen(&nod, nn);
+ }
+ break;
+
+ case OCOND:
+ bcgen(l, 1);
+ p1 = p;
+ cgen(r->left, nn);
+ gbranch(OGOTO);
+ patch(p1, pc);
+ p1 = p;
+ cgen(r->right, nn);
+ patch(p1, pc);
+ break;
+
+ case OPOSTINC:
+ case OPOSTDEC:
+ v = 1;
+ if(l->type->etype == TIND)
+ v = l->type->link->width;
+ if(o == OPOSTDEC)
+ v = -v;
+ if(l->op == OBIT)
+ goto bitinc;
+ if(nn == Z)
+ goto pre;
+
+ if(l->addable < INDEXED)
+ reglcgen(&nod2, l, Z);
+ else
+ nod2 = *l;
+
+ regalloc(&nod, l, nn);
+ gopcode(OAS, &nod2, Z, &nod);
+ regalloc(&nod1, l, Z);
+ if(typefd[l->type->etype]) {
+ regalloc(&nod3, l, Z);
+ if(v < 0) {
+ gopcode(OAS, nodfconst(-v), Z, &nod3);
+ gopcode(OSUB, &nod3, &nod, &nod1);
+ } else {
+ gopcode(OAS, nodfconst(v), Z, &nod3);
+ gopcode(OADD, &nod3, &nod, &nod1);
+ }
+ regfree(&nod3);
+ } else
+ gopcode(OADD, nodconst(v), &nod, &nod1);
+ gopcode(OAS, &nod1, Z, &nod2);
+
+ regfree(&nod);
+ regfree(&nod1);
+ if(l->addable < INDEXED)
+ regfree(&nod2);
+ break;
+
+ case OPREINC:
+ case OPREDEC:
+ v = 1;
+ if(l->type->etype == TIND)
+ v = l->type->link->width;
+ if(o == OPREDEC)
+ v = -v;
+ if(l->op == OBIT)
+ goto bitinc;
+
+ pre:
+ if(l->addable < INDEXED)
+ reglcgen(&nod2, l, Z);
+ else
+ nod2 = *l;
+
+ regalloc(&nod, l, nn);
+ gopcode(OAS, &nod2, Z, &nod);
+ if(typefd[l->type->etype]) {
+ regalloc(&nod3, l, Z);
+ if(v < 0) {
+ gopcode(OAS, nodfconst(-v), Z, &nod3);
+ gopcode(OSUB, &nod3, Z, &nod);
+ } else {
+ gopcode(OAS, nodfconst(v), Z, &nod3);
+ gopcode(OADD, &nod3, Z, &nod);
+ }
+ regfree(&nod3);
+ } else
+ gopcode(OADD, nodconst(v), Z, &nod);
+ gopcode(OAS, &nod, Z, &nod2);
+
+ regfree(&nod);
+ if(l->addable < INDEXED)
+ regfree(&nod2);
+ break;
+
+ bitinc:
+ if(nn != Z && (o == OPOSTINC || o == OPOSTDEC)) {
+ bitload(l, &nod, &nod1, &nod2, Z);
+ gopcode(OAS, &nod, Z, nn);
+ gopcode(OADD, nodconst(v), Z, &nod);
+ bitstore(l, &nod, &nod1, &nod2, Z);
+ break;
+ }
+ bitload(l, &nod, &nod1, &nod2, nn);
+ gopcode(OADD, nodconst(v), Z, &nod);
+ bitstore(l, &nod, &nod1, &nod2, nn);
+ break;
+ }
+ cursafe = curs;
+ return;
+}
+
+void
+cgen(Node *n, Node *nn)
+{
+ _cgen(n, nn, 0);
+}
+
+void
+cgenrel(Node *n, Node *nn)
+{
+ _cgen(n, nn, 1);
+}
+
+void
+reglcgen(Node *t, Node *n, Node *nn)
+{
+ Node *r;
+ int32 v;
+
+ regialloc(t, n, nn);
+ if(n->op == OIND) {
+ r = n->left;
+ while(r->op == OADD)
+ r = r->right;
+ if(sconst(r) && (v = r->vconst+t->xoffset) > -4096 && v < 4096) {
+ v = r->vconst;
+ r->vconst = 0;
+ lcgen(n, t);
+ t->xoffset += v;
+ r->vconst = v;
+ regind(t, n);
+ return;
+ }
+ } else if(n->op == OINDREG) {
+ if((v = n->xoffset) > -4096 && v < 4096) {
+ n->op = OREGISTER;
+ cgen(n, t);
+ t->xoffset += v;
+ n->op = OINDREG;
+ regind(t, n);
+ return;
+ }
+ }
+ lcgen(n, t);
+ regind(t, n);
+}
+
+void
+reglpcgen(Node *n, Node *nn, int f)
+{
+ Type *t;
+
+ t = nn->type;
+ nn->type = types[TLONG];
+ if(f)
+ reglcgen(n, nn, Z);
+ else {
+ regialloc(n, nn, Z);
+ lcgen(nn, n);
+ regind(n, nn);
+ }
+ nn->type = t;
+}
+
+void
+lcgen(Node *n, Node *nn)
+{
+ Prog *p1;
+ Node nod;
+
+ if(debug['g']) {
+ prtree(nn, "lcgen lhs");
+ prtree(n, "lcgen");
+ }
+ if(n == Z || n->type == T)
+ return;
+ if(nn == Z) {
+ nn = &nod;
+ regalloc(&nod, n, Z);
+ }
+ switch(n->op) {
+ default:
+ if(n->addable < INDEXED) {
+ diag(n, "unknown op in lcgen: %O", n->op);
+ break;
+ }
+ nod = *n;
+ nod.op = OADDR;
+ nod.left = n;
+ nod.right = Z;
+ nod.type = types[TIND];
+ gopcode(OAS, &nod, Z, nn);
+ break;
+
+ case OCOMMA:
+ cgen(n->left, n->left);
+ lcgen(n->right, nn);
+ break;
+
+ case OIND:
+ cgen(n->left, nn);
+ break;
+
+ case OCOND:
+ bcgen(n->left, 1);
+ p1 = p;
+ lcgen(n->right->left, nn);
+ gbranch(OGOTO);
+ patch(p1, pc);
+ p1 = p;
+ lcgen(n->right->right, nn);
+ patch(p1, pc);
+ break;
+ }
+}
+
+void
+bcgen(Node *n, int true)
+{
+
+ if(n->type == T)
+ gbranch(OGOTO);
+ else
+ boolgen(n, true, Z);
+}
+
+void
+boolgen(Node *n, int true, Node *nn)
+{
+ int o;
+ Prog *p1, *p2;
+ Node *l, *r, nod, nod1;
+ int32 curs;
+
+ if(debug['g']) {
+ prtree(nn, "boolgen lhs");
+ prtree(n, "boolgen");
+ }
+ curs = cursafe;
+ l = n->left;
+ r = n->right;
+ switch(n->op) {
+
+ default:
+ regalloc(&nod, n, nn);
+ cgen(n, &nod);
+ o = ONE;
+ if(true)
+ o = comrel[relindex(o)];
+ if(typefd[n->type->etype]) {
+ gopcode(o, nodfconst(0), &nod, Z);
+ } else
+ gopcode(o, nodconst(0), &nod, Z);
+ regfree(&nod);
+ goto com;
+
+ case OCONST:
+ o = vconst(n);
+ if(!true)
+ o = !o;
+ gbranch(OGOTO);
+ if(o) {
+ p1 = p;
+ gbranch(OGOTO);
+ patch(p1, pc);
+ }
+ goto com;
+
+ case OCOMMA:
+ cgen(l, Z);
+ boolgen(r, true, nn);
+ break;
+
+ case ONOT:
+ boolgen(l, !true, nn);
+ break;
+
+ case OCOND:
+ bcgen(l, 1);
+ p1 = p;
+ bcgen(r->left, true);
+ p2 = p;
+ gbranch(OGOTO);
+ patch(p1, pc);
+ p1 = p;
+ bcgen(r->right, !true);
+ patch(p2, pc);
+ p2 = p;
+ gbranch(OGOTO);
+ patch(p1, pc);
+ patch(p2, pc);
+ goto com;
+
+ case OANDAND:
+ if(!true)
+ goto caseor;
+
+ caseand:
+ bcgen(l, true);
+ p1 = p;
+ bcgen(r, !true);
+ p2 = p;
+ patch(p1, pc);
+ gbranch(OGOTO);
+ patch(p2, pc);
+ goto com;
+
+ case OOROR:
+ if(!true)
+ goto caseand;
+
+ caseor:
+ bcgen(l, !true);
+ p1 = p;
+ bcgen(r, !true);
+ p2 = p;
+ gbranch(OGOTO);
+ patch(p1, pc);
+ patch(p2, pc);
+ goto com;
+
+ case OEQ:
+ case ONE:
+ case OLE:
+ case OLT:
+ case OGE:
+ case OGT:
+ case OHI:
+ case OHS:
+ case OLO:
+ case OLS:
+ o = n->op;
+ if(true)
+ o = comrel[relindex(o)];
+ if(l->complex >= FNX && r->complex >= FNX) {
+ regret(&nod, r);
+ cgenrel(r, &nod);
+ regsalloc(&nod1, r);
+ gopcode(OAS, &nod, Z, &nod1);
+ regfree(&nod);
+ nod = *n;
+ nod.right = &nod1;
+ boolgen(&nod, true, nn);
+ break;
+ }
+ if(sconst(l)) {
+ regalloc(&nod, r, nn);
+ cgenrel(r, &nod);
+ o = invrel[relindex(o)];
+ gopcode(o, l, &nod, Z);
+ regfree(&nod);
+ goto com;
+ }
+ if(sconst(r)) {
+ regalloc(&nod, l, nn);
+ cgenrel(l, &nod);
+ gopcode(o, r, &nod, Z);
+ regfree(&nod);
+ goto com;
+ }
+ if(l->complex >= r->complex) {
+ regalloc(&nod1, l, nn);
+ cgenrel(l, &nod1);
+ regalloc(&nod, r, Z);
+ cgenrel(r, &nod);
+ } else {
+ regalloc(&nod, r, nn);
+ cgenrel(r, &nod);
+ regalloc(&nod1, l, Z);
+ cgenrel(l, &nod1);
+ }
+ gopcode(o, &nod, &nod1, Z);
+ regfree(&nod);
+ regfree(&nod1);
+
+ com:
+ if(nn != Z) {
+ p1 = p;
+ gopcode(OAS, nodconst(1), Z, nn);
+ gbranch(OGOTO);
+ p2 = p;
+ patch(p1, pc);
+ gopcode(OAS, nodconst(0), Z, nn);
+ patch(p2, pc);
+ }
+ break;
+ }
+ cursafe = curs;
+}
+
+void
+sugen(Node *n, Node *nn, int32 w)
+{
+ Prog *p1;
+ Node nod0, nod1, nod2, nod3, nod4, *l, *r;
+ Type *t;
+ int32 pc1;
+ int i, m, c;
+
+ if(n == Z || n->type == T)
+ return;
+ if(debug['g']) {
+ prtree(nn, "sugen lhs");
+ prtree(n, "sugen");
+ }
+ if(nn == nodrat)
+ if(w > nrathole)
+ nrathole = w;
+ switch(n->op) {
+ case OIND:
+ if(nn == Z) {
+ nullwarn(n->left, Z);
+ break;
+ }
+
+ default:
+ goto copy;
+
+ case OCONST:
+ if(n->type && typev[n->type->etype]) {
+ if(nn == Z) {
+ nullwarn(n->left, Z);
+ break;
+ }
+
+ t = nn->type;
+ nn->type = types[TLONG];
+ reglcgen(&nod1, nn, Z);
+ nn->type = t;
+
+ if(isbigendian)
+ gopcode(OAS, nod32const(n->vconst>>32), Z, &nod1);
+ else
+ gopcode(OAS, nod32const(n->vconst), Z, &nod1);
+ nod1.xoffset += SZ_LONG;
+ if(isbigendian)
+ gopcode(OAS, nod32const(n->vconst), Z, &nod1);
+ else
+ gopcode(OAS, nod32const(n->vconst>>32), Z, &nod1);
+
+ regfree(&nod1);
+ break;
+ }
+ goto copy;
+
+ case ODOT:
+ l = n->left;
+ sugen(l, nodrat, l->type->width);
+ if(nn != Z) {
+ warn(n, "non-interruptable temporary");
+ nod1 = *nodrat;
+ r = n->right;
+ if(!r || r->op != OCONST) {
+ diag(n, "DOT and no offset");
+ break;
+ }
+ nod1.xoffset += (int32)r->vconst;
+ nod1.type = n->type;
+ sugen(&nod1, nn, w);
+ }
+ break;
+
+ case OSTRUCT:
+ /*
+ * rewrite so lhs has no fn call
+ */
+ if(nn != Z && nn->complex >= FNX) {
+ nod1 = *n;
+ nod1.type = typ(TIND, n->type);
+ regret(&nod2, &nod1);
+ lcgen(nn, &nod2);
+ regsalloc(&nod0, &nod1);
+ gopcode(OAS, &nod2, Z, &nod0);
+ regfree(&nod2);
+
+ nod1 = *n;
+ nod1.op = OIND;
+ nod1.left = &nod0;
+ nod1.right = Z;
+ nod1.complex = 1;
+
+ sugen(n, &nod1, w);
+ return;
+ }
+
+ r = n->left;
+ for(t = n->type->link; t != T; t = t->down) {
+ l = r;
+ if(r->op == OLIST) {
+ l = r->left;
+ r = r->right;
+ }
+ if(nn == Z) {
+ cgen(l, nn);
+ continue;
+ }
+ /*
+ * hand craft *(&nn + o) = l
+ */
+ nod0 = znode;
+ nod0.op = OAS;
+ nod0.type = t;
+ nod0.left = &nod1;
+ nod0.right = l;
+
+ nod1 = znode;
+ nod1.op = OIND;
+ nod1.type = t;
+ nod1.left = &nod2;
+
+ nod2 = znode;
+ nod2.op = OADD;
+ nod2.type = typ(TIND, t);
+ nod2.left = &nod3;
+ nod2.right = &nod4;
+
+ nod3 = znode;
+ nod3.op = OADDR;
+ nod3.type = nod2.type;
+ nod3.left = nn;
+
+ nod4 = znode;
+ nod4.op = OCONST;
+ nod4.type = nod2.type;
+ nod4.vconst = t->offset;
+
+ ccom(&nod0);
+ acom(&nod0);
+ xcom(&nod0);
+ nod0.addable = 0;
+
+ cgen(&nod0, Z);
+ }
+ break;
+
+ case OAS:
+ if(nn == Z) {
+ if(n->addable < INDEXED)
+ sugen(n->right, n->left, w);
+ break;
+ }
+ sugen(n->right, nodrat, w);
+ warn(n, "non-interruptable temporary");
+ sugen(nodrat, n->left, w);
+ sugen(nodrat, nn, w);
+ break;
+
+ case OFUNC:
+ if(nn == Z) {
+ sugen(n, nodrat, w);
+ break;
+ }
+ if(nn->op != OIND) {
+ nn = new1(OADDR, nn, Z);
+ nn->type = types[TIND];
+ nn->addable = 0;
+ } else
+ nn = nn->left;
+ n = new(OFUNC, n->left, new(OLIST, nn, n->right));
+ n->type = types[TVOID];
+ n->left->type = types[TVOID];
+ cgen(n, Z);
+ break;
+
+ case OCOND:
+ bcgen(n->left, 1);
+ p1 = p;
+ sugen(n->right->left, nn, w);
+ gbranch(OGOTO);
+ patch(p1, pc);
+ p1 = p;
+ sugen(n->right->right, nn, w);
+ patch(p1, pc);
+ break;
+
+ case OCOMMA:
+ cgen(n->left, Z);
+ sugen(n->right, nn, w);
+ break;
+ }
+ return;
+
+copy:
+ if(nn == Z)
+ return;
+ if(n->complex >= FNX && nn->complex >= FNX) {
+ t = nn->type;
+ nn->type = types[TLONG];
+ regialloc(&nod1, nn, Z);
+ lcgen(nn, &nod1);
+ regsalloc(&nod2, nn);
+ nn->type = t;
+
+ gopcode(OAS, &nod1, Z, &nod2);
+ regfree(&nod1);
+
+ nod2.type = typ(TIND, t);
+
+ nod1 = nod2;
+ nod1.op = OIND;
+ nod1.left = &nod2;
+ nod1.right = Z;
+ nod1.complex = 1;
+ nod1.type = t;
+
+ sugen(n, &nod1, w);
+ return;
+ }
+
+ w /= SZ_LONG;
+ if(w <= 2) {
+ if(n->complex > nn->complex) {
+ reglpcgen(&nod1, n, 1);
+ reglpcgen(&nod2, nn, 1);
+ } else {
+ reglpcgen(&nod2, nn, 1);
+ reglpcgen(&nod1, n, 1);
+ }
+ regalloc(&nod3, &regnode, Z);
+ regalloc(&nod4, &regnode, Z);
+ nod0 = *nodconst((1<<nod3.reg)|(1<<nod4.reg));
+ if(w == 2 && nod1.xoffset == 0)
+ gmovm(&nod1, &nod0, 0);
+ else {
+ gmove(&nod1, &nod3);
+ if(w == 2) {
+ nod1.xoffset += SZ_LONG;
+ gmove(&nod1, &nod4);
+ }
+ }
+ if(w == 2 && nod2.xoffset == 0)
+ gmovm(&nod0, &nod2, 0);
+ else {
+ gmove(&nod3, &nod2);
+ if(w == 2) {
+ nod2.xoffset += SZ_LONG;
+ gmove(&nod4, &nod2);
+ }
+ }
+ regfree(&nod1);
+ regfree(&nod2);
+ regfree(&nod3);
+ regfree(&nod4);
+ return;
+ }
+
+ if(n->complex > nn->complex) {
+ reglpcgen(&nod1, n, 0);
+ reglpcgen(&nod2, nn, 0);
+ } else {
+ reglpcgen(&nod2, nn, 0);
+ reglpcgen(&nod1, n, 0);
+ }
+
+ m = 0;
+ for(c = 0; c < w && c < 4; c++) {
+ i = tmpreg();
+ if (i == 0)
+ break;
+ reg[i]++;
+ m |= 1<<i;
+ }
+ nod4 = *(nodconst(m));
+ if(w < 3*c) {
+ for (; w>c; w-=c) {
+ gmovm(&nod1, &nod4, 1);
+ gmovm(&nod4, &nod2, 1);
+ }
+ goto out;
+ }
+
+ regalloc(&nod3, &regnode, Z);
+ gopcode(OAS, nodconst(w/c), Z, &nod3);
+ w %= c;
+
+ pc1 = pc;
+ gmovm(&nod1, &nod4, 1);
+ gmovm(&nod4, &nod2, 1);
+
+ gopcode(OSUB, nodconst(1), Z, &nod3);
+ gopcode(OEQ, nodconst(0), &nod3, Z);
+ p->as = ABGT;
+ patch(p, pc1);
+ regfree(&nod3);
+
+out:
+ if (w) {
+ i = 0;
+ while (c>w) {
+ while ((m&(1<<i)) == 0)
+ i++;
+ m &= ~(1<<i);
+ reg[i] = 0;
+ c--;
+ i++;
+ }
+ nod4.vconst = m;
+ gmovm(&nod1, &nod4, 0);
+ gmovm(&nod4, &nod2, 0);
+ }
+ i = 0;
+ do {
+ while ((m&(1<<i)) == 0)
+ i++;
+ reg[i] = 0;
+ c--;
+ i++;
+ } while (c>0);
+ regfree(&nod1);
+ regfree(&nod2);
+}
diff --git a/src/cmd/5c/doc.go b/src/cmd/5c/doc.go
new file mode 100644
index 000000000..0874293bf
--- /dev/null
+++ b/src/cmd/5c/doc.go
@@ -0,0 +1,14 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+/*
+
+5c is a version of the Plan 9 C compiler. The original is documented at
+
+ http://plan9.bell-labs.com/magic/man2html/1/2c
+
+Its target architecture is the ARM, referred to by these tools as arm.
+
+*/
+package documentation
diff --git a/src/cmd/5c/gc.h b/src/cmd/5c/gc.h
new file mode 100644
index 000000000..ff6d51916
--- /dev/null
+++ b/src/cmd/5c/gc.h
@@ -0,0 +1,384 @@
+// Inferno utils/5c/gc.h
+// http://code.google.com/p/inferno-os/source/browse/utils/5c/gc.h
+//
+// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
+// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
+// Portions Copyright © 1997-1999 Vita Nuova Limited
+// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
+// Portions Copyright © 2004,2006 Bruce Ellis
+// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
+// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
+// Portions Copyright © 2009 The Go Authors. All rights reserved.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+#include <u.h>
+#include "../cc/cc.h"
+#include "../5l/5.out.h"
+
+/*
+ * 5c/arm
+ * Arm 7500
+ */
+#define SZ_CHAR 1
+#define SZ_SHORT 2
+#define SZ_INT 4
+#define SZ_LONG 4
+#define SZ_IND 4
+#define SZ_FLOAT 4
+#define SZ_VLONG 8
+#define SZ_DOUBLE 8
+#define FNX 100
+
+typedef struct Adr Adr;
+typedef struct Prog Prog;
+typedef struct Case Case;
+typedef struct C1 C1;
+typedef struct Multab Multab;
+typedef struct Hintab Hintab;
+typedef struct Var Var;
+typedef struct Reg Reg;
+typedef struct Rgn Rgn;
+
+
+#define R0ISZERO 0
+
+struct Adr
+{
+ int32 offset;
+ int32 offset2;
+ double dval;
+ char sval[NSNAME];
+ Ieee ieee;
+
+ Sym* sym;
+ char type;
+ uchar reg;
+ char name;
+ char etype;
+};
+#define A ((Adr*)0)
+
+#define INDEXED 9
+struct Prog
+{
+ Adr from;
+ Adr to;
+ Prog* link;
+ int32 lineno;
+ char as;
+ uchar reg;
+ uchar scond;
+};
+#define P ((Prog*)0)
+
+struct Case
+{
+ Case* link;
+ int32 val;
+ int32 label;
+ char def;
+ char isv;
+};
+#define C ((Case*)0)
+
+struct C1
+{
+ int32 val;
+ int32 label;
+};
+
+struct Multab
+{
+ int32 val;
+ char code[20];
+};
+
+struct Hintab
+{
+ ushort val;
+ char hint[10];
+};
+
+struct Var
+{
+ int32 offset;
+ Sym* sym;
+ char name;
+ char etype;
+};
+
+struct Reg
+{
+ int32 pc;
+ int32 rpo; /* reverse post ordering */
+
+ Bits set;
+ Bits use1;
+ Bits use2;
+
+ Bits refbehind;
+ Bits refahead;
+ Bits calbehind;
+ Bits calahead;
+ Bits regdiff;
+ Bits act;
+
+ int32 regu;
+ int32 loop; /* could be shorter */
+
+
+ Reg* log5;
+ int32 active;
+
+ Reg* p1;
+ Reg* p2;
+ Reg* p2link;
+ Reg* s1;
+ Reg* s2;
+ Reg* link;
+ Prog* prog;
+};
+#define R ((Reg*)0)
+
+#define NRGN 600
+struct Rgn
+{
+ Reg* enter;
+ short cost;
+ short varno;
+ short regno;
+};
+
+EXTERN int32 breakpc;
+EXTERN int32 nbreak;
+EXTERN Case* cases;
+EXTERN Node constnode;
+EXTERN Node fconstnode;
+EXTERN int32 continpc;
+EXTERN int32 curarg;
+EXTERN int32 cursafe;
+EXTERN Prog* firstp;
+EXTERN int32 isbigendian;
+EXTERN Prog* lastp;
+EXTERN int32 maxargsafe;
+EXTERN int mnstring;
+EXTERN Multab multab[20];
+EXTERN int retok;
+EXTERN int hintabsize;
+EXTERN Node* nodrat;
+EXTERN Node* nodret;
+EXTERN Node* nodsafe;
+EXTERN int32 nrathole;
+EXTERN int32 nstring;
+EXTERN Prog* p;
+EXTERN int32 pc;
+EXTERN Node regnode;
+EXTERN char string[NSNAME];
+EXTERN Sym* symrathole;
+EXTERN Node znode;
+EXTERN Prog zprog;
+EXTERN char reg[NREG+NFREG];
+EXTERN int32 exregoffset;
+EXTERN int32 exfregoffset;
+EXTERN int suppress;
+
+#define BLOAD(r) band(bnot(r->refbehind), r->refahead)
+#define BSTORE(r) band(bnot(r->calbehind), r->calahead)
+#define LOAD(r) (~r->refbehind.b[z] & r->refahead.b[z])
+#define STORE(r) (~r->calbehind.b[z] & r->calahead.b[z])
+
+#define bset(a,n) ((a).b[(n)/32]&(1L<<(n)%32))
+
+#define CLOAD 4
+#define CREF 5
+#define CINF 1000
+#define LOOP 3
+
+EXTERN Rgn region[NRGN];
+EXTERN Rgn* rgp;
+EXTERN int nregion;
+EXTERN int nvar;
+
+EXTERN Bits externs;
+EXTERN Bits params;
+EXTERN Bits consts;
+EXTERN Bits addrs;
+
+EXTERN int32 regbits;
+EXTERN int32 exregbits;
+
+EXTERN int change;
+
+EXTERN Reg* firstr;
+EXTERN Reg* lastr;
+EXTERN Reg zreg;
+EXTERN Reg* freer;
+EXTERN Var var[NVAR];
+EXTERN int32* idom;
+EXTERN Reg** rpo2r;
+EXTERN int32 maxnr;
+
+extern char* anames[];
+extern Hintab hintab[];
+
+/*
+ * sgen.c
+ */
+void codgen(Node*, Node*);
+void gen(Node*);
+void noretval(int);
+void usedset(Node*, int);
+void xcom(Node*);
+int bcomplex(Node*, Node*);
+Prog* gtext(Sym*, int32);
+vlong argsize(void);
+
+/*
+ * cgen.c
+ */
+void cgen(Node*, Node*);
+void reglcgen(Node*, Node*, Node*);
+void lcgen(Node*, Node*);
+void bcgen(Node*, int);
+void boolgen(Node*, int, Node*);
+void sugen(Node*, Node*, int32);
+void layout(Node*, Node*, int, int, Node*);
+void cgenrel(Node*, Node*);
+
+/*
+ * txt.c
+ */
+void ginit(void);
+void gclean(void);
+void nextpc(void);
+void gargs(Node*, Node*, Node*);
+void garg1(Node*, Node*, Node*, int, Node**);
+Node* nodconst(int32);
+Node* nod32const(vlong);
+Node* nodfconst(double);
+void nodreg(Node*, Node*, int);
+void regret(Node*, Node*);
+int tmpreg(void);
+void regalloc(Node*, Node*, Node*);
+void regfree(Node*);
+void regialloc(Node*, Node*, Node*);
+void regsalloc(Node*, Node*);
+void regaalloc1(Node*, Node*);
+void regaalloc(Node*, Node*);
+void regind(Node*, Node*);
+void gprep(Node*, Node*);
+void raddr(Node*, Prog*);
+void naddr(Node*, Adr*);
+void gmovm(Node*, Node*, int);
+void gmove(Node*, Node*);
+void gmover(Node*, Node*);
+void gins(int a, Node*, Node*);
+void gopcode(int, Node*, Node*, Node*);
+int samaddr(Node*, Node*);
+void gbranch(int);
+void patch(Prog*, int32);
+int sconst(Node*);
+int sval(int32);
+void gpseudo(int, Sym*, Node*);
+
+/*
+ * swt.c
+ */
+int swcmp(const void*, const void*);
+void doswit(Node*);
+void swit1(C1*, int, int32, Node*);
+void cas(void);
+void bitload(Node*, Node*, Node*, Node*, Node*);
+void bitstore(Node*, Node*, Node*, Node*, Node*);
+int mulcon(Node*, Node*);
+Multab* mulcon0(int32);
+void nullwarn(Node*, Node*);
+void outcode(void);
+void ieeedtod(Ieee*, double);
+
+/*
+ * list
+ */
+void listinit(void);
+int Pconv(Fmt*);
+int Aconv(Fmt*);
+int Dconv(Fmt*);
+int Sconv(Fmt*);
+int Nconv(Fmt*);
+int Bconv(Fmt*);
+int Rconv(Fmt*);
+
+/*
+ * reg.c
+ */
+Reg* rega(void);
+int rcmp(const void*, const void*);
+void regopt(Prog*);
+void addmove(Reg*, int, int, int);
+Bits mkvar(Adr*, int);
+void prop(Reg*, Bits, Bits);
+void loopit(Reg*, int32);
+void synch(Reg*, Bits);
+uint32 allreg(uint32, Rgn*);
+void paint1(Reg*, int);
+uint32 paint2(Reg*, int);
+void paint3(Reg*, int, int32, int);
+void addreg(Adr*, int);
+
+/*
+ * peep.c
+ */
+void peep(void);
+void excise(Reg*);
+Reg* uniqp(Reg*);
+Reg* uniqs(Reg*);
+int regtyp(Adr*);
+int regzer(Adr*);
+int anyvar(Adr*);
+int subprop(Reg*);
+int copyprop(Reg*);
+int shiftprop(Reg*);
+void constprop(Adr*, Adr*, Reg*);
+int copy1(Adr*, Adr*, Reg*, int);
+int copyu(Prog*, Adr*, Adr*);
+
+int copyas(Adr*, Adr*);
+int copyau(Adr*, Adr*);
+int copyau1(Prog*, Adr*);
+int copysub(Adr*, Adr*, Adr*, int);
+int copysub1(Prog*, Adr*, Adr*, int);
+
+int32 RtoB(int);
+int32 FtoB(int);
+int BtoR(int32);
+int BtoF(int32);
+
+void predicate(void);
+int isbranch(Prog *);
+int predicable(Prog *p);
+int modifiescpsr(Prog *p);
+
+#pragma varargck type "A" int
+#pragma varargck type "B" Bits
+#pragma varargck type "D" Adr*
+#pragma varargck type "N" Adr*
+#pragma varargck type "R" Adr*
+#pragma varargck type "P" Prog*
+#pragma varargck type "S" char*
diff --git a/src/cmd/5c/list.c b/src/cmd/5c/list.c
new file mode 100644
index 000000000..ab0fae83c
--- /dev/null
+++ b/src/cmd/5c/list.c
@@ -0,0 +1,340 @@
+// Inferno utils/5c/list.c
+// http://code.google.com/p/inferno-os/source/browse/utils/5c/list.c
+//
+// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
+// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
+// Portions Copyright © 1997-1999 Vita Nuova Limited
+// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
+// Portions Copyright © 2004,2006 Bruce Ellis
+// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
+// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
+// Portions Copyright © 2009 The Go Authors. All rights reserved.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+
+#define EXTERN
+#include "gc.h"
+
+void
+listinit(void)
+{
+
+ fmtinstall('A', Aconv);
+ fmtinstall('P', Pconv);
+ fmtinstall('S', Sconv);
+ fmtinstall('N', Nconv);
+ fmtinstall('B', Bconv);
+ fmtinstall('D', Dconv);
+ fmtinstall('R', Rconv);
+}
+
+int
+Bconv(Fmt *fp)
+{
+ char str[STRINGSZ], ss[STRINGSZ], *s;
+ Bits bits;
+ int i;
+
+ str[0] = 0;
+ bits = va_arg(fp->args, Bits);
+ while(bany(&bits)) {
+ i = bnum(bits);
+ if(str[0])
+ strcat(str, " ");
+ if(var[i].sym == S) {
+ sprint(ss, "$%d", var[i].offset);
+ s = ss;
+ } else
+ s = var[i].sym->name;
+ if(strlen(str) + strlen(s) + 1 >= STRINGSZ)
+ break;
+ strcat(str, s);
+ bits.b[i/32] &= ~(1L << (i%32));
+ }
+ return fmtstrcpy(fp, str);
+}
+
+char *extra [] = {
+ ".EQ", ".NE", ".CS", ".CC",
+ ".MI", ".PL", ".VS", ".VC",
+ ".HI", ".LS", ".GE", ".LT",
+ ".GT", ".LE", "", ".NV",
+};
+
+int
+Pconv(Fmt *fp)
+{
+ char str[STRINGSZ], sc[20];
+ Prog *p;
+ int a, s;
+
+ p = va_arg(fp->args, Prog*);
+ a = p->as;
+ s = p->scond;
+ strcpy(sc, extra[s & C_SCOND]);
+ if(s & C_SBIT)
+ strcat(sc, ".S");
+ if(s & C_PBIT)
+ strcat(sc, ".P");
+ if(s & C_WBIT)
+ strcat(sc, ".W");
+ if(s & C_UBIT) /* ambiguous with FBIT */
+ strcat(sc, ".U");
+ if(a == AMOVM) {
+ if(p->from.type == D_CONST)
+ sprint(str, " %A%s %R,%D", a, sc, &p->from, &p->to);
+ else
+ if(p->to.type == D_CONST)
+ sprint(str, " %A%s %D,%R", a, sc, &p->from, &p->to);
+ else
+ sprint(str, " %A%s %D,%D", a, sc, &p->from, &p->to);
+ } else
+ if(a == ADATA)
+ sprint(str, " %A %D/%d,%D", a, &p->from, p->reg, &p->to);
+ else
+ if(p->as == ATEXT)
+ sprint(str, " %A %D,%d,%D", a, &p->from, p->reg, &p->to);
+ else
+ if(p->reg == NREG)
+ sprint(str, " %A%s %D,%D", a, sc, &p->from, &p->to);
+ else
+ if(p->from.type != D_FREG)
+ sprint(str, " %A%s %D,R%d,%D", a, sc, &p->from, p->reg, &p->to);
+ else
+ sprint(str, " %A%s %D,F%d,%D", a, sc, &p->from, p->reg, &p->to);
+ return fmtstrcpy(fp, str);
+}
+
+int
+Aconv(Fmt *fp)
+{
+ char *s;
+ int a;
+
+ a = va_arg(fp->args, int);
+ s = "???";
+ if(a >= AXXX && a < ALAST)
+ s = anames[a];
+ return fmtstrcpy(fp, s);
+}
+
+int
+Dconv(Fmt *fp)
+{
+ char str[STRINGSZ];
+ Adr *a;
+ char *op;
+ int v;
+
+ a = va_arg(fp->args, Adr*);
+ switch(a->type) {
+
+ default:
+ sprint(str, "GOK-type(%d)", a->type);
+ break;
+
+ case D_NONE:
+ str[0] = 0;
+ if(a->name != D_NONE || a->reg != NREG || a->sym != S)
+ sprint(str, "%N(R%d)(NONE)", a, a->reg);
+ break;
+
+ case D_CONST:
+ if(a->reg != NREG)
+ sprint(str, "$%N(R%d)", a, a->reg);
+ else
+ sprint(str, "$%N", a);
+ break;
+
+ case D_CONST2:
+ sprint(str, "$%d-%d", a->offset, a->offset2);
+ break;
+
+ case D_SHIFT:
+ v = a->offset;
+ op = "<<>>->@>" + (((v>>5) & 3) << 1);
+ if(v & (1<<4))
+ sprint(str, "R%d%c%cR%d", v&15, op[0], op[1], (v>>8)&15);
+ else
+ sprint(str, "R%d%c%c%d", v&15, op[0], op[1], (v>>7)&31);
+ if(a->reg != NREG)
+ sprint(str+strlen(str), "(R%d)", a->reg);
+ break;
+
+ case D_OREG:
+ if(a->reg != NREG)
+ sprint(str, "%N(R%d)", a, a->reg);
+ else
+ sprint(str, "%N", a);
+ break;
+
+ case D_REG:
+ sprint(str, "R%d", a->reg);
+ if(a->name != D_NONE || a->sym != S)
+ sprint(str, "%N(R%d)(REG)", a, a->reg);
+ break;
+
+ case D_FREG:
+ sprint(str, "F%d", a->reg);
+ if(a->name != D_NONE || a->sym != S)
+ sprint(str, "%N(R%d)(REG)", a, a->reg);
+ break;
+
+ case D_PSR:
+ sprint(str, "PSR");
+ if(a->name != D_NONE || a->sym != S)
+ sprint(str, "%N(PSR)(REG)", a);
+ break;
+
+ case D_BRANCH:
+ sprint(str, "%d(PC)", a->offset-pc);
+ break;
+
+ case D_FCONST:
+ sprint(str, "$%.17e", a->dval);
+ break;
+
+ case D_SCONST:
+ sprint(str, "$\"%S\"", a->sval);
+ break;
+ }
+ return fmtstrcpy(fp, str);
+}
+
+int
+Rconv(Fmt *fp)
+{
+ char str[STRINGSZ];
+ Adr *a;
+ int i, v;
+
+ a = va_arg(fp->args, Adr*);
+ sprint(str, "GOK-reglist");
+ switch(a->type) {
+ case D_CONST:
+ case D_CONST2:
+ if(a->reg != NREG)
+ break;
+ if(a->sym != S)
+ break;
+ v = a->offset;
+ strcpy(str, "");
+ for(i=0; i<NREG; i++) {
+ if(v & (1<<i)) {
+ if(str[0] == 0)
+ strcat(str, "[R");
+ else
+ strcat(str, ",R");
+ sprint(strchr(str, 0), "%d", i);
+ }
+ }
+ strcat(str, "]");
+ }
+ return fmtstrcpy(fp, str);
+}
+
+int
+Sconv(Fmt *fp)
+{
+ int i, c;
+ char str[STRINGSZ], *p, *a;
+
+ a = va_arg(fp->args, char*);
+ p = str;
+ for(i=0; i<NSNAME; i++) {
+ c = a[i] & 0xff;
+ if(c >= 'a' && c <= 'z' ||
+ c >= 'A' && c <= 'Z' ||
+ c >= '0' && c <= '9' ||
+ c == ' ' || c == '%') {
+ *p++ = c;
+ continue;
+ }
+ *p++ = '\\';
+ switch(c) {
+ case 0:
+ *p++ = 'z';
+ continue;
+ case '\\':
+ case '"':
+ *p++ = c;
+ continue;
+ case '\n':
+ *p++ = 'n';
+ continue;
+ case '\t':
+ *p++ = 't';
+ continue;
+ case '\r':
+ *p++ = 'r';
+ continue;
+ case '\f':
+ *p++ = 'f';
+ continue;
+ }
+ *p++ = (c>>6) + '0';
+ *p++ = ((c>>3) & 7) + '0';
+ *p++ = (c & 7) + '0';
+ }
+ *p = 0;
+ return fmtstrcpy(fp, str);
+}
+
+int
+Nconv(Fmt *fp)
+{
+ char str[STRINGSZ];
+ Adr *a;
+ Sym *s;
+
+ a = va_arg(fp->args, Adr*);
+ s = a->sym;
+ if(s == S) {
+ sprint(str, "%d", a->offset);
+ goto out;
+ }
+ switch(a->name) {
+ default:
+ sprint(str, "GOK-name(%d)", a->name);
+ break;
+
+ case D_NONE:
+ sprint(str, "%d", a->offset);
+ break;
+
+ case D_EXTERN:
+ sprint(str, "%s+%d(SB)", s->name, a->offset);
+ break;
+
+ case D_STATIC:
+ sprint(str, "%s<>+%d(SB)", s->name, a->offset);
+ break;
+
+ case D_AUTO:
+ sprint(str, "%s-%d(SP)", s->name, -a->offset);
+ break;
+
+ case D_PARAM:
+ sprint(str, "%s+%d(FP)", s->name, a->offset);
+ break;
+ }
+out:
+ return fmtstrcpy(fp, str);
+}
diff --git a/src/cmd/5c/mul.c b/src/cmd/5c/mul.c
new file mode 100644
index 000000000..ff50c4845
--- /dev/null
+++ b/src/cmd/5c/mul.c
@@ -0,0 +1,640 @@
+// Inferno utils/5c/mul.c
+// http://code.google.com/p/inferno-os/source/browse/utils/5c/mul.c
+//
+// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
+// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
+// Portions Copyright © 1997-1999 Vita Nuova Limited
+// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
+// Portions Copyright © 2004,2006 Bruce Ellis
+// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
+// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
+// Portions Copyright © 2009 The Go Authors. All rights reserved.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+
+#include "gc.h"
+
+/*
+ * code sequences for multiply by constant.
+ * [a-l][0-3]
+ * lsl $(A-'a'),r0,r1
+ * [+][0-7]
+ * add r0,r1,r2
+ * [-][0-7]
+ * sub r0,r1,r2
+ */
+
+static int maxmulops = 3; /* max # of ops to replace mul with */
+static int multabp;
+static int32 mulval;
+static char* mulcp;
+static int32 valmax;
+static int shmax;
+
+static int docode(char *hp, char *cp, int r0, int r1);
+static int gen1(int len);
+static int gen2(int len, int32 r1);
+static int gen3(int len, int32 r0, int32 r1, int flag);
+enum
+{
+ SR1 = 1<<0, /* r1 has been shifted */
+ SR0 = 1<<1, /* r0 has been shifted */
+ UR1 = 1<<2, /* r1 has not been used */
+ UR0 = 1<<3, /* r0 has not been used */
+};
+
+Multab*
+mulcon0(int32 v)
+{
+ int a1, a2, g;
+ Multab *m, *m1;
+ char hint[10];
+
+ if(v < 0)
+ v = -v;
+
+ /*
+ * look in cache
+ */
+ m = multab;
+ for(g=0; g<nelem(multab); g++) {
+ if(m->val == v) {
+ if(m->code[0] == 0)
+ return 0;
+ return m;
+ }
+ m++;
+ }
+
+ /*
+ * select a spot in cache to overwrite
+ */
+ multabp++;
+ if(multabp < 0 || multabp >= nelem(multab))
+ multabp = 0;
+ m = multab+multabp;
+ m->val = v;
+ mulval = v;
+
+ /*
+ * look in execption hint table
+ */
+ a1 = 0;
+ a2 = hintabsize;
+ for(;;) {
+ if(a1 >= a2)
+ goto no;
+ g = (a2 + a1)/2;
+ if(v < hintab[g].val) {
+ a2 = g;
+ continue;
+ }
+ if(v > hintab[g].val) {
+ a1 = g+1;
+ continue;
+ }
+ break;
+ }
+
+ if(docode(hintab[g].hint, m->code, 1, 0))
+ return m;
+ print("multiply table failure %d\n", v);
+ m->code[0] = 0;
+ return 0;
+
+no:
+ /*
+ * try to search
+ */
+ hint[0] = 0;
+ for(g=1; g<=maxmulops; g++) {
+ if(g >= maxmulops && v >= 65535)
+ break;
+ mulcp = hint+g;
+ *mulcp = 0;
+ if(gen1(g)) {
+ if(docode(hint, m->code, 1, 0))
+ return m;
+ print("multiply table failure %d\n", v);
+ break;
+ }
+ }
+
+ /*
+ * try a recur followed by a shift
+ */
+ g = 0;
+ while(!(v & 1)) {
+ g++;
+ v >>= 1;
+ }
+ if(g) {
+ m1 = mulcon0(v);
+ if(m1) {
+ strcpy(m->code, m1->code);
+ sprint(strchr(m->code, 0), "%c0", g+'a');
+ return m;
+ }
+ }
+ m->code[0] = 0;
+ return 0;
+}
+
+static int
+docode(char *hp, char *cp, int r0, int r1)
+{
+ int c, i;
+
+ c = *hp++;
+ *cp = c;
+ cp += 2;
+ switch(c) {
+ default:
+ c -= 'a';
+ if(c < 1 || c >= 30)
+ break;
+ for(i=0; i<4; i++) {
+ switch(i) {
+ case 0:
+ if(docode(hp, cp, r0<<c, r1))
+ goto out;
+ break;
+ case 1:
+ if(docode(hp, cp, r1<<c, r1))
+ goto out;
+ break;
+ case 2:
+ if(docode(hp, cp, r0, r0<<c))
+ goto out;
+ break;
+ case 3:
+ if(docode(hp, cp, r0, r1<<c))
+ goto out;
+ break;
+ }
+ }
+ break;
+
+ case '+':
+ for(i=0; i<8; i++) {
+ cp[-1] = i+'0';
+ switch(i) {
+ case 1:
+ if(docode(hp, cp, r0+r1, r1))
+ goto out;
+ break;
+ case 5:
+ if(docode(hp, cp, r0, r0+r1))
+ goto out;
+ break;
+ }
+ }
+ break;
+
+ case '-':
+ for(i=0; i<8; i++) {
+ cp[-1] = i+'0';
+ switch(i) {
+ case 1:
+ if(docode(hp, cp, r0-r1, r1))
+ goto out;
+ break;
+ case 2:
+ if(docode(hp, cp, r1-r0, r1))
+ goto out;
+ break;
+ case 5:
+ if(docode(hp, cp, r0, r0-r1))
+ goto out;
+ break;
+ case 6:
+ if(docode(hp, cp, r0, r1-r0))
+ goto out;
+ break;
+ }
+ }
+ break;
+
+ case 0:
+ if(r0 == mulval)
+ return 1;
+ }
+ return 0;
+
+out:
+ cp[-1] = i+'0';
+ return 1;
+}
+
+static int
+gen1(int len)
+{
+ int i;
+
+ for(shmax=1; shmax<30; shmax++) {
+ valmax = 1<<shmax;
+ if(valmax >= mulval)
+ break;
+ }
+ if(mulval == 1)
+ return 1;
+
+ len--;
+ for(i=1; i<=shmax; i++)
+ if(gen2(len, 1<<i)) {
+ *--mulcp = 'a'+i;
+ return 1;
+ }
+ return 0;
+}
+
+static int
+gen2(int len, int32 r1)
+{
+ int i;
+
+ if(len <= 0) {
+ if(r1 == mulval)
+ return 1;
+ return 0;
+ }
+
+ len--;
+ if(len == 0)
+ goto calcr0;
+
+ if(gen3(len, r1, r1+1, UR1)) {
+ i = '+';
+ goto out;
+ }
+ if(gen3(len, r1-1, r1, UR0)) {
+ i = '-';
+ goto out;
+ }
+ if(gen3(len, 1, r1+1, UR1)) {
+ i = '+';
+ goto out;
+ }
+ if(gen3(len, 1, r1-1, UR1)) {
+ i = '-';
+ goto out;
+ }
+
+ return 0;
+
+calcr0:
+ if(mulval == r1+1) {
+ i = '+';
+ goto out;
+ }
+ if(mulval == r1-1) {
+ i = '-';
+ goto out;
+ }
+ return 0;
+
+out:
+ *--mulcp = i;
+ return 1;
+}
+
+static int
+gen3(int len, int32 r0, int32 r1, int flag)
+{
+ int i, f1, f2;
+ int32 x;
+
+ if(r0 <= 0 ||
+ r0 >= r1 ||
+ r1 > valmax)
+ return 0;
+
+ len--;
+ if(len == 0)
+ goto calcr0;
+
+ if(!(flag & UR1)) {
+ f1 = UR1|SR1;
+ for(i=1; i<=shmax; i++) {
+ x = r0<<i;
+ if(x > valmax)
+ break;
+ if(gen3(len, r0, x, f1)) {
+ i += 'a';
+ goto out;
+ }
+ }
+ }
+
+ if(!(flag & UR0)) {
+ f1 = UR1|SR1;
+ for(i=1; i<=shmax; i++) {
+ x = r1<<i;
+ if(x > valmax)
+ break;
+ if(gen3(len, r1, x, f1)) {
+ i += 'a';
+ goto out;
+ }
+ }
+ }
+
+ if(!(flag & SR1)) {
+ f1 = UR1|SR1|(flag&UR0);
+ for(i=1; i<=shmax; i++) {
+ x = r1<<i;
+ if(x > valmax)
+ break;
+ if(gen3(len, r0, x, f1)) {
+ i += 'a';
+ goto out;
+ }
+ }
+ }
+
+ if(!(flag & SR0)) {
+ f1 = UR0|SR0|(flag&(SR1|UR1));
+
+ f2 = UR1|SR1;
+ if(flag & UR1)
+ f2 |= UR0;
+ if(flag & SR1)
+ f2 |= SR0;
+
+ for(i=1; i<=shmax; i++) {
+ x = r0<<i;
+ if(x > valmax)
+ break;
+ if(x > r1) {
+ if(gen3(len, r1, x, f2)) {
+ i += 'a';
+ goto out;
+ }
+ } else
+ if(gen3(len, x, r1, f1)) {
+ i += 'a';
+ goto out;
+ }
+ }
+ }
+
+ x = r1+r0;
+ if(gen3(len, r0, x, UR1)) {
+ i = '+';
+ goto out;
+ }
+
+ if(gen3(len, r1, x, UR1)) {
+ i = '+';
+ goto out;
+ }
+
+ x = r1-r0;
+ if(gen3(len, x, r1, UR0)) {
+ i = '-';
+ goto out;
+ }
+
+ if(x > r0) {
+ if(gen3(len, r0, x, UR1)) {
+ i = '-';
+ goto out;
+ }
+ } else
+ if(gen3(len, x, r0, UR0)) {
+ i = '-';
+ goto out;
+ }
+
+ return 0;
+
+calcr0:
+ f1 = flag & (UR0|UR1);
+ if(f1 == UR1) {
+ for(i=1; i<=shmax; i++) {
+ x = r1<<i;
+ if(x >= mulval) {
+ if(x == mulval) {
+ i += 'a';
+ goto out;
+ }
+ break;
+ }
+ }
+ }
+
+ if(mulval == r1+r0) {
+ i = '+';
+ goto out;
+ }
+ if(mulval == r1-r0) {
+ i = '-';
+ goto out;
+ }
+
+ return 0;
+
+out:
+ *--mulcp = i;
+ return 1;
+}
+
+/*
+ * hint table has numbers that
+ * the search algorithm fails on.
+ * <1000:
+ * all numbers
+ * <5000:
+ * ÷ by 5
+ * <10000:
+ * ÷ by 50
+ * <65536:
+ * ÷ by 250
+ */
+Hintab hintab[] =
+{
+ 683, "b++d+e+",
+ 687, "b+e++e-",
+ 691, "b++d+e+",
+ 731, "b++d+e+",
+ 811, "b++d+i+",
+ 821, "b++e+e+",
+ 843, "b+d++e+",
+ 851, "b+f-+e-",
+ 853, "b++e+e+",
+ 877, "c++++g-",
+ 933, "b+c++g-",
+ 981, "c-+e-d+",
+ 1375, "b+c+b+h-",
+ 1675, "d+b++h+",
+ 2425, "c++f-e+",
+ 2675, "c+d++f-",
+ 2750, "b+d-b+h-",
+ 2775, "c-+g-e-",
+ 3125, "b++e+g+",
+ 3275, "b+c+g+e+",
+ 3350, "c++++i+",
+ 3475, "c-+e-f-",
+ 3525, "c-+d+g-",
+ 3625, "c-+e-j+",
+ 3675, "b+d+d+e+",
+ 3725, "b+d-+h+",
+ 3925, "b+d+f-d-",
+ 4275, "b+g++e+",
+ 4325, "b+h-+d+",
+ 4425, "b+b+g-j-",
+ 4525, "b+d-d+f+",
+ 4675, "c++d-g+",
+ 4775, "b+d+b+g-",
+ 4825, "c+c-+i-",
+ 4850, "c++++i-",
+ 4925, "b++e-g-",
+ 4975, "c+f++e-",
+ 5500, "b+g-c+d+",
+ 6700, "d+b++i+",
+ 9700, "d++++j-",
+ 11000, "b+f-c-h-",
+ 11750, "b+d+g+j-",
+ 12500, "b+c+e-k+",
+ 13250, "b+d+e-f+",
+ 13750, "b+h-c-d+",
+ 14250, "b+g-c+e-",
+ 14500, "c+f+j-d-",
+ 14750, "d-g--f+",
+ 16750, "b+e-d-n+",
+ 17750, "c+h-b+e+",
+ 18250, "d+b+h-d+",
+ 18750, "b+g-++f+",
+ 19250, "b+e+b+h+",
+ 19750, "b++h--f-",
+ 20250, "b+e-l-c+",
+ 20750, "c++bi+e-",
+ 21250, "b+i+l+c+",
+ 22000, "b+e+d-g-",
+ 22250, "b+d-h+k-",
+ 22750, "b+d-e-g+",
+ 23250, "b+c+h+e-",
+ 23500, "b+g-c-g-",
+ 23750, "b+g-b+h-",
+ 24250, "c++g+m-",
+ 24750, "b+e+e+j-",
+ 25000, "b++dh+g+",
+ 25250, "b+e+d-g-",
+ 25750, "b+e+b+j+",
+ 26250, "b+h+c+e+",
+ 26500, "b+h+c+g+",
+ 26750, "b+d+e+g-",
+ 27250, "b+e+e+f+",
+ 27500, "c-i-c-d+",
+ 27750, "b+bd++j+",
+ 28250, "d-d-++i-",
+ 28500, "c+c-h-e-",
+ 29000, "b+g-d-f+",
+ 29500, "c+h+++e-",
+ 29750, "b+g+f-c+",
+ 30250, "b+f-g-c+",
+ 33500, "c-f-d-n+",
+ 33750, "b+d-b+j-",
+ 34250, "c+e+++i+",
+ 35250, "e+b+d+k+",
+ 35500, "c+e+d-g-",
+ 35750, "c+i-++e+",
+ 36250, "b+bh-d+e+",
+ 36500, "c+c-h-e-",
+ 36750, "d+e--i+",
+ 37250, "b+g+g+b+",
+ 37500, "b+h-b+f+",
+ 37750, "c+be++j-",
+ 38500, "b+e+b+i+",
+ 38750, "d+i-b+d+",
+ 39250, "b+g-l-+d+",
+ 39500, "b+g-c+g-",
+ 39750, "b+bh-c+f-",
+ 40250, "b+bf+d+g-",
+ 40500, "b+g-c+g+",
+ 40750, "c+b+i-e+",
+ 41250, "d++bf+h+",
+ 41500, "b+j+c+d-",
+ 41750, "c+f+b+h-",
+ 42500, "c+h++g+",
+ 42750, "b+g+d-f-",
+ 43250, "b+l-e+d-",
+ 43750, "c+bd+h+f-",
+ 44000, "b+f+g-d-",
+ 44250, "b+d-g--f+",
+ 44500, "c+e+c+h+",
+ 44750, "b+e+d-h-",
+ 45250, "b++g+j-g+",
+ 45500, "c+d+e-g+",
+ 45750, "b+d-h-e-",
+ 46250, "c+bd++j+",
+ 46500, "b+d-c-j-",
+ 46750, "e-e-b+g-",
+ 47000, "b+c+d-j-",
+ 47250, "b+e+e-g-",
+ 47500, "b+g-c-h-",
+ 47750, "b+f-c+h-",
+ 48250, "d--h+n-",
+ 48500, "b+c-g+m-",
+ 48750, "b+e+e-g+",
+ 49500, "c-f+e+j-",
+ 49750, "c+c+g++f-",
+ 50000, "b+e+e+k+",
+ 50250, "b++i++g+",
+ 50500, "c+g+f-i+",
+ 50750, "b+e+d+k-",
+ 51500, "b+i+c-f+",
+ 51750, "b+bd+g-e-",
+ 52250, "b+d+g-j+",
+ 52500, "c+c+f+g+",
+ 52750, "b+c+e+i+",
+ 53000, "b+i+c+g+",
+ 53500, "c+g+g-n+",
+ 53750, "b+j+d-c+",
+ 54250, "b+d-g-j-",
+ 54500, "c-f+e+f+",
+ 54750, "b+f-+c+g+",
+ 55000, "b+g-d-g-",
+ 55250, "b+e+e+g+",
+ 55500, "b+cd++j+",
+ 55750, "b+bh-d-f-",
+ 56250, "c+d-b+j-",
+ 56500, "c+d+c+i+",
+ 56750, "b+e+d++h-",
+ 57000, "b+d+g-f+",
+ 57250, "b+f-m+d-",
+ 57750, "b+i+c+e-",
+ 58000, "b+e+d+h+",
+ 58250, "c+b+g+g+",
+ 58750, "d-e-j--e+",
+ 59000, "d-i-+e+",
+ 59250, "e--h-m+",
+ 59500, "c+c-h+f-",
+ 59750, "b+bh-e+i-",
+ 60250, "b+bh-e-e-",
+ 60500, "c+c-g-g-",
+ 60750, "b+e-l-e-",
+ 61250, "b+g-g-c+",
+ 61750, "b+g-c+g+",
+ 62250, "f--+c-i-",
+ 62750, "e+f--+g+",
+ 64750, "b+f+d+p-",
+};
+int hintabsize = nelem(hintab);
diff --git a/src/cmd/5c/peep.c b/src/cmd/5c/peep.c
new file mode 100644
index 000000000..3a905f099
--- /dev/null
+++ b/src/cmd/5c/peep.c
@@ -0,0 +1,1468 @@
+// Inferno utils/5c/peep.c
+// http://code.google.com/p/inferno-os/source/browse/utils/5c/peep.c
+//
+// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
+// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
+// Portions Copyright © 1997-1999 Vita Nuova Limited
+// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
+// Portions Copyright © 2004,2006 Bruce Ellis
+// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
+// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
+// Portions Copyright © 2009 The Go Authors. All rights reserved.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+
+#include "gc.h"
+
+int xtramodes(Reg*, Adr*);
+
+void
+peep(void)
+{
+ Reg *r, *r1, *r2;
+ Prog *p, *p1;
+ int t;
+/*
+ * complete R structure
+ */
+ t = 0;
+ for(r=firstr; r!=R; r=r1) {
+ r1 = r->link;
+ if(r1 == R)
+ break;
+ p = r->prog->link;
+ while(p != r1->prog)
+ switch(p->as) {
+ default:
+ r2 = rega();
+ r->link = r2;
+ r2->link = r1;
+
+ r2->prog = p;
+ r2->p1 = r;
+ r->s1 = r2;
+ r2->s1 = r1;
+ r1->p1 = r2;
+
+ r = r2;
+ t++;
+
+ case ADATA:
+ case AGLOBL:
+ case ANAME:
+ case ASIGNAME:
+ p = p->link;
+ }
+ }
+
+loop1:
+ t = 0;
+ for(r=firstr; r!=R; r=r->link) {
+ p = r->prog;
+ if(p->as == ASLL || p->as == ASRL || p->as == ASRA) {
+ /*
+ * elide shift into D_SHIFT operand of subsequent instruction
+ */
+ if(shiftprop(r)) {
+ excise(r);
+ t++;
+ }
+ }
+ if(p->as == AMOVW || p->as == AMOVF || p->as == AMOVD)
+ if(regtyp(&p->to)) {
+ if(p->from.type == D_CONST)
+ constprop(&p->from, &p->to, r->s1);
+ else if(regtyp(&p->from))
+ if(p->from.type == p->to.type) {
+ if(copyprop(r)) {
+ excise(r);
+ t++;
+ } else
+ if(subprop(r) && copyprop(r)) {
+ excise(r);
+ t++;
+ }
+ }
+ }
+ }
+ if(t)
+ goto loop1;
+ /*
+ * look for MOVB x,R; MOVB R,R
+ */
+ for(r=firstr; r!=R; r=r->link) {
+ p = r->prog;
+ switch(p->as) {
+ default:
+ continue;
+ case AEOR:
+ /*
+ * EOR -1,x,y => MVN x,y
+ */
+ if(p->from.type == D_CONST && p->from.offset == -1) {
+ p->as = AMVN;
+ p->from.type = D_REG;
+ if(p->reg != NREG)
+ p->from.reg = p->reg;
+ else
+ p->from.reg = p->to.reg;
+ p->reg = NREG;
+ }
+ continue;
+ case AMOVH:
+ case AMOVHU:
+ case AMOVB:
+ case AMOVBU:
+ if(p->to.type != D_REG)
+ continue;
+ break;
+ }
+ r1 = r->link;
+ if(r1 == R)
+ continue;
+ p1 = r1->prog;
+ if(p1->as != p->as)
+ continue;
+ if(p1->from.type != D_REG || p1->from.reg != p->to.reg)
+ continue;
+ if(p1->to.type != D_REG || p1->to.reg != p->to.reg)
+ continue;
+ excise(r1);
+ }
+
+ for(r=firstr; r!=R; r=r->link) {
+ p = r->prog;
+ switch(p->as) {
+ case AMOVW:
+ case AMOVB:
+ case AMOVBU:
+ if(p->from.type == D_OREG && p->from.offset == 0)
+ xtramodes(r, &p->from);
+ else if(p->to.type == D_OREG && p->to.offset == 0)
+ xtramodes(r, &p->to);
+ else
+ continue;
+ break;
+ case ACMP:
+ /*
+ * elide CMP $0,x if calculation of x can set condition codes
+ */
+ if(p->from.type != D_CONST || p->from.offset != 0)
+ continue;
+ r2 = r->s1;
+ if(r2 == R)
+ continue;
+ t = r2->prog->as;
+ switch(t) {
+ default:
+ continue;
+ case ABEQ:
+ case ABNE:
+ case ABMI:
+ case ABPL:
+ break;
+ case ABGE:
+ t = ABPL;
+ break;
+ case ABLT:
+ t = ABMI;
+ break;
+ case ABHI:
+ t = ABNE;
+ break;
+ case ABLS:
+ t = ABEQ;
+ break;
+ }
+ r1 = r;
+ do
+ r1 = uniqp(r1);
+ while (r1 != R && r1->prog->as == ANOP);
+ if(r1 == R)
+ continue;
+ p1 = r1->prog;
+ if(p1->to.type != D_REG)
+ continue;
+ if(p1->to.reg != p->reg)
+ if(!(p1->as == AMOVW && p1->from.type == D_REG && p1->from.reg == p->reg))
+ continue;
+ switch(p1->as) {
+ default:
+ continue;
+ case AMOVW:
+ if(p1->from.type != D_REG)
+ continue;
+ case AAND:
+ case AEOR:
+ case AORR:
+ case ABIC:
+ case AMVN:
+ case ASUB:
+ case ARSB:
+ case AADD:
+ case AADC:
+ case ASBC:
+ case ARSC:
+ break;
+ }
+ p1->scond |= C_SBIT;
+ r2->prog->as = t;
+ excise(r);
+ continue;
+ }
+ }
+
+ predicate();
+}
+
+void
+excise(Reg *r)
+{
+ Prog *p;
+
+ p = r->prog;
+ p->as = ANOP;
+ p->scond = zprog.scond;
+ p->from = zprog.from;
+ p->to = zprog.to;
+ p->reg = zprog.reg; /**/
+}
+
+Reg*
+uniqp(Reg *r)
+{
+ Reg *r1;
+
+ r1 = r->p1;
+ if(r1 == R) {
+ r1 = r->p2;
+ if(r1 == R || r1->p2link != R)
+ return R;
+ } else
+ if(r->p2 != R)
+ return R;
+ return r1;
+}
+
+Reg*
+uniqs(Reg *r)
+{
+ Reg *r1;
+
+ r1 = r->s1;
+ if(r1 == R) {
+ r1 = r->s2;
+ if(r1 == R)
+ return R;
+ } else
+ if(r->s2 != R)
+ return R;
+ return r1;
+}
+
+int
+regtyp(Adr *a)
+{
+
+ if(a->type == D_REG)
+ return 1;
+ if(a->type == D_FREG)
+ return 1;
+ return 0;
+}
+
+/*
+ * the idea is to substitute
+ * one register for another
+ * from one MOV to another
+ * MOV a, R0
+ * ADD b, R0 / no use of R1
+ * MOV R0, R1
+ * would be converted to
+ * MOV a, R1
+ * ADD b, R1
+ * MOV R1, R0
+ * hopefully, then the former or latter MOV
+ * will be eliminated by copy propagation.
+ */
+int
+subprop(Reg *r0)
+{
+ Prog *p;
+ Adr *v1, *v2;
+ Reg *r;
+ int t;
+
+ p = r0->prog;
+ v1 = &p->from;
+ if(!regtyp(v1))
+ return 0;
+ v2 = &p->to;
+ if(!regtyp(v2))
+ return 0;
+ for(r=uniqp(r0); r!=R; r=uniqp(r)) {
+ if(uniqs(r) == R)
+ break;
+ p = r->prog;
+ switch(p->as) {
+ case ABL:
+ return 0;
+
+ case ACMP:
+ case ACMN:
+ case AADD:
+ case ASUB:
+ case ARSB:
+ case ASLL:
+ case ASRL:
+ case ASRA:
+ case AORR:
+ case AAND:
+ case AEOR:
+ case AMUL:
+ case ADIV:
+ case ADIVU:
+
+ case ACMPF:
+ case ACMPD:
+ case AADDD:
+ case AADDF:
+ case ASUBD:
+ case ASUBF:
+ case AMULD:
+ case AMULF:
+ case ADIVD:
+ case ADIVF:
+ if(p->to.type == v1->type)
+ if(p->to.reg == v1->reg) {
+ if(p->reg == NREG)
+ p->reg = p->to.reg;
+ goto gotit;
+ }
+ break;
+
+ case AMOVF:
+ case AMOVD:
+ case AMOVW:
+ if(p->to.type == v1->type)
+ if(p->to.reg == v1->reg)
+ goto gotit;
+ break;
+
+ case AMOVM:
+ t = 1<<v2->reg;
+ if((p->from.type == D_CONST && (p->from.offset&t)) ||
+ (p->to.type == D_CONST && (p->to.offset&t)))
+ return 0;
+ break;
+ }
+ if(copyau(&p->from, v2) ||
+ copyau1(p, v2) ||
+ copyau(&p->to, v2))
+ break;
+ if(copysub(&p->from, v1, v2, 0) ||
+ copysub1(p, v1, v2, 0) ||
+ copysub(&p->to, v1, v2, 0))
+ break;
+ }
+ return 0;
+
+gotit:
+ copysub(&p->to, v1, v2, 1);
+ if(debug['P']) {
+ print("gotit: %D->%D\n%P", v1, v2, r->prog);
+ if(p->from.type == v2->type)
+ print(" excise");
+ print("\n");
+ }
+ for(r=uniqs(r); r!=r0; r=uniqs(r)) {
+ p = r->prog;
+ copysub(&p->from, v1, v2, 1);
+ copysub1(p, v1, v2, 1);
+ copysub(&p->to, v1, v2, 1);
+ if(debug['P'])
+ print("%P\n", r->prog);
+ }
+ t = v1->reg;
+ v1->reg = v2->reg;
+ v2->reg = t;
+ if(debug['P'])
+ print("%P last\n", r->prog);
+ return 1;
+}
+
+/*
+ * The idea is to remove redundant copies.
+ * v1->v2 F=0
+ * (use v2 s/v2/v1/)*
+ * set v1 F=1
+ * use v2 return fail
+ * -----------------
+ * v1->v2 F=0
+ * (use v2 s/v2/v1/)*
+ * set v1 F=1
+ * set v2 return success
+ */
+int
+copyprop(Reg *r0)
+{
+ Prog *p;
+ Adr *v1, *v2;
+ Reg *r;
+
+ p = r0->prog;
+ v1 = &p->from;
+ v2 = &p->to;
+ if(copyas(v1, v2))
+ return 1;
+ for(r=firstr; r!=R; r=r->link)
+ r->active = 0;
+ return copy1(v1, v2, r0->s1, 0);
+}
+
+int
+copy1(Adr *v1, Adr *v2, Reg *r, int f)
+{
+ int t;
+ Prog *p;
+
+ if(r->active) {
+ if(debug['P'])
+ print("act set; return 1\n");
+ return 1;
+ }
+ r->active = 1;
+ if(debug['P'])
+ print("copy %D->%D f=%d\n", v1, v2, f);
+ for(; r != R; r = r->s1) {
+ p = r->prog;
+ if(debug['P'])
+ print("%P", p);
+ if(!f && uniqp(r) == R) {
+ f = 1;
+ if(debug['P'])
+ print("; merge; f=%d", f);
+ }
+ t = copyu(p, v2, A);
+ switch(t) {
+ case 2: /* rar, cant split */
+ if(debug['P'])
+ print("; %Drar; return 0\n", v2);
+ return 0;
+
+ case 3: /* set */
+ if(debug['P'])
+ print("; %Dset; return 1\n", v2);
+ return 1;
+
+ case 1: /* used, substitute */
+ case 4: /* use and set */
+ if(f) {
+ if(!debug['P'])
+ return 0;
+ if(t == 4)
+ print("; %Dused+set and f=%d; return 0\n", v2, f);
+ else
+ print("; %Dused and f=%d; return 0\n", v2, f);
+ return 0;
+ }
+ if(copyu(p, v2, v1)) {
+ if(debug['P'])
+ print("; sub fail; return 0\n");
+ return 0;
+ }
+ if(debug['P'])
+ print("; sub%D/%D", v2, v1);
+ if(t == 4) {
+ if(debug['P'])
+ print("; %Dused+set; return 1\n", v2);
+ return 1;
+ }
+ break;
+ }
+ if(!f) {
+ t = copyu(p, v1, A);
+ if(!f && (t == 2 || t == 3 || t == 4)) {
+ f = 1;
+ if(debug['P'])
+ print("; %Dset and !f; f=%d", v1, f);
+ }
+ }
+ if(debug['P'])
+ print("\n");
+ if(r->s2)
+ if(!copy1(v1, v2, r->s2, f))
+ return 0;
+ }
+ return 1;
+}
+
+/*
+ * The idea is to remove redundant constants.
+ * $c1->v1
+ * ($c1->v2 s/$c1/v1)*
+ * set v1 return
+ * The v1->v2 should be eliminated by copy propagation.
+ */
+void
+constprop(Adr *c1, Adr *v1, Reg *r)
+{
+ Prog *p;
+
+ if(debug['C'])
+ print("constprop %D->%D\n", c1, v1);
+ for(; r != R; r = r->s1) {
+ p = r->prog;
+ if(debug['C'])
+ print("%P", p);
+ if(uniqp(r) == R) {
+ if(debug['C'])
+ print("; merge; return\n");
+ return;
+ }
+ if(p->as == AMOVW && copyas(&p->from, c1)) {
+ if(debug['C'])
+ print("; sub%D/%D", &p->from, v1);
+ p->from = *v1;
+ } else if(copyu(p, v1, A) > 1) {
+ if(debug['C'])
+ print("; %Dset; return\n", v1);
+ return;
+ }
+ if(debug['C'])
+ print("\n");
+ if(r->s2)
+ constprop(c1, v1, r->s2);
+ }
+}
+
+/*
+ * ASLL x,y,w
+ * .. (not use w, not set x y w)
+ * AXXX w,a,b (a != w)
+ * .. (not use w)
+ * (set w)
+ * ----------- changed to
+ * ..
+ * AXXX (x<<y),a,b
+ * ..
+ */
+#define FAIL(msg) { if(debug['H']) print("\t%s; FAILURE\n", msg); return 0; }
+int
+shiftprop(Reg *r)
+{
+ Reg *r1;
+ Prog *p, *p1, *p2;
+ int n, o;
+ Adr a;
+
+ p = r->prog;
+ if(p->to.type != D_REG)
+ FAIL("BOTCH: result not reg");
+ n = p->to.reg;
+ a = zprog.from;
+ if(p->reg != NREG && p->reg != p->to.reg) {
+ a.type = D_REG;
+ a.reg = p->reg;
+ }
+ if(debug['H'])
+ print("shiftprop\n%P", p);
+ r1 = r;
+ for(;;) {
+ /* find first use of shift result; abort if shift operands or result are changed */
+ r1 = uniqs(r1);
+ if(r1 == R)
+ FAIL("branch");
+ if(uniqp(r1) == R)
+ FAIL("merge");
+ p1 = r1->prog;
+ if(debug['H'])
+ print("\n%P", p1);
+ switch(copyu(p1, &p->to, A)) {
+ case 0: /* not used or set */
+ if((p->from.type == D_REG && copyu(p1, &p->from, A) > 1) ||
+ (a.type == D_REG && copyu(p1, &a, A) > 1))
+ FAIL("args modified");
+ continue;
+ case 3: /* set, not used */
+ FAIL("BOTCH: noref");
+ }
+ break;
+ }
+ /* check whether substitution can be done */
+ switch(p1->as) {
+ default:
+ FAIL("non-dpi");
+ case AAND:
+ case AEOR:
+ case AADD:
+ case AADC:
+ case AORR:
+ case ASUB:
+ case ARSB:
+ case ASBC:
+ case ARSC:
+ if(p1->reg == n || (p1->reg == NREG && p1->to.type == D_REG && p1->to.reg == n)) {
+ if(p1->from.type != D_REG)
+ FAIL("can't swap");
+ p1->reg = p1->from.reg;
+ p1->from.reg = n;
+ switch(p1->as) {
+ case ASUB:
+ p1->as = ARSB;
+ break;
+ case ARSB:
+ p1->as = ASUB;
+ break;
+ case ASBC:
+ p1->as = ARSC;
+ break;
+ case ARSC:
+ p1->as = ASBC;
+ break;
+ }
+ if(debug['H'])
+ print("\t=>%P", p1);
+ }
+ case ABIC:
+ case ACMP:
+ case ACMN:
+ if(p1->reg == n)
+ FAIL("can't swap");
+ if(p1->reg == NREG && p1->to.reg == n)
+ FAIL("shift result used twice");
+ case AMVN:
+ if(p1->from.type == D_SHIFT)
+ FAIL("shift result used in shift");
+ if(p1->from.type != D_REG || p1->from.reg != n)
+ FAIL("BOTCH: where is it used?");
+ break;
+ }
+ /* check whether shift result is used subsequently */
+ p2 = p1;
+ if(p1->to.reg != n)
+ for (;;) {
+ r1 = uniqs(r1);
+ if(r1 == R)
+ FAIL("inconclusive");
+ p1 = r1->prog;
+ if(debug['H'])
+ print("\n%P", p1);
+ switch(copyu(p1, &p->to, A)) {
+ case 0: /* not used or set */
+ continue;
+ case 3: /* set, not used */
+ break;
+ default:/* used */
+ FAIL("reused");
+ }
+ break;
+ }
+ /* make the substitution */
+ p2->from.type = D_SHIFT;
+ p2->from.reg = NREG;
+ o = p->reg;
+ if(o == NREG)
+ o = p->to.reg;
+ switch(p->from.type){
+ case D_CONST:
+ o |= (p->from.offset&0x1f)<<7;
+ break;
+ case D_REG:
+ o |= (1<<4) | (p->from.reg<<8);
+ break;
+ }
+ switch(p->as){
+ case ASLL:
+ o |= 0<<5;
+ break;
+ case ASRL:
+ o |= 1<<5;
+ break;
+ case ASRA:
+ o |= 2<<5;
+ break;
+ }
+ p2->from.offset = o;
+ if(debug['H'])
+ print("\t=>%P\tSUCCEED\n", p2);
+ return 1;
+}
+
+Reg*
+findpre(Reg *r, Adr *v)
+{
+ Reg *r1;
+
+ for(r1=uniqp(r); r1!=R; r=r1,r1=uniqp(r)) {
+ if(uniqs(r1) != r)
+ return R;
+ switch(copyu(r1->prog, v, A)) {
+ case 1: /* used */
+ case 2: /* read-alter-rewrite */
+ return R;
+ case 3: /* set */
+ case 4: /* set and used */
+ return r1;
+ }
+ }
+ return R;
+}
+
+Reg*
+findinc(Reg *r, Reg *r2, Adr *v)
+{
+ Reg *r1;
+ Prog *p;
+
+
+ for(r1=uniqs(r); r1!=R && r1!=r2; r=r1,r1=uniqs(r)) {
+ if(uniqp(r1) != r)
+ return R;
+ switch(copyu(r1->prog, v, A)) {
+ case 0: /* not touched */
+ continue;
+ case 4: /* set and used */
+ p = r1->prog;
+ if(p->as == AADD)
+ if(p->from.type == D_CONST)
+ if(p->from.offset > -4096 && p->from.offset < 4096)
+ return r1;
+ default:
+ return R;
+ }
+ }
+ return R;
+}
+
+int
+nochange(Reg *r, Reg *r2, Prog *p)
+{
+ Adr a[3];
+ int i, n;
+
+ if(r == r2)
+ return 1;
+ n = 0;
+ if(p->reg != NREG && p->reg != p->to.reg) {
+ a[n].type = D_REG;
+ a[n++].reg = p->reg;
+ }
+ switch(p->from.type) {
+ case D_SHIFT:
+ a[n].type = D_REG;
+ a[n++].reg = p->from.offset&0xf;
+ case D_REG:
+ a[n].type = D_REG;
+ a[n++].reg = p->from.reg;
+ }
+ if(n == 0)
+ return 1;
+ for(; r!=R && r!=r2; r=uniqs(r)) {
+ p = r->prog;
+ for(i=0; i<n; i++)
+ if(copyu(p, &a[i], A) > 1)
+ return 0;
+ }
+ return 1;
+}
+
+int
+findu1(Reg *r, Adr *v)
+{
+ for(; r != R; r = r->s1) {
+ if(r->active)
+ return 0;
+ r->active = 1;
+ switch(copyu(r->prog, v, A)) {
+ case 1: /* used */
+ case 2: /* read-alter-rewrite */
+ case 4: /* set and used */
+ return 1;
+ case 3: /* set */
+ return 0;
+ }
+ if(r->s2)
+ if (findu1(r->s2, v))
+ return 1;
+ }
+ return 0;
+}
+
+int
+finduse(Reg *r, Adr *v)
+{
+ Reg *r1;
+
+ for(r1=firstr; r1!=R; r1=r1->link)
+ r1->active = 0;
+ return findu1(r, v);
+}
+
+int
+xtramodes(Reg *r, Adr *a)
+{
+ Reg *r1, *r2, *r3;
+ Prog *p, *p1;
+ Adr v;
+
+ p = r->prog;
+ if(debug['h'] && p->as == AMOVB && p->from.type == D_OREG) /* byte load */
+ return 0;
+ v = *a;
+ v.type = D_REG;
+ r1 = findpre(r, &v);
+ if(r1 != R) {
+ p1 = r1->prog;
+ if(p1->to.type == D_REG && p1->to.reg == v.reg)
+ switch(p1->as) {
+ case AADD:
+ if(p1->from.type == D_REG ||
+ (p1->from.type == D_SHIFT && (p1->from.offset&(1<<4)) == 0 &&
+ (p->as != AMOVB || (a == &p->from && (p1->from.offset&~0xf) == 0))) ||
+ (p1->from.type == D_CONST &&
+ p1->from.offset > -4096 && p1->from.offset < 4096))
+ if(nochange(uniqs(r1), r, p1)) {
+ if(a != &p->from || v.reg != p->to.reg)
+ if (finduse(r->s1, &v)) {
+ if(p1->reg == NREG || p1->reg == v.reg)
+ /* pre-indexing */
+ p->scond |= C_WBIT;
+ else return 0;
+ }
+ switch (p1->from.type) {
+ case D_REG:
+ /* register offset */
+ a->type = D_SHIFT;
+ a->offset = p1->from.reg;
+ break;
+ case D_SHIFT:
+ /* scaled register offset */
+ a->type = D_SHIFT;
+ case D_CONST:
+ /* immediate offset */
+ a->offset = p1->from.offset;
+ break;
+ }
+ if(p1->reg != NREG)
+ a->reg = p1->reg;
+ excise(r1);
+ return 1;
+ }
+ break;
+ case AMOVW:
+ if(p1->from.type == D_REG)
+ if((r2 = findinc(r1, r, &p1->from)) != R) {
+ for(r3=uniqs(r2); r3->prog->as==ANOP; r3=uniqs(r3))
+ ;
+ if(r3 == r) {
+ /* post-indexing */
+ p1 = r2->prog;
+ a->reg = p1->to.reg;
+ a->offset = p1->from.offset;
+ p->scond |= C_PBIT;
+ if(!finduse(r, &r1->prog->to))
+ excise(r1);
+ excise(r2);
+ return 1;
+ }
+ }
+ break;
+ }
+ }
+ if(a != &p->from || a->reg != p->to.reg)
+ if((r1 = findinc(r, R, &v)) != R) {
+ /* post-indexing */
+ p1 = r1->prog;
+ a->offset = p1->from.offset;
+ p->scond |= C_PBIT;
+ excise(r1);
+ return 1;
+ }
+ return 0;
+}
+
+/*
+ * return
+ * 1 if v only used (and substitute),
+ * 2 if read-alter-rewrite
+ * 3 if set
+ * 4 if set and used
+ * 0 otherwise (not touched)
+ */
+int
+copyu(Prog *p, Adr *v, Adr *s)
+{
+
+ switch(p->as) {
+
+ default:
+ if(debug['P'])
+ print(" (?)");
+ return 2;
+
+ case AMOVM:
+ if(v->type != D_REG)
+ return 0;
+ if(p->from.type == D_CONST) { /* read reglist, read/rar */
+ if(s != A) {
+ if(p->from.offset&(1<<v->reg))
+ return 1;
+ if(copysub(&p->to, v, s, 1))
+ return 1;
+ return 0;
+ }
+ if(copyau(&p->to, v)) {
+ if(p->scond&C_WBIT)
+ return 2;
+ return 1;
+ }
+ if(p->from.offset&(1<<v->reg))
+ return 1;
+ } else { /* read/rar, write reglist */
+ if(s != A) {
+ if(p->to.offset&(1<<v->reg))
+ return 1;
+ if(copysub(&p->from, v, s, 1))
+ return 1;
+ return 0;
+ }
+ if(copyau(&p->from, v)) {
+ if(p->scond&C_WBIT)
+ return 2;
+ if(p->to.offset&(1<<v->reg))
+ return 4;
+ return 1;
+ }
+ if(p->to.offset&(1<<v->reg))
+ return 3;
+ }
+ return 0;
+
+ case ANOP: /* read, write */
+ case AMOVW:
+ case AMOVF:
+ case AMOVD:
+ case AMOVH:
+ case AMOVHU:
+ case AMOVB:
+ case AMOVBU:
+ case AMOVDW:
+ case AMOVWD:
+ case AMOVFD:
+ case AMOVDF:
+ if(p->scond&(C_WBIT|C_PBIT))
+ if(v->type == D_REG) {
+ if(p->from.type == D_OREG || p->from.type == D_SHIFT) {
+ if(p->from.reg == v->reg)
+ return 2;
+ } else {
+ if(p->to.reg == v->reg)
+ return 2;
+ }
+ }
+ if(s != A) {
+ if(copysub(&p->from, v, s, 1))
+ return 1;
+ if(!copyas(&p->to, v))
+ if(copysub(&p->to, v, s, 1))
+ return 1;
+ return 0;
+ }
+ if(copyas(&p->to, v)) {
+ if(copyau(&p->from, v))
+ return 4;
+ return 3;
+ }
+ if(copyau(&p->from, v))
+ return 1;
+ if(copyau(&p->to, v))
+ return 1;
+ return 0;
+
+
+ case AADD: /* read, read, write */
+ case ASUB:
+ case ARSB:
+ case ASLL:
+ case ASRL:
+ case ASRA:
+ case AORR:
+ case AAND:
+ case AEOR:
+ case AMUL:
+ case ADIV:
+ case ADIVU:
+ case AADDF:
+ case AADDD:
+ case ASUBF:
+ case ASUBD:
+ case AMULF:
+ case AMULD:
+ case ADIVF:
+ case ADIVD:
+
+ case ACMPF:
+ case ACMPD:
+ case ACMP:
+ case ACMN:
+ case ACASE:
+ if(s != A) {
+ if(copysub(&p->from, v, s, 1))
+ return 1;
+ if(copysub1(p, v, s, 1))
+ return 1;
+ if(!copyas(&p->to, v))
+ if(copysub(&p->to, v, s, 1))
+ return 1;
+ return 0;
+ }
+ if(copyas(&p->to, v)) {
+ if(p->reg == NREG)
+ p->reg = p->to.reg;
+ if(copyau(&p->from, v))
+ return 4;
+ if(copyau1(p, v))
+ return 4;
+ return 3;
+ }
+ if(copyau(&p->from, v))
+ return 1;
+ if(copyau1(p, v))
+ return 1;
+ if(copyau(&p->to, v))
+ return 1;
+ return 0;
+
+ case ABEQ: /* read, read */
+ case ABNE:
+ case ABCS:
+ case ABHS:
+ case ABCC:
+ case ABLO:
+ case ABMI:
+ case ABPL:
+ case ABVS:
+ case ABVC:
+ case ABHI:
+ case ABLS:
+ case ABGE:
+ case ABLT:
+ case ABGT:
+ case ABLE:
+ if(s != A) {
+ if(copysub(&p->from, v, s, 1))
+ return 1;
+ return copysub1(p, v, s, 1);
+ }
+ if(copyau(&p->from, v))
+ return 1;
+ if(copyau1(p, v))
+ return 1;
+ return 0;
+
+ case AB: /* funny */
+ if(s != A) {
+ if(copysub(&p->to, v, s, 1))
+ return 1;
+ return 0;
+ }
+ if(copyau(&p->to, v))
+ return 1;
+ return 0;
+
+ case ARET: /* funny */
+ if(v->type == D_REG)
+ if(v->reg == REGRET)
+ return 2;
+ if(v->type == D_FREG)
+ if(v->reg == FREGRET)
+ return 2;
+
+ case ABL: /* funny */
+ if(v->type == D_REG) {
+ if(v->reg <= REGEXT && v->reg > exregoffset)
+ return 2;
+ if(v->reg == (uchar)REGARG)
+ return 2;
+ }
+ if(v->type == D_FREG)
+ if(v->reg <= FREGEXT && v->reg > exfregoffset)
+ return 2;
+
+ if(s != A) {
+ if(copysub(&p->to, v, s, 1))
+ return 1;
+ return 0;
+ }
+ if(copyau(&p->to, v))
+ return 4;
+ return 3;
+
+ case ATEXT: /* funny */
+ if(v->type == D_REG)
+ if(v->reg == (uchar)REGARG)
+ return 3;
+ return 0;
+ }
+}
+
+int
+a2type(Prog *p)
+{
+
+ switch(p->as) {
+
+ case ACMP:
+ case ACMN:
+
+ case AADD:
+ case ASUB:
+ case ARSB:
+ case ASLL:
+ case ASRL:
+ case ASRA:
+ case AORR:
+ case AAND:
+ case AEOR:
+ case AMUL:
+ case ADIV:
+ case ADIVU:
+ return D_REG;
+
+ case ACMPF:
+ case ACMPD:
+
+ case AADDF:
+ case AADDD:
+ case ASUBF:
+ case ASUBD:
+ case AMULF:
+ case AMULD:
+ case ADIVF:
+ case ADIVD:
+ return D_FREG;
+ }
+ return D_NONE;
+}
+
+/*
+ * direct reference,
+ * could be set/use depending on
+ * semantics
+ */
+int
+copyas(Adr *a, Adr *v)
+{
+
+ if(regtyp(v)) {
+ if(a->type == v->type)
+ if(a->reg == v->reg)
+ return 1;
+ } else if(v->type == D_CONST) { /* for constprop */
+ if(a->type == v->type)
+ if(a->name == v->name)
+ if(a->sym == v->sym)
+ if(a->reg == v->reg)
+ if(a->offset == v->offset)
+ return 1;
+ }
+ return 0;
+}
+
+/*
+ * either direct or indirect
+ */
+int
+copyau(Adr *a, Adr *v)
+{
+
+ if(copyas(a, v))
+ return 1;
+ if(v->type == D_REG) {
+ if(a->type == D_OREG) {
+ if(v->reg == a->reg)
+ return 1;
+ } else if(a->type == D_SHIFT) {
+ if((a->offset&0xf) == v->reg)
+ return 1;
+ if((a->offset&(1<<4)) && (a->offset>>8) == v->reg)
+ return 1;
+ }
+ }
+ return 0;
+}
+
+int
+copyau1(Prog *p, Adr *v)
+{
+
+ if(regtyp(v)) {
+ if(a2type(p) == v->type)
+ if(p->reg == v->reg) {
+ if(a2type(p) != v->type)
+ print("botch a2type %P\n", p);
+ return 1;
+ }
+ }
+ return 0;
+}
+
+/*
+ * substitute s for v in a
+ * return failure to substitute
+ */
+int
+copysub(Adr *a, Adr *v, Adr *s, int f)
+{
+
+ if(f)
+ if(copyau(a, v)) {
+ if(a->type == D_SHIFT) {
+ if((a->offset&0xf) == v->reg)
+ a->offset = (a->offset&~0xf)|s->reg;
+ if((a->offset&(1<<4)) && (a->offset>>8) == v->reg)
+ a->offset = (a->offset&~(0xf<<8))|(s->reg<<8);
+ } else
+ a->reg = s->reg;
+ }
+ return 0;
+}
+
+int
+copysub1(Prog *p1, Adr *v, Adr *s, int f)
+{
+
+ if(f)
+ if(copyau1(p1, v))
+ p1->reg = s->reg;
+ return 0;
+}
+
+struct {
+ int opcode;
+ int notopcode;
+ int scond;
+ int notscond;
+} predinfo[] = {
+ { ABEQ, ABNE, 0x0, 0x1, },
+ { ABNE, ABEQ, 0x1, 0x0, },
+ { ABCS, ABCC, 0x2, 0x3, },
+ { ABHS, ABLO, 0x2, 0x3, },
+ { ABCC, ABCS, 0x3, 0x2, },
+ { ABLO, ABHS, 0x3, 0x2, },
+ { ABMI, ABPL, 0x4, 0x5, },
+ { ABPL, ABMI, 0x5, 0x4, },
+ { ABVS, ABVC, 0x6, 0x7, },
+ { ABVC, ABVS, 0x7, 0x6, },
+ { ABHI, ABLS, 0x8, 0x9, },
+ { ABLS, ABHI, 0x9, 0x8, },
+ { ABGE, ABLT, 0xA, 0xB, },
+ { ABLT, ABGE, 0xB, 0xA, },
+ { ABGT, ABLE, 0xC, 0xD, },
+ { ABLE, ABGT, 0xD, 0xC, },
+};
+
+typedef struct {
+ Reg *start;
+ Reg *last;
+ Reg *end;
+ int len;
+} Joininfo;
+
+enum {
+ Join,
+ Split,
+ End,
+ Branch,
+ Setcond,
+ Toolong
+};
+
+enum {
+ Falsecond,
+ Truecond,
+ Delbranch,
+ Keepbranch
+};
+
+int
+isbranch(Prog *p)
+{
+ return (ABEQ <= p->as) && (p->as <= ABLE);
+}
+
+int
+predicable(Prog *p)
+{
+ if (isbranch(p)
+ || p->as == ANOP
+ || p->as == AXXX
+ || p->as == ADATA
+ || p->as == AGLOBL
+ || p->as == AGOK
+ || p->as == AHISTORY
+ || p->as == ANAME
+ || p->as == ASIGNAME
+ || p->as == ATEXT
+ || p->as == AWORD
+ || p->as == ABCASE
+ || p->as == ACASE)
+ return 0;
+ return 1;
+}
+
+/*
+ * Depends on an analysis of the encodings performed by 5l.
+ * These seem to be all of the opcodes that lead to the "S" bit
+ * being set in the instruction encodings.
+ *
+ * C_SBIT may also have been set explicitly in p->scond.
+ */
+int
+modifiescpsr(Prog *p)
+{
+ return (p->scond&C_SBIT)
+ || p->as == ATST
+ || p->as == ATEQ
+ || p->as == ACMN
+ || p->as == ACMP
+ || p->as == AMULU
+ || p->as == ADIVU
+ || p->as == AMUL
+ || p->as == ADIV
+ || p->as == AMOD
+ || p->as == AMODU
+ || p->as == ABL;
+}
+
+/*
+ * Find the maximal chain of instructions starting with r which could
+ * be executed conditionally
+ */
+int
+joinsplit(Reg *r, Joininfo *j)
+{
+ j->start = r;
+ j->last = r;
+ j->len = 0;
+ do {
+ if (r->p2 && (r->p1 || r->p2->p2link)) {
+ j->end = r;
+ return Join;
+ }
+ if (r->s1 && r->s2) {
+ j->end = r;
+ return Split;
+ }
+ j->last = r;
+ if (r->prog->as != ANOP)
+ j->len++;
+ if (!r->s1 && !r->s2) {
+ j->end = r->link;
+ return End;
+ }
+ if (r->s2) {
+ j->end = r->s2;
+ return Branch;
+ }
+ if (modifiescpsr(r->prog)) {
+ j->end = r->s1;
+ return Setcond;
+ }
+ r = r->s1;
+ } while (j->len < 4);
+ j->end = r;
+ return Toolong;
+}
+
+Reg *
+successor(Reg *r)
+{
+ if (r->s1)
+ return r->s1;
+ else
+ return r->s2;
+}
+
+void
+applypred(Reg *rstart, Joininfo *j, int cond, int branch)
+{
+ int pred;
+ Reg *r;
+
+ if(j->len == 0)
+ return;
+ if (cond == Truecond)
+ pred = predinfo[rstart->prog->as - ABEQ].scond;
+ else
+ pred = predinfo[rstart->prog->as - ABEQ].notscond;
+
+ for (r = j->start; ; r = successor(r)) {
+ if (r->prog->as == AB) {
+ if (r != j->last || branch == Delbranch)
+ excise(r);
+ else {
+ if (cond == Truecond)
+ r->prog->as = predinfo[rstart->prog->as - ABEQ].opcode;
+ else
+ r->prog->as = predinfo[rstart->prog->as - ABEQ].notopcode;
+ }
+ }
+ else if (predicable(r->prog))
+ r->prog->scond = (r->prog->scond&~C_SCOND)|pred;
+ if (r->s1 != r->link) {
+ r->s1 = r->link;
+ r->link->p1 = r;
+ }
+ if (r == j->last)
+ break;
+ }
+}
+
+void
+predicate(void)
+{
+ Reg *r;
+ int t1, t2;
+ Joininfo j1, j2;
+
+ for(r=firstr; r!=R; r=r->link) {
+ if (isbranch(r->prog)) {
+ t1 = joinsplit(r->s1, &j1);
+ t2 = joinsplit(r->s2, &j2);
+ if(j1.last->link != j2.start)
+ continue;
+ if(j1.end == j2.end)
+ if((t1 == Branch && (t2 == Join || t2 == Setcond)) ||
+ (t2 == Join && (t1 == Join || t1 == Setcond))) {
+ applypred(r, &j1, Falsecond, Delbranch);
+ applypred(r, &j2, Truecond, Delbranch);
+ excise(r);
+ continue;
+ }
+ if(t1 == End || t1 == Branch) {
+ applypred(r, &j1, Falsecond, Keepbranch);
+ excise(r);
+ continue;
+ }
+ }
+ }
+}
diff --git a/src/cmd/5c/reg.c b/src/cmd/5c/reg.c
new file mode 100644
index 000000000..1ccf74a35
--- /dev/null
+++ b/src/cmd/5c/reg.c
@@ -0,0 +1,1195 @@
+// Inferno utils/5c/reg.c
+// http://code.google.com/p/inferno-os/source/browse/utils/5c/reg.c
+//
+// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
+// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
+// Portions Copyright © 1997-1999 Vita Nuova Limited
+// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
+// Portions Copyright © 2004,2006 Bruce Ellis
+// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
+// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
+// Portions Copyright © 2009 The Go Authors. All rights reserved.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+
+#include "gc.h"
+
+void addsplits(void);
+
+Reg*
+rega(void)
+{
+ Reg *r;
+
+ r = freer;
+ if(r == R) {
+ r = alloc(sizeof(*r));
+ } else
+ freer = r->link;
+
+ *r = zreg;
+ return r;
+}
+
+int
+rcmp(const void *a1, const void *a2)
+{
+ Rgn *p1, *p2;
+ int c1, c2;
+
+ p1 = (Rgn*)a1;
+ p2 = (Rgn*)a2;
+ c1 = p2->cost;
+ c2 = p1->cost;
+ if(c1 -= c2)
+ return c1;
+ return p2->varno - p1->varno;
+}
+
+void
+regopt(Prog *p)
+{
+ USED(p);
+ // TODO(kaib): optimizer disabled because it smashes R8 when running out of registers
+ // the disable is unconventionally here because the call is in common code shared by 5c/6c/8c
+ return;
+
+#ifdef NOTDEF
+ Reg *r, *r1, *r2;
+ Prog *p1;
+ int i, z;
+ int32 initpc, val, npc;
+ uint32 vreg;
+ Bits bit;
+ struct
+ {
+ int32 m;
+ int32 c;
+ Reg* p;
+ } log5[6], *lp;
+
+ firstr = R;
+ lastr = R;
+ nvar = 0;
+ regbits = 0;
+ for(z=0; z<BITS; z++) {
+ externs.b[z] = 0;
+ params.b[z] = 0;
+ consts.b[z] = 0;
+ addrs.b[z] = 0;
+ }
+
+ /*
+ * pass 1
+ * build aux data structure
+ * allocate pcs
+ * find use and set of variables
+ */
+ val = 5L * 5L * 5L * 5L * 5L;
+ lp = log5;
+ for(i=0; i<5; i++) {
+ lp->m = val;
+ lp->c = 0;
+ lp->p = R;
+ val /= 5L;
+ lp++;
+ }
+ val = 0;
+ for(; p != P; p = p->link) {
+ switch(p->as) {
+ case ADATA:
+ case AGLOBL:
+ case ANAME:
+ case ASIGNAME:
+ continue;
+ }
+ r = rega();
+ if(firstr == R) {
+ firstr = r;
+ lastr = r;
+ } else {
+ lastr->link = r;
+ r->p1 = lastr;
+ lastr->s1 = r;
+ lastr = r;
+ }
+ r->prog = p;
+ r->pc = val;
+ val++;
+
+ lp = log5;
+ for(i=0; i<5; i++) {
+ lp->c--;
+ if(lp->c <= 0) {
+ lp->c = lp->m;
+ if(lp->p != R)
+ lp->p->log5 = r;
+ lp->p = r;
+ (lp+1)->c = 0;
+ break;
+ }
+ lp++;
+ }
+
+ r1 = r->p1;
+ if(r1 != R)
+ switch(r1->prog->as) {
+ case ARET:
+ case AB:
+ case ARFE:
+ r->p1 = R;
+ r1->s1 = R;
+ }
+
+ /*
+ * left side always read
+ */
+ bit = mkvar(&p->from, p->as==AMOVW);
+ for(z=0; z<BITS; z++)
+ r->use1.b[z] |= bit.b[z];
+
+ /*
+ * right side depends on opcode
+ */
+ bit = mkvar(&p->to, 0);
+ if(bany(&bit))
+ switch(p->as) {
+ default:
+ diag(Z, "reg: unknown asop: %A", p->as);
+ break;
+
+ /*
+ * right side write
+ */
+ case ANOP:
+ case AMOVB:
+ case AMOVBU:
+ case AMOVH:
+ case AMOVHU:
+ case AMOVW:
+ case AMOVF:
+ case AMOVD:
+ for(z=0; z<BITS; z++)
+ r->set.b[z] |= bit.b[z];
+ break;
+
+ /*
+ * funny
+ */
+ case ABL:
+ for(z=0; z<BITS; z++)
+ addrs.b[z] |= bit.b[z];
+ break;
+ }
+
+ if(p->as == AMOVM) {
+ if(p->from.type == D_CONST)
+ z = p->from.offset;
+ else
+ z = p->to.offset;
+ for(i=0; z; i++) {
+ if(z&1)
+ regbits |= RtoB(i);
+ z >>= 1;
+ }
+ }
+ }
+ if(firstr == R)
+ return;
+ initpc = pc - val;
+ npc = val;
+
+ /*
+ * pass 2
+ * turn branch references to pointers
+ * build back pointers
+ */
+ for(r = firstr; r != R; r = r->link) {
+ p = r->prog;
+ if(p->to.type == D_BRANCH) {
+ val = p->to.offset - initpc;
+ r1 = firstr;
+ while(r1 != R) {
+ r2 = r1->log5;
+ if(r2 != R && val >= r2->pc) {
+ r1 = r2;
+ continue;
+ }
+ if(r1->pc == val)
+ break;
+ r1 = r1->link;
+ }
+ if(r1 == R) {
+ nearln = p->lineno;
+ diag(Z, "ref not found\n%P", p);
+ continue;
+ }
+ if(r1 == r) {
+ nearln = p->lineno;
+ diag(Z, "ref to self\n%P", p);
+ continue;
+ }
+ r->s2 = r1;
+ r->p2link = r1->p2;
+ r1->p2 = r;
+ }
+ }
+ if(debug['R']) {
+ p = firstr->prog;
+ print("\n%L %D\n", p->lineno, &p->from);
+ }
+
+ /*
+ * pass 2.5
+ * find looping structure
+ */
+ for(r = firstr; r != R; r = r->link)
+ r->active = 0;
+ change = 0;
+ loopit(firstr, npc);
+
+ /*
+ * pass 3
+ * iterate propagating usage
+ * back until flow graph is complete
+ */
+loop1:
+ change = 0;
+ for(r = firstr; r != R; r = r->link)
+ r->active = 0;
+ for(r = firstr; r != R; r = r->link)
+ if(r->prog->as == ARET)
+ prop(r, zbits, zbits);
+loop11:
+ /* pick up unreachable code */
+ i = 0;
+ for(r = firstr; r != R; r = r1) {
+ r1 = r->link;
+ if(r1 && r1->active && !r->active) {
+ prop(r, zbits, zbits);
+ i = 1;
+ }
+ }
+ if(i)
+ goto loop11;
+ if(change)
+ goto loop1;
+
+
+ /*
+ * pass 4
+ * iterate propagating register/variable synchrony
+ * forward until graph is complete
+ */
+loop2:
+ change = 0;
+ for(r = firstr; r != R; r = r->link)
+ r->active = 0;
+ synch(firstr, zbits);
+ if(change)
+ goto loop2;
+
+ addsplits();
+
+ if(debug['R'] && debug['v']) {
+ print("\nprop structure:\n");
+ for(r = firstr; r != R; r = r->link) {
+ print("%d:%P", r->loop, r->prog);
+ for(z=0; z<BITS; z++)
+ bit.b[z] = r->set.b[z] |
+ r->refahead.b[z] | r->calahead.b[z] |
+ r->refbehind.b[z] | r->calbehind.b[z] |
+ r->use1.b[z] | r->use2.b[z];
+ if(bany(&bit)) {
+ print("\t");
+ if(bany(&r->use1))
+ print(" u1=%B", r->use1);
+ if(bany(&r->use2))
+ print(" u2=%B", r->use2);
+ if(bany(&r->set))
+ print(" st=%B", r->set);
+ if(bany(&r->refahead))
+ print(" ra=%B", r->refahead);
+ if(bany(&r->calahead))
+ print(" ca=%B", r->calahead);
+ if(bany(&r->refbehind))
+ print(" rb=%B", r->refbehind);
+ if(bany(&r->calbehind))
+ print(" cb=%B", r->calbehind);
+ }
+ print("\n");
+ }
+ }
+
+ /*
+ * pass 5
+ * isolate regions
+ * calculate costs (paint1)
+ */
+ r = firstr;
+ if(r) {
+ for(z=0; z<BITS; z++)
+ bit.b[z] = (r->refahead.b[z] | r->calahead.b[z]) &
+ ~(externs.b[z] | params.b[z] | addrs.b[z] | consts.b[z]);
+ if(bany(&bit)) {
+ nearln = r->prog->lineno;
+ warn(Z, "used and not set: %B", bit);
+ if(debug['R'] && !debug['w'])
+ print("used and not set: %B\n", bit);
+ }
+ }
+
+ for(r = firstr; r != R; r = r->link)
+ r->act = zbits;
+ rgp = region;
+ nregion = 0;
+ for(r = firstr; r != R; r = r->link) {
+ for(z=0; z<BITS; z++)
+ bit.b[z] = r->set.b[z] &
+ ~(r->refahead.b[z] | r->calahead.b[z] | addrs.b[z]);
+ if(bany(&bit)) {
+ nearln = r->prog->lineno;
+ warn(Z, "set and not used: %B", bit);
+ if(debug['R'])
+ print("set and not used: %B\n", bit);
+ excise(r);
+ }
+ for(z=0; z<BITS; z++)
+ bit.b[z] = LOAD(r) & ~(r->act.b[z] | addrs.b[z]);
+ while(bany(&bit)) {
+ i = bnum(bit);
+ rgp->enter = r;
+ rgp->varno = i;
+ change = 0;
+ if(debug['R'] && debug['v'])
+ print("\n");
+ paint1(r, i);
+ bit.b[i/32] &= ~(1L<<(i%32));
+ if(change <= 0) {
+ if(debug['R'])
+ print("%L $%d: %B\n",
+ r->prog->lineno, change, blsh(i));
+ continue;
+ }
+ rgp->cost = change;
+ nregion++;
+ if(nregion >= NRGN) {
+ warn(Z, "too many regions");
+ goto brk;
+ }
+ rgp++;
+ }
+ }
+brk:
+ qsort(region, nregion, sizeof(region[0]), rcmp);
+
+ /*
+ * pass 6
+ * determine used registers (paint2)
+ * replace code (paint3)
+ */
+ rgp = region;
+ for(i=0; i<nregion; i++) {
+ bit = blsh(rgp->varno);
+ vreg = paint2(rgp->enter, rgp->varno);
+ vreg = allreg(vreg, rgp);
+ if(debug['R']) {
+ if(rgp->regno >= NREG)
+ print("%L $%d F%d: %B\n",
+ rgp->enter->prog->lineno,
+ rgp->cost,
+ rgp->regno-NREG,
+ bit);
+ else
+ print("%L $%d R%d: %B\n",
+ rgp->enter->prog->lineno,
+ rgp->cost,
+ rgp->regno,
+ bit);
+ }
+ if(rgp->regno != 0)
+ paint3(rgp->enter, rgp->varno, vreg, rgp->regno);
+ rgp++;
+ }
+ /*
+ * pass 7
+ * peep-hole on basic block
+ */
+ if(!debug['R'] || debug['P'])
+ peep();
+
+ /*
+ * pass 8
+ * recalculate pc
+ */
+ val = initpc;
+ for(r = firstr; r != R; r = r1) {
+ r->pc = val;
+ p = r->prog;
+ p1 = P;
+ r1 = r->link;
+ if(r1 != R)
+ p1 = r1->prog;
+ for(; p != p1; p = p->link) {
+ switch(p->as) {
+ default:
+ val++;
+ break;
+
+ case ANOP:
+ case ADATA:
+ case AGLOBL:
+ case ANAME:
+ case ASIGNAME:
+ break;
+ }
+ }
+ }
+ pc = val;
+
+ /*
+ * fix up branches
+ */
+ if(debug['R'])
+ if(bany(&addrs))
+ print("addrs: %B\n", addrs);
+
+ r1 = 0; /* set */
+ for(r = firstr; r != R; r = r->link) {
+ p = r->prog;
+ if(p->to.type == D_BRANCH)
+ p->to.offset = r->s2->pc;
+ r1 = r;
+ }
+
+ /*
+ * last pass
+ * eliminate nops
+ * free aux structures
+ */
+ for(p = firstr->prog; p != P; p = p->link){
+ while(p->link && p->link->as == ANOP)
+ p->link = p->link->link;
+ }
+ if(r1 != R) {
+ r1->link = freer;
+ freer = firstr;
+ }
+#endif
+}
+
+void
+addsplits(void)
+{
+ Reg *r, *r1;
+ int z, i;
+ Bits bit;
+
+ for(r = firstr; r != R; r = r->link) {
+ if(r->loop > 1)
+ continue;
+ if(r->prog->as == ABL)
+ continue;
+ for(r1 = r->p2; r1 != R; r1 = r1->p2link) {
+ if(r1->loop <= 1)
+ continue;
+ for(z=0; z<BITS; z++)
+ bit.b[z] = r1->calbehind.b[z] &
+ (r->refahead.b[z] | r->use1.b[z] | r->use2.b[z]) &
+ ~(r->calahead.b[z] & addrs.b[z]);
+ while(bany(&bit)) {
+ i = bnum(bit);
+ bit.b[i/32] &= ~(1L << (i%32));
+ }
+ }
+ }
+}
+
+/*
+ * add mov b,rn
+ * just after r
+ */
+void
+addmove(Reg *r, int bn, int rn, int f)
+{
+ Prog *p, *p1;
+ Adr *a;
+ Var *v;
+
+ p1 = alloc(sizeof(*p1));
+ *p1 = zprog;
+ p = r->prog;
+
+ p1->link = p->link;
+ p->link = p1;
+ p1->lineno = p->lineno;
+
+ v = var + bn;
+
+ a = &p1->to;
+ a->sym = v->sym;
+ a->name = v->name;
+ a->offset = v->offset;
+ a->etype = v->etype;
+ a->type = D_OREG;
+ if(a->etype == TARRAY || a->sym == S)
+ a->type = D_CONST;
+
+ p1->as = AMOVW;
+ if(v->etype == TCHAR || v->etype == TUCHAR)
+ p1->as = AMOVB;
+ if(v->etype == TSHORT || v->etype == TUSHORT)
+ p1->as = AMOVH;
+ if(v->etype == TFLOAT)
+ p1->as = AMOVF;
+ if(v->etype == TDOUBLE)
+ p1->as = AMOVD;
+
+ p1->from.type = D_REG;
+ p1->from.reg = rn;
+ if(rn >= NREG) {
+ p1->from.type = D_FREG;
+ p1->from.reg = rn-NREG;
+ }
+ if(!f) {
+ p1->from = *a;
+ *a = zprog.from;
+ a->type = D_REG;
+ a->reg = rn;
+ if(rn >= NREG) {
+ a->type = D_FREG;
+ a->reg = rn-NREG;
+ }
+ if(v->etype == TUCHAR)
+ p1->as = AMOVBU;
+ if(v->etype == TUSHORT)
+ p1->as = AMOVHU;
+ }
+ if(debug['R'])
+ print("%P\t.a%P\n", p, p1);
+}
+
+Bits
+mkvar(Adr *a, int docon)
+{
+ Var *v;
+ int i, t, n, et, z;
+ int32 o;
+ Bits bit;
+ Sym *s;
+
+ t = a->type;
+ if(t == D_REG && a->reg != NREG)
+ regbits |= RtoB(a->reg);
+ if(t == D_FREG && a->reg != NREG)
+ regbits |= FtoB(a->reg);
+ s = a->sym;
+ o = a->offset;
+ et = a->etype;
+ if(s == S) {
+ if(t != D_CONST || !docon || a->reg != NREG)
+ goto none;
+ et = TLONG;
+ }
+ if(t == D_CONST) {
+ if(s == S && sval(o))
+ goto none;
+ }
+
+ n = a->name;
+ v = var;
+ for(i=0; i<nvar; i++) {
+ if(s == v->sym)
+ if(n == v->name)
+ if(o == v->offset)
+ goto out;
+ v++;
+ }
+ if(s)
+ if(s->name[0] == '.')
+ goto none;
+ if(nvar >= NVAR) {
+ if(debug['w'] > 1 && s)
+ warn(Z, "variable not optimized: %s", s->name);
+ goto none;
+ }
+ i = nvar;
+ nvar++;
+ v = &var[i];
+ v->sym = s;
+ v->offset = o;
+ v->etype = et;
+ v->name = n;
+ if(debug['R'])
+ print("bit=%2d et=%2d %D\n", i, et, a);
+out:
+ bit = blsh(i);
+ if(n == D_EXTERN || n == D_STATIC)
+ for(z=0; z<BITS; z++)
+ externs.b[z] |= bit.b[z];
+ if(n == D_PARAM)
+ for(z=0; z<BITS; z++)
+ params.b[z] |= bit.b[z];
+ if(v->etype != et || !typechlpfd[et]) /* funny punning */
+ for(z=0; z<BITS; z++)
+ addrs.b[z] |= bit.b[z];
+ if(t == D_CONST) {
+ if(s == S) {
+ for(z=0; z<BITS; z++)
+ consts.b[z] |= bit.b[z];
+ return bit;
+ }
+ if(et != TARRAY)
+ for(z=0; z<BITS; z++)
+ addrs.b[z] |= bit.b[z];
+ for(z=0; z<BITS; z++)
+ params.b[z] |= bit.b[z];
+ return bit;
+ }
+ if(t == D_OREG)
+ return bit;
+
+none:
+ return zbits;
+}
+
+void
+prop(Reg *r, Bits ref, Bits cal)
+{
+ Reg *r1, *r2;
+ int z;
+
+ for(r1 = r; r1 != R; r1 = r1->p1) {
+ for(z=0; z<BITS; z++) {
+ ref.b[z] |= r1->refahead.b[z];
+ if(ref.b[z] != r1->refahead.b[z]) {
+ r1->refahead.b[z] = ref.b[z];
+ change++;
+ }
+ cal.b[z] |= r1->calahead.b[z];
+ if(cal.b[z] != r1->calahead.b[z]) {
+ r1->calahead.b[z] = cal.b[z];
+ change++;
+ }
+ }
+ switch(r1->prog->as) {
+ case ABL:
+ for(z=0; z<BITS; z++) {
+ cal.b[z] |= ref.b[z] | externs.b[z];
+ ref.b[z] = 0;
+ }
+ break;
+
+ case ATEXT:
+ for(z=0; z<BITS; z++) {
+ cal.b[z] = 0;
+ ref.b[z] = 0;
+ }
+ break;
+
+ case ARET:
+ for(z=0; z<BITS; z++) {
+ cal.b[z] = externs.b[z];
+ ref.b[z] = 0;
+ }
+ }
+ for(z=0; z<BITS; z++) {
+ ref.b[z] = (ref.b[z] & ~r1->set.b[z]) |
+ r1->use1.b[z] | r1->use2.b[z];
+ cal.b[z] &= ~(r1->set.b[z] | r1->use1.b[z] | r1->use2.b[z]);
+ r1->refbehind.b[z] = ref.b[z];
+ r1->calbehind.b[z] = cal.b[z];
+ }
+ if(r1->active)
+ break;
+ r1->active = 1;
+ }
+ for(; r != r1; r = r->p1)
+ for(r2 = r->p2; r2 != R; r2 = r2->p2link)
+ prop(r2, r->refbehind, r->calbehind);
+}
+
+/*
+ * find looping structure
+ *
+ * 1) find reverse postordering
+ * 2) find approximate dominators,
+ * the actual dominators if the flow graph is reducible
+ * otherwise, dominators plus some other non-dominators.
+ * See Matthew S. Hecht and Jeffrey D. Ullman,
+ * "Analysis of a Simple Algorithm for Global Data Flow Problems",
+ * Conf. Record of ACM Symp. on Principles of Prog. Langs, Boston, Massachusetts,
+ * Oct. 1-3, 1973, pp. 207-217.
+ * 3) find all nodes with a predecessor dominated by the current node.
+ * such a node is a loop head.
+ * recursively, all preds with a greater rpo number are in the loop
+ */
+int32
+postorder(Reg *r, Reg **rpo2r, int32 n)
+{
+ Reg *r1;
+
+ r->rpo = 1;
+ r1 = r->s1;
+ if(r1 && !r1->rpo)
+ n = postorder(r1, rpo2r, n);
+ r1 = r->s2;
+ if(r1 && !r1->rpo)
+ n = postorder(r1, rpo2r, n);
+ rpo2r[n] = r;
+ n++;
+ return n;
+}
+
+int32
+rpolca(int32 *idom, int32 rpo1, int32 rpo2)
+{
+ int32 t;
+
+ if(rpo1 == -1)
+ return rpo2;
+ while(rpo1 != rpo2){
+ if(rpo1 > rpo2){
+ t = rpo2;
+ rpo2 = rpo1;
+ rpo1 = t;
+ }
+ while(rpo1 < rpo2){
+ t = idom[rpo2];
+ if(t >= rpo2)
+ fatal(Z, "bad idom");
+ rpo2 = t;
+ }
+ }
+ return rpo1;
+}
+
+int
+doms(int32 *idom, int32 r, int32 s)
+{
+ while(s > r)
+ s = idom[s];
+ return s == r;
+}
+
+int
+loophead(int32 *idom, Reg *r)
+{
+ int32 src;
+
+ src = r->rpo;
+ if(r->p1 != R && doms(idom, src, r->p1->rpo))
+ return 1;
+ for(r = r->p2; r != R; r = r->p2link)
+ if(doms(idom, src, r->rpo))
+ return 1;
+ return 0;
+}
+
+void
+loopmark(Reg **rpo2r, int32 head, Reg *r)
+{
+ if(r->rpo < head || r->active == head)
+ return;
+ r->active = head;
+ r->loop += LOOP;
+ if(r->p1 != R)
+ loopmark(rpo2r, head, r->p1);
+ for(r = r->p2; r != R; r = r->p2link)
+ loopmark(rpo2r, head, r);
+}
+
+void
+loopit(Reg *r, int32 nr)
+{
+ Reg *r1;
+ int32 i, d, me;
+
+ if(nr > maxnr) {
+ rpo2r = alloc(nr * sizeof(Reg*));
+ idom = alloc(nr * sizeof(int32));
+ maxnr = nr;
+ }
+ d = postorder(r, rpo2r, 0);
+ if(d > nr)
+ fatal(Z, "too many reg nodes");
+ nr = d;
+ for(i = 0; i < nr / 2; i++){
+ r1 = rpo2r[i];
+ rpo2r[i] = rpo2r[nr - 1 - i];
+ rpo2r[nr - 1 - i] = r1;
+ }
+ for(i = 0; i < nr; i++)
+ rpo2r[i]->rpo = i;
+
+ idom[0] = 0;
+ for(i = 0; i < nr; i++){
+ r1 = rpo2r[i];
+ me = r1->rpo;
+ d = -1;
+ if(r1->p1 != R && r1->p1->rpo < me)
+ d = r1->p1->rpo;
+ for(r1 = r1->p2; r1 != nil; r1 = r1->p2link)
+ if(r1->rpo < me)
+ d = rpolca(idom, d, r1->rpo);
+ idom[i] = d;
+ }
+
+ for(i = 0; i < nr; i++){
+ r1 = rpo2r[i];
+ r1->loop++;
+ if(r1->p2 != R && loophead(idom, r1))
+ loopmark(rpo2r, i, r1);
+ }
+}
+
+void
+synch(Reg *r, Bits dif)
+{
+ Reg *r1;
+ int z;
+
+ for(r1 = r; r1 != R; r1 = r1->s1) {
+ for(z=0; z<BITS; z++) {
+ dif.b[z] = (dif.b[z] &
+ ~(~r1->refbehind.b[z] & r1->refahead.b[z])) |
+ r1->set.b[z] | r1->regdiff.b[z];
+ if(dif.b[z] != r1->regdiff.b[z]) {
+ r1->regdiff.b[z] = dif.b[z];
+ change++;
+ }
+ }
+ if(r1->active)
+ break;
+ r1->active = 1;
+ for(z=0; z<BITS; z++)
+ dif.b[z] &= ~(~r1->calbehind.b[z] & r1->calahead.b[z]);
+ if(r1->s2 != R)
+ synch(r1->s2, dif);
+ }
+}
+
+uint32
+allreg(uint32 b, Rgn *r)
+{
+ Var *v;
+ int i;
+
+ v = var + r->varno;
+ r->regno = 0;
+ switch(v->etype) {
+
+ default:
+ diag(Z, "unknown etype %d/%d", bitno(b), v->etype);
+ break;
+
+ case TCHAR:
+ case TUCHAR:
+ case TSHORT:
+ case TUSHORT:
+ case TINT:
+ case TUINT:
+ case TLONG:
+ case TULONG:
+ case TIND:
+ case TARRAY:
+ i = BtoR(~b);
+ if(i && r->cost >= 0) {
+ r->regno = i;
+ return RtoB(i);
+ }
+ break;
+
+ case TVLONG:
+ case TDOUBLE:
+ case TFLOAT:
+ i = BtoF(~b);
+ if(i && r->cost >= 0) {
+ r->regno = i+NREG;
+ return FtoB(i);
+ }
+ break;
+ }
+ return 0;
+}
+
+void
+paint1(Reg *r, int bn)
+{
+ Reg *r1;
+ Prog *p;
+ int z;
+ uint32 bb;
+
+ z = bn/32;
+ bb = 1L<<(bn%32);
+ if(r->act.b[z] & bb)
+ return;
+ for(;;) {
+ if(!(r->refbehind.b[z] & bb))
+ break;
+ r1 = r->p1;
+ if(r1 == R)
+ break;
+ if(!(r1->refahead.b[z] & bb))
+ break;
+ if(r1->act.b[z] & bb)
+ break;
+ r = r1;
+ }
+
+ if(LOAD(r) & ~(r->set.b[z] & ~(r->use1.b[z]|r->use2.b[z])) & bb) {
+ change -= CLOAD * r->loop;
+ if(debug['R'] && debug['v'])
+ print("%d%P\td %B $%d\n", r->loop,
+ r->prog, blsh(bn), change);
+ }
+ for(;;) {
+ r->act.b[z] |= bb;
+ p = r->prog;
+
+ if(r->use1.b[z] & bb) {
+ change += CREF * r->loop;
+ if(debug['R'] && debug['v'])
+ print("%d%P\tu1 %B $%d\n", r->loop,
+ p, blsh(bn), change);
+ }
+
+ if((r->use2.b[z]|r->set.b[z]) & bb) {
+ change += CREF * r->loop;
+ if(debug['R'] && debug['v'])
+ print("%d%P\tu2 %B $%d\n", r->loop,
+ p, blsh(bn), change);
+ }
+
+ if(STORE(r) & r->regdiff.b[z] & bb) {
+ change -= CLOAD * r->loop;
+ if(debug['R'] && debug['v'])
+ print("%d%P\tst %B $%d\n", r->loop,
+ p, blsh(bn), change);
+ }
+
+ if(r->refbehind.b[z] & bb)
+ for(r1 = r->p2; r1 != R; r1 = r1->p2link)
+ if(r1->refahead.b[z] & bb)
+ paint1(r1, bn);
+
+ if(!(r->refahead.b[z] & bb))
+ break;
+ r1 = r->s2;
+ if(r1 != R)
+ if(r1->refbehind.b[z] & bb)
+ paint1(r1, bn);
+ r = r->s1;
+ if(r == R)
+ break;
+ if(r->act.b[z] & bb)
+ break;
+ if(!(r->refbehind.b[z] & bb))
+ break;
+ }
+}
+
+uint32
+paint2(Reg *r, int bn)
+{
+ Reg *r1;
+ int z;
+ uint32 bb, vreg;
+
+ z = bn/32;
+ bb = 1L << (bn%32);
+ vreg = regbits;
+ if(!(r->act.b[z] & bb))
+ return vreg;
+ for(;;) {
+ if(!(r->refbehind.b[z] & bb))
+ break;
+ r1 = r->p1;
+ if(r1 == R)
+ break;
+ if(!(r1->refahead.b[z] & bb))
+ break;
+ if(!(r1->act.b[z] & bb))
+ break;
+ r = r1;
+ }
+ for(;;) {
+ r->act.b[z] &= ~bb;
+
+ vreg |= r->regu;
+
+ if(r->refbehind.b[z] & bb)
+ for(r1 = r->p2; r1 != R; r1 = r1->p2link)
+ if(r1->refahead.b[z] & bb)
+ vreg |= paint2(r1, bn);
+
+ if(!(r->refahead.b[z] & bb))
+ break;
+ r1 = r->s2;
+ if(r1 != R)
+ if(r1->refbehind.b[z] & bb)
+ vreg |= paint2(r1, bn);
+ r = r->s1;
+ if(r == R)
+ break;
+ if(!(r->act.b[z] & bb))
+ break;
+ if(!(r->refbehind.b[z] & bb))
+ break;
+ }
+ return vreg;
+}
+
+void
+paint3(Reg *r, int bn, int32 rb, int rn)
+{
+ Reg *r1;
+ Prog *p;
+ int z;
+ uint32 bb;
+
+ z = bn/32;
+ bb = 1L << (bn%32);
+ if(r->act.b[z] & bb)
+ return;
+ for(;;) {
+ if(!(r->refbehind.b[z] & bb))
+ break;
+ r1 = r->p1;
+ if(r1 == R)
+ break;
+ if(!(r1->refahead.b[z] & bb))
+ break;
+ if(r1->act.b[z] & bb)
+ break;
+ r = r1;
+ }
+
+ if(LOAD(r) & ~(r->set.b[z] & ~(r->use1.b[z]|r->use2.b[z])) & bb)
+ addmove(r, bn, rn, 0);
+ for(;;) {
+ r->act.b[z] |= bb;
+ p = r->prog;
+
+ if(r->use1.b[z] & bb) {
+ if(debug['R'])
+ print("%P", p);
+ addreg(&p->from, rn);
+ if(debug['R'])
+ print("\t.c%P\n", p);
+ }
+ if((r->use2.b[z]|r->set.b[z]) & bb) {
+ if(debug['R'])
+ print("%P", p);
+ addreg(&p->to, rn);
+ if(debug['R'])
+ print("\t.c%P\n", p);
+ }
+
+ if(STORE(r) & r->regdiff.b[z] & bb)
+ addmove(r, bn, rn, 1);
+ r->regu |= rb;
+
+ if(r->refbehind.b[z] & bb)
+ for(r1 = r->p2; r1 != R; r1 = r1->p2link)
+ if(r1->refahead.b[z] & bb)
+ paint3(r1, bn, rb, rn);
+
+ if(!(r->refahead.b[z] & bb))
+ break;
+ r1 = r->s2;
+ if(r1 != R)
+ if(r1->refbehind.b[z] & bb)
+ paint3(r1, bn, rb, rn);
+ r = r->s1;
+ if(r == R)
+ break;
+ if(r->act.b[z] & bb)
+ break;
+ if(!(r->refbehind.b[z] & bb))
+ break;
+ }
+}
+
+void
+addreg(Adr *a, int rn)
+{
+
+ a->sym = 0;
+ a->name = D_NONE;
+ a->type = D_REG;
+ a->reg = rn;
+ if(rn >= NREG) {
+ a->type = D_FREG;
+ a->reg = rn-NREG;
+ }
+}
+
+/*
+ * bit reg
+ * 0 R0
+ * 1 R1
+ * ... ...
+ * 10 R10
+ */
+int32
+RtoB(int r)
+{
+
+ if(r < 2 || r >= REGTMP-2) // excluded R9 and R10 for m and g
+ return 0;
+ return 1L << r;
+}
+
+int
+BtoR(int32 b)
+{
+ b &= 0x01fcL; // excluded R9 and R10 for m and g
+ if(b == 0)
+ return 0;
+ return bitno(b);
+}
+
+/*
+ * bit reg
+ * 18 F2
+ * 19 F3
+ * ... ...
+ * 23 F7
+ */
+int32
+FtoB(int f)
+{
+
+ if(f < 2 || f > NFREG-1)
+ return 0;
+ return 1L << (f + 16);
+}
+
+int
+BtoF(int32 b)
+{
+
+ b &= 0xfc0000L;
+ if(b == 0)
+ return 0;
+ return bitno(b) - 16;
+}
diff --git a/src/cmd/5c/sgen.c b/src/cmd/5c/sgen.c
new file mode 100644
index 000000000..92a0f64f8
--- /dev/null
+++ b/src/cmd/5c/sgen.c
@@ -0,0 +1,267 @@
+// Inferno utils/5c/sgen.c
+// http://code.google.com/p/inferno-os/source/browse/utils/5c/sgen.c
+//
+// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
+// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
+// Portions Copyright © 1997-1999 Vita Nuova Limited
+// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
+// Portions Copyright © 2004,2006 Bruce Ellis
+// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
+// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
+// Portions Copyright © 2009 The Go Authors. All rights reserved.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+
+#include "gc.h"
+
+Prog*
+gtext(Sym *s, int32 stkoff)
+{
+ int32 a;
+
+ a = 0;
+ if(!(textflag & NOSPLIT))
+ a = argsize();
+ else if(stkoff >= 128)
+ yyerror("stack frame too large for NOSPLIT function");
+
+ gpseudo(ATEXT, s, nodconst(stkoff));
+ p->to.type = D_CONST2;
+ p->to.offset2 = a;
+ return p;
+}
+
+void
+noretval(int n)
+{
+
+ if(n & 1) {
+ gins(ANOP, Z, Z);
+ p->to.type = D_REG;
+ p->to.reg = REGRET;
+ }
+ if(n & 2) {
+ gins(ANOP, Z, Z);
+ p->to.type = D_FREG;
+ p->to.reg = FREGRET;
+ }
+}
+
+/*
+ * calculate addressability as follows
+ * CONST ==> 20 $value
+ * NAME ==> 10 name
+ * REGISTER ==> 11 register
+ * INDREG ==> 12 *[(reg)+offset]
+ * &10 ==> 2 $name
+ * ADD(2, 20) ==> 2 $name+offset
+ * ADD(3, 20) ==> 3 $(reg)+offset
+ * &12 ==> 3 $(reg)+offset
+ * *11 ==> 11 ??
+ * *2 ==> 10 name
+ * *3 ==> 12 *(reg)+offset
+ * calculate complexity (number of registers)
+ */
+void
+xcom(Node *n)
+{
+ Node *l, *r;
+ int t;
+
+ if(n == Z)
+ return;
+ l = n->left;
+ r = n->right;
+ n->addable = 0;
+ n->complex = 0;
+ switch(n->op) {
+ case OCONST:
+ n->addable = 20;
+ return;
+
+ case OREGISTER:
+ n->addable = 11;
+ return;
+
+ case OINDREG:
+ n->addable = 12;
+ return;
+
+ case ONAME:
+ n->addable = 10;
+ return;
+
+ case OADDR:
+ xcom(l);
+ if(l->addable == 10)
+ n->addable = 2;
+ if(l->addable == 12)
+ n->addable = 3;
+ break;
+
+ case OIND:
+ xcom(l);
+ if(l->addable == 11)
+ n->addable = 12;
+ if(l->addable == 3)
+ n->addable = 12;
+ if(l->addable == 2)
+ n->addable = 10;
+ break;
+
+ case OADD:
+ xcom(l);
+ xcom(r);
+ if(l->addable == 20) {
+ if(r->addable == 2)
+ n->addable = 2;
+ if(r->addable == 3)
+ n->addable = 3;
+ }
+ if(r->addable == 20) {
+ if(l->addable == 2)
+ n->addable = 2;
+ if(l->addable == 3)
+ n->addable = 3;
+ }
+ break;
+
+ case OASLMUL:
+ case OASMUL:
+ xcom(l);
+ xcom(r);
+ t = vlog(r);
+ if(t >= 0) {
+ n->op = OASASHL;
+ r->vconst = t;
+ r->type = types[TINT];
+ }
+ break;
+
+ case OMUL:
+ case OLMUL:
+ xcom(l);
+ xcom(r);
+ t = vlog(r);
+ if(t >= 0) {
+ n->op = OASHL;
+ r->vconst = t;
+ r->type = types[TINT];
+ }
+ t = vlog(l);
+ if(t >= 0) {
+ n->op = OASHL;
+ n->left = r;
+ n->right = l;
+ r = l;
+ l = n->left;
+ r->vconst = t;
+ r->type = types[TINT];
+ }
+ break;
+
+ case OASLDIV:
+ xcom(l);
+ xcom(r);
+ t = vlog(r);
+ if(t >= 0) {
+ n->op = OASLSHR;
+ r->vconst = t;
+ r->type = types[TINT];
+ }
+ break;
+
+ case OLDIV:
+ xcom(l);
+ xcom(r);
+ t = vlog(r);
+ if(t >= 0) {
+ n->op = OLSHR;
+ r->vconst = t;
+ r->type = types[TINT];
+ }
+ break;
+
+ case OASLMOD:
+ xcom(l);
+ xcom(r);
+ t = vlog(r);
+ if(t >= 0) {
+ n->op = OASAND;
+ r->vconst--;
+ }
+ break;
+
+ case OLMOD:
+ xcom(l);
+ xcom(r);
+ t = vlog(r);
+ if(t >= 0) {
+ n->op = OAND;
+ r->vconst--;
+ }
+ break;
+
+ default:
+ if(l != Z)
+ xcom(l);
+ if(r != Z)
+ xcom(r);
+ break;
+ }
+ if(n->addable >= 10)
+ return;
+
+ if(l != Z)
+ n->complex = l->complex;
+ if(r != Z) {
+ if(r->complex == n->complex)
+ n->complex = r->complex+1;
+ else
+ if(r->complex > n->complex)
+ n->complex = r->complex;
+ }
+ if(n->complex == 0)
+ n->complex++;
+
+ if(com64(n))
+ return;
+
+ switch(n->op) {
+ case OFUNC:
+ n->complex = FNX;
+ break;
+
+ case OADD:
+ case OXOR:
+ case OAND:
+ case OOR:
+ case OEQ:
+ case ONE:
+ /*
+ * immediate operators, make const on right
+ */
+ if(l->op == OCONST) {
+ n->left = r;
+ n->right = l;
+ }
+ break;
+ }
+}
diff --git a/src/cmd/5c/swt.c b/src/cmd/5c/swt.c
new file mode 100644
index 000000000..7cbaadba9
--- /dev/null
+++ b/src/cmd/5c/swt.c
@@ -0,0 +1,694 @@
+// Inferno utils/5c/swt.c
+// http://code.google.com/p/inferno-os/source/browse/utils/5c/swt.c
+//
+// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
+// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
+// Portions Copyright © 1997-1999 Vita Nuova Limited
+// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
+// Portions Copyright © 2004,2006 Bruce Ellis
+// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
+// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
+// Portions Copyright © 2009 The Go Authors. All rights reserved.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+
+#include "gc.h"
+
+void
+swit1(C1 *q, int nc, int32 def, Node *n)
+{
+ C1 *r;
+ int i;
+ int32 v;
+ Prog *sp;
+
+ if(nc >= 3) {
+ i = (q+nc-1)->val - (q+0)->val;
+ if(i > 0 && i < nc*2)
+ goto direct;
+ }
+ if(nc < 5) {
+ for(i=0; i<nc; i++) {
+ if(debug['W'])
+ print("case = %.8ux\n", q->val);
+ gopcode(OEQ, nodconst(q->val), n, Z);
+ patch(p, q->label);
+ q++;
+ }
+ gbranch(OGOTO);
+ patch(p, def);
+ return;
+ }
+
+ i = nc / 2;
+ r = q+i;
+ if(debug['W'])
+ print("case > %.8ux\n", r->val);
+ gopcode(OGT, nodconst(r->val), n, Z);
+ sp = p;
+ gopcode(OEQ, nodconst(r->val), n, Z); /* just gen the B.EQ */
+ patch(p, r->label);
+ swit1(q, i, def, n);
+
+ if(debug['W'])
+ print("case < %.8ux\n", r->val);
+ patch(sp, pc);
+ swit1(r+1, nc-i-1, def, n);
+ return;
+
+direct:
+ v = q->val;
+ if(v != 0)
+ gopcode(OSUB, nodconst(v), Z, n);
+ gopcode(OCASE, nodconst((q+nc-1)->val - v), n, Z);
+ patch(p, def);
+ for(i=0; i<nc; i++) {
+ if(debug['W'])
+ print("case = %.8ux\n", q->val);
+ while(q->val != v) {
+ nextpc();
+ p->as = ABCASE;
+ patch(p, def);
+ v++;
+ }
+ nextpc();
+ p->as = ABCASE;
+ patch(p, q->label);
+ q++;
+ v++;
+ }
+ gbranch(OGOTO); /* so that regopt() won't be confused */
+ patch(p, def);
+}
+
+void
+bitload(Node *b, Node *n1, Node *n2, Node *n3, Node *nn)
+{
+ int sh;
+ int32 v;
+ Node *l;
+
+ /*
+ * n1 gets adjusted/masked value
+ * n2 gets address of cell
+ * n3 gets contents of cell
+ */
+ l = b->left;
+ if(n2 != Z) {
+ regalloc(n1, l, nn);
+ reglcgen(n2, l, Z);
+ regalloc(n3, l, Z);
+ gopcode(OAS, n2, Z, n3);
+ gopcode(OAS, n3, Z, n1);
+ } else {
+ regalloc(n1, l, nn);
+ cgen(l, n1);
+ }
+ if(b->type->shift == 0 && typeu[b->type->etype]) {
+ v = ~0 + (1L << b->type->nbits);
+ gopcode(OAND, nodconst(v), Z, n1);
+ } else {
+ sh = 32 - b->type->shift - b->type->nbits;
+ if(sh > 0)
+ gopcode(OASHL, nodconst(sh), Z, n1);
+ sh += b->type->shift;
+ if(sh > 0)
+ if(typeu[b->type->etype])
+ gopcode(OLSHR, nodconst(sh), Z, n1);
+ else
+ gopcode(OASHR, nodconst(sh), Z, n1);
+ }
+}
+
+void
+bitstore(Node *b, Node *n1, Node *n2, Node *n3, Node *nn)
+{
+ int32 v;
+ Node nod, *l;
+ int sh;
+
+ /*
+ * n1 has adjusted/masked value
+ * n2 has address of cell
+ * n3 has contents of cell
+ */
+ l = b->left;
+ regalloc(&nod, l, Z);
+ v = ~0 + (1L << b->type->nbits);
+ gopcode(OAND, nodconst(v), Z, n1);
+ gopcode(OAS, n1, Z, &nod);
+ if(nn != Z)
+ gopcode(OAS, n1, Z, nn);
+ sh = b->type->shift;
+ if(sh > 0)
+ gopcode(OASHL, nodconst(sh), Z, &nod);
+ v <<= sh;
+ gopcode(OAND, nodconst(~v), Z, n3);
+ gopcode(OOR, n3, Z, &nod);
+ gopcode(OAS, &nod, Z, n2);
+
+ regfree(&nod);
+ regfree(n1);
+ regfree(n2);
+ regfree(n3);
+}
+
+int32
+outstring(char *s, int32 n)
+{
+ int32 r;
+
+ if(suppress)
+ return nstring;
+ r = nstring;
+ while(n) {
+ string[mnstring] = *s++;
+ mnstring++;
+ nstring++;
+ if(mnstring >= NSNAME) {
+ gpseudo(ADATA, symstring, nodconst(0L));
+ p->from.offset += nstring - NSNAME;
+ p->reg = NSNAME;
+ p->to.type = D_SCONST;
+ memmove(p->to.sval, string, NSNAME);
+ mnstring = 0;
+ }
+ n--;
+ }
+ return r;
+}
+
+int
+mulcon(Node *n, Node *nn)
+{
+ Node *l, *r, nod1, nod2;
+ Multab *m;
+ int32 v, vs;
+ int o;
+ char code[sizeof(m->code)+2], *p;
+
+ if(typefd[n->type->etype])
+ return 0;
+ l = n->left;
+ r = n->right;
+ if(l->op == OCONST) {
+ l = r;
+ r = n->left;
+ }
+ if(r->op != OCONST)
+ return 0;
+ v = convvtox(r->vconst, n->type->etype);
+ if(v != r->vconst) {
+ if(debug['M'])
+ print("%L multiply conv: %lld\n", n->lineno, r->vconst);
+ return 0;
+ }
+ m = mulcon0(v);
+ if(!m) {
+ if(debug['M'])
+ print("%L multiply table: %lld\n", n->lineno, r->vconst);
+ return 0;
+ }
+ if(debug['M'] && debug['v'])
+ print("%L multiply: %d\n", n->lineno, v);
+
+ memmove(code, m->code, sizeof(m->code));
+ code[sizeof(m->code)] = 0;
+
+ p = code;
+ if(p[1] == 'i')
+ p += 2;
+ regalloc(&nod1, n, nn);
+ cgen(l, &nod1);
+ vs = v;
+ regalloc(&nod2, n, Z);
+
+loop:
+ switch(*p) {
+ case 0:
+ regfree(&nod2);
+ if(vs < 0) {
+ gopcode(OAS, &nod1, Z, &nod1);
+ gopcode(OSUB, &nod1, nodconst(0), nn);
+ } else
+ gopcode(OAS, &nod1, Z, nn);
+ regfree(&nod1);
+ return 1;
+ case '+':
+ o = OADD;
+ goto addsub;
+ case '-':
+ o = OSUB;
+ addsub: /* number is r,n,l */
+ v = p[1] - '0';
+ r = &nod1;
+ if(v&4)
+ r = &nod2;
+ n = &nod1;
+ if(v&2)
+ n = &nod2;
+ l = &nod1;
+ if(v&1)
+ l = &nod2;
+ gopcode(o, l, n, r);
+ break;
+ default: /* op is shiftcount, number is r,l */
+ v = p[1] - '0';
+ r = &nod1;
+ if(v&2)
+ r = &nod2;
+ l = &nod1;
+ if(v&1)
+ l = &nod2;
+ v = *p - 'a';
+ if(v < 0 || v >= 32) {
+ diag(n, "mulcon unknown op: %c%c", p[0], p[1]);
+ break;
+ }
+ gopcode(OASHL, nodconst(v), l, r);
+ break;
+ }
+ p += 2;
+ goto loop;
+}
+
+void
+sextern(Sym *s, Node *a, int32 o, int32 w)
+{
+ int32 e, lw;
+
+ for(e=0; e<w; e+=NSNAME) {
+ lw = NSNAME;
+ if(w-e < lw)
+ lw = w-e;
+ gpseudo(ADATA, s, nodconst(0));
+ p->from.offset += o+e;
+ p->reg = lw;
+ p->to.type = D_SCONST;
+ memmove(p->to.sval, a->cstring+e, lw);
+ }
+}
+
+void
+gextern(Sym *s, Node *a, int32 o, int32 w)
+{
+
+ if(a->op == OCONST && typev[a->type->etype]) {
+ if(isbigendian)
+ gpseudo(ADATA, s, nod32const(a->vconst>>32));
+ else
+ gpseudo(ADATA, s, nod32const(a->vconst));
+ p->from.offset += o;
+ p->reg = 4;
+ if(isbigendian)
+ gpseudo(ADATA, s, nod32const(a->vconst));
+ else
+ gpseudo(ADATA, s, nod32const(a->vconst>>32));
+ p->from.offset += o + 4;
+ p->reg = 4;
+ return;
+ }
+ gpseudo(ADATA, s, a);
+ p->from.offset += o;
+ p->reg = w;
+ if(p->to.type == D_OREG)
+ p->to.type = D_CONST;
+}
+
+void zname(Biobuf*, Sym*, int);
+char* zaddr(char*, Adr*, int);
+void zwrite(Biobuf*, Prog*, int, int);
+void outhist(Biobuf*);
+
+void
+zwrite(Biobuf *b, Prog *p, int sf, int st)
+{
+ char bf[100], *bp;
+
+ bf[0] = p->as;
+ bf[1] = p->scond;
+ bf[2] = p->reg;
+ bf[3] = p->lineno;
+ bf[4] = p->lineno>>8;
+ bf[5] = p->lineno>>16;
+ bf[6] = p->lineno>>24;
+ bp = zaddr(bf+7, &p->from, sf);
+ bp = zaddr(bp, &p->to, st);
+ Bwrite(b, bf, bp-bf);
+}
+
+void
+outcode(void)
+{
+ struct { Sym *sym; short type; } h[NSYM];
+ Prog *p;
+ Sym *s;
+ int sf, st, t, sym;
+
+ if(debug['S']) {
+ for(p = firstp; p != P; p = p->link)
+ if(p->as != ADATA && p->as != AGLOBL)
+ pc--;
+ for(p = firstp; p != P; p = p->link) {
+ print("%P\n", p);
+ if(p->as != ADATA && p->as != AGLOBL)
+ pc++;
+ }
+ }
+
+ Bprint(&outbuf, "go object %s %s %s\n", getgoos(), thestring, getgoversion());
+ if(ndynimp > 0 || ndynexp > 0) {
+ int i;
+
+ Bprint(&outbuf, "\n");
+ Bprint(&outbuf, "$$ // exports\n\n");
+ Bprint(&outbuf, "$$ // local types\n\n");
+ Bprint(&outbuf, "$$ // dynimport\n");
+ for(i=0; i<ndynimp; i++)
+ Bprint(&outbuf, "dynimport %s %s %s\n", dynimp[i].local, dynimp[i].remote, dynimp[i].path);
+ Bprint(&outbuf, "\n$$ // dynexport\n");
+ for(i=0; i<ndynexp; i++)
+ Bprint(&outbuf, "dynexport %s %s\n", dynexp[i].local, dynexp[i].remote);
+ Bprint(&outbuf, "\n$$\n\n");
+ }
+ Bprint(&outbuf, "!\n");
+
+ outhist(&outbuf);
+ for(sym=0; sym<NSYM; sym++) {
+ h[sym].sym = S;
+ h[sym].type = 0;
+ }
+ sym = 1;
+ for(p = firstp; p != P; p = p->link) {
+ jackpot:
+ sf = 0;
+ s = p->from.sym;
+ while(s != S) {
+ sf = s->sym;
+ if(sf < 0 || sf >= NSYM)
+ sf = 0;
+ t = p->from.name;
+ if(h[sf].type == t)
+ if(h[sf].sym == s)
+ break;
+ s->sym = sym;
+ zname(&outbuf, s, t);
+ h[sym].sym = s;
+ h[sym].type = t;
+ sf = sym;
+ sym++;
+ if(sym >= NSYM)
+ sym = 1;
+ break;
+ }
+ st = 0;
+ s = p->to.sym;
+ while(s != S) {
+ st = s->sym;
+ if(st < 0 || st >= NSYM)
+ st = 0;
+ t = p->to.name;
+ if(h[st].type == t)
+ if(h[st].sym == s)
+ break;
+ s->sym = sym;
+ zname(&outbuf, s, t);
+ h[sym].sym = s;
+ h[sym].type = t;
+ st = sym;
+ sym++;
+ if(sym >= NSYM)
+ sym = 1;
+ if(st == sf)
+ goto jackpot;
+ break;
+ }
+ zwrite(&outbuf, p, sf, st);
+ }
+ firstp = P;
+ lastp = P;
+}
+
+void
+outhist(Biobuf *b)
+{
+ Hist *h;
+ char *p, *q, *op, c;
+ Prog pg;
+ int n;
+
+ pg = zprog;
+ pg.as = AHISTORY;
+ c = pathchar();
+ for(h = hist; h != H; h = h->link) {
+ p = h->name;
+ op = 0;
+ /* on windows skip drive specifier in pathname */
+ if(systemtype(Windows) && p && p[1] == ':'){
+ p += 2;
+ c = *p;
+ }
+ if(p && p[0] != c && h->offset == 0 && pathname){
+ /* on windows skip drive specifier in pathname */
+ if(systemtype(Windows) && pathname[1] == ':') {
+ op = p;
+ p = pathname+2;
+ c = *p;
+ } else if(pathname[0] == c){
+ op = p;
+ p = pathname;
+ }
+ }
+ while(p) {
+ q = utfrune(p, c);
+ if(q) {
+ n = q-p;
+ if(n == 0){
+ n = 1; /* leading "/" */
+ *p = '/'; /* don't emit "\" on windows */
+ }
+ q++;
+ } else {
+ n = strlen(p);
+ q = 0;
+ }
+ if(n) {
+ Bputc(b, ANAME);
+ Bputc(b, D_FILE);
+ Bputc(b, 1);
+ Bputc(b, '<');
+ Bwrite(b, p, n);
+ Bputc(b, 0);
+ }
+ p = q;
+ if(p == 0 && op) {
+ p = op;
+ op = 0;
+ }
+ }
+ pg.lineno = h->line;
+ pg.to.type = zprog.to.type;
+ pg.to.offset = h->offset;
+ if(h->offset)
+ pg.to.type = D_CONST;
+
+ zwrite(b, &pg, 0, 0);
+ }
+}
+
+void
+zname(Biobuf *b, Sym *s, int t)
+{
+ char *n, bf[7];
+ uint32 sig;
+
+ n = s->name;
+ if(debug['T'] && t == D_EXTERN && s->sig != SIGDONE && s->type != types[TENUM] && s != symrathole){
+ sig = sign(s);
+ bf[0] = ASIGNAME;
+ bf[1] = sig;
+ bf[2] = sig>>8;
+ bf[3] = sig>>16;
+ bf[4] = sig>>24;
+ bf[5] = t;
+ bf[6] = s->sym;
+ Bwrite(b, bf, 7);
+ s->sig = SIGDONE;
+ }
+ else{
+ bf[0] = ANAME;
+ bf[1] = t; /* type */
+ bf[2] = s->sym; /* sym */
+ Bwrite(b, bf, 3);
+ }
+ Bwrite(b, n, strlen(n)+1);
+}
+
+char*
+zaddr(char *bp, Adr *a, int s)
+{
+ int32 l;
+ Ieee e;
+
+ bp[0] = a->type;
+ bp[1] = a->reg;
+ bp[2] = s;
+ bp[3] = a->name;
+ bp += 4;
+ switch(a->type) {
+ default:
+ diag(Z, "unknown type %d in zaddr", a->type);
+
+ case D_NONE:
+ case D_REG:
+ case D_FREG:
+ case D_PSR:
+ break;
+
+ case D_CONST2:
+ l = a->offset2;
+ bp[0] = l;
+ bp[1] = l>>8;
+ bp[2] = l>>16;
+ bp[3] = l>>24;
+ bp += 4; // fall through
+ case D_OREG:
+ case D_CONST:
+ case D_BRANCH:
+ case D_SHIFT:
+ l = a->offset;
+ bp[0] = l;
+ bp[1] = l>>8;
+ bp[2] = l>>16;
+ bp[3] = l>>24;
+ bp += 4;
+ break;
+
+ case D_SCONST:
+ memmove(bp, a->sval, NSNAME);
+ bp += NSNAME;
+ break;
+
+ case D_FCONST:
+ ieeedtod(&e, a->dval);
+ l = e.l;
+ bp[0] = l;
+ bp[1] = l>>8;
+ bp[2] = l>>16;
+ bp[3] = l>>24;
+ bp += 4;
+ l = e.h;
+ bp[0] = l;
+ bp[1] = l>>8;
+ bp[2] = l>>16;
+ bp[3] = l>>24;
+ bp += 4;
+ break;
+ }
+ return bp;
+}
+
+int32
+align(int32 i, Type *t, int op, int32 *maxalign)
+{
+ int32 o;
+ Type *v;
+ int w;
+
+ o = i;
+ w = 1;
+ switch(op) {
+ default:
+ diag(Z, "unknown align opcode %d", op);
+ break;
+
+ case Asu2: /* padding at end of a struct */
+ w = *maxalign;
+ if(w < 1)
+ w = 1;
+ if(packflg)
+ w = packflg;
+ break;
+
+ case Ael1: /* initial align of struct element */
+ for(v=t; v->etype==TARRAY; v=v->link)
+ ;
+ if(v->etype == TSTRUCT || v->etype == TUNION)
+ w = v->align;
+ else {
+ w = ewidth[v->etype];
+ if(w == 8)
+ w = 4;
+ }
+ if(w < 1 || w > SZ_LONG)
+ fatal(Z, "align");
+ if(packflg)
+ w = packflg;
+ break;
+
+ case Ael2: /* width of a struct element */
+ o += t->width;
+ break;
+
+ case Aarg0: /* initial passbyptr argument in arg list */
+ if(typesuv[t->etype]) {
+ o = align(o, types[TIND], Aarg1, nil);
+ o = align(o, types[TIND], Aarg2, nil);
+ }
+ break;
+
+ case Aarg1: /* initial align of parameter */
+ w = ewidth[t->etype];
+ if(w <= 0 || w >= SZ_LONG) {
+ w = SZ_LONG;
+ break;
+ }
+ w = 1; /* little endian no adjustment */
+ break;
+
+ case Aarg2: /* width of a parameter */
+ o += t->width;
+ w = t->width;
+ if(w > SZ_LONG)
+ w = SZ_LONG;
+ break;
+
+ case Aaut3: /* total align of automatic */
+ o = align(o, t, Ael2, nil);
+ o = align(o, t, Ael1, nil);
+ w = SZ_LONG; /* because of a pun in cc/dcl.c:contig() */
+ break;
+ }
+ o = xround(o, w);
+ if(maxalign != nil && *maxalign < w)
+ *maxalign = w;
+ if(debug['A'])
+ print("align %s %d %T = %d\n", bnames[op], i, t, o);
+ return o;
+}
+
+int32
+maxround(int32 max, int32 v)
+{
+ v = xround(v, SZ_LONG);
+ if(v > max)
+ return v;
+ return max;
+}
diff --git a/src/cmd/5c/txt.c b/src/cmd/5c/txt.c
new file mode 100644
index 000000000..a32387bc1
--- /dev/null
+++ b/src/cmd/5c/txt.c
@@ -0,0 +1,1298 @@
+// Inferno utils/5c/txt.c
+// http://code.google.com/p/inferno-os/source/browse/utils/5c/txt.c
+//
+// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
+// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
+// Portions Copyright © 1997-1999 Vita Nuova Limited
+// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
+// Portions Copyright © 2004,2006 Bruce Ellis
+// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
+// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
+// Portions Copyright © 2009 The Go Authors. All rights reserved.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+
+#include "gc.h"
+
+void
+ginit(void)
+{
+ Type *t;
+
+ thechar = '5';
+ thestring = "arm";
+ exregoffset = REGEXT;
+ exfregoffset = FREGEXT;
+ listinit();
+ nstring = 0;
+ mnstring = 0;
+ nrathole = 0;
+ pc = 0;
+ breakpc = -1;
+ continpc = -1;
+ cases = C;
+ firstp = P;
+ lastp = P;
+ tfield = types[TLONG];
+
+ zprog.link = P;
+ zprog.as = AGOK;
+ zprog.reg = NREG;
+ zprog.from.type = D_NONE;
+ zprog.from.name = D_NONE;
+ zprog.from.reg = NREG;
+ zprog.to = zprog.from;
+ zprog.scond = 0xE;
+
+ regnode.op = OREGISTER;
+ regnode.class = CEXREG;
+ regnode.reg = REGTMP;
+ regnode.complex = 0;
+ regnode.addable = 11;
+ regnode.type = types[TLONG];
+
+ constnode.op = OCONST;
+ constnode.class = CXXX;
+ constnode.complex = 0;
+ constnode.addable = 20;
+ constnode.type = types[TLONG];
+
+ fconstnode.op = OCONST;
+ fconstnode.class = CXXX;
+ fconstnode.complex = 0;
+ fconstnode.addable = 20;
+ fconstnode.type = types[TDOUBLE];
+
+ nodsafe = new(ONAME, Z, Z);
+ nodsafe->sym = slookup(".safe");
+ nodsafe->type = types[TINT];
+ nodsafe->etype = types[TINT]->etype;
+ nodsafe->class = CAUTO;
+ complex(nodsafe);
+
+ t = typ(TARRAY, types[TCHAR]);
+ symrathole = slookup(".rathole");
+ symrathole->class = CGLOBL;
+ symrathole->type = t;
+
+ nodrat = new(ONAME, Z, Z);
+ nodrat->sym = symrathole;
+ nodrat->type = types[TIND];
+ nodrat->etype = TVOID;
+ nodrat->class = CGLOBL;
+ complex(nodrat);
+ nodrat->type = t;
+
+ nodret = new(ONAME, Z, Z);
+ nodret->sym = slookup(".ret");
+ nodret->type = types[TIND];
+ nodret->etype = TIND;
+ nodret->class = CPARAM;
+ nodret = new(OIND, nodret, Z);
+ complex(nodret);
+
+ com64init();
+
+ memset(reg, 0, sizeof(reg));
+}
+
+void
+gclean(void)
+{
+ int i;
+ Sym *s;
+
+ for(i=0; i<NREG; i++)
+ if(reg[i])
+ diag(Z, "reg %d left allocated", i);
+ for(i=NREG; i<NREG+NFREG; i++)
+ if(reg[i])
+ diag(Z, "freg %d left allocated", i-NREG);
+ while(mnstring)
+ outstring("", 1L);
+ symstring->type->width = nstring;
+ symrathole->type->width = nrathole;
+ for(i=0; i<NHASH; i++)
+ for(s = hash[i]; s != S; s = s->link) {
+ if(s->type == T)
+ continue;
+ if(s->type->width == 0)
+ continue;
+ if(s->class != CGLOBL && s->class != CSTATIC)
+ continue;
+ if(s->type == types[TENUM])
+ continue;
+ gpseudo(AGLOBL, s, nodconst(s->type->width));
+ }
+ nextpc();
+ p->as = AEND;
+ outcode();
+}
+
+void
+nextpc(void)
+{
+
+ p = alloc(sizeof(*p));
+ *p = zprog;
+ p->lineno = nearln;
+ pc++;
+ if(firstp == P) {
+ firstp = p;
+ lastp = p;
+ return;
+ }
+ lastp->link = p;
+ lastp = p;
+}
+
+void
+gargs(Node *n, Node *tn1, Node *tn2)
+{
+ int32 regs;
+ Node fnxargs[20], *fnxp;
+
+ regs = cursafe;
+
+ fnxp = fnxargs;
+ garg1(n, tn1, tn2, 0, &fnxp); /* compile fns to temps */
+
+ curarg = 0;
+ fnxp = fnxargs;
+ garg1(n, tn1, tn2, 1, &fnxp); /* compile normal args and temps */
+
+ cursafe = regs;
+}
+
+void
+garg1(Node *n, Node *tn1, Node *tn2, int f, Node **fnxp)
+{
+ Node nod;
+
+ if(n == Z)
+ return;
+ if(n->op == OLIST) {
+ garg1(n->left, tn1, tn2, f, fnxp);
+ garg1(n->right, tn1, tn2, f, fnxp);
+ return;
+ }
+ if(f == 0) {
+ if(n->complex >= FNX) {
+ regsalloc(*fnxp, n);
+ nod = znode;
+ nod.op = OAS;
+ nod.left = *fnxp;
+ nod.right = n;
+ nod.type = n->type;
+ cgen(&nod, Z);
+ (*fnxp)++;
+ }
+ return;
+ }
+ if(typesuv[n->type->etype]) {
+ regaalloc(tn2, n);
+ if(n->complex >= FNX) {
+ sugen(*fnxp, tn2, n->type->width);
+ (*fnxp)++;
+ } else
+ sugen(n, tn2, n->type->width);
+ return;
+ }
+ if(REGARG >= 0 && curarg == 0 && typechlp[n->type->etype]) {
+ regaalloc1(tn1, n);
+ if(n->complex >= FNX) {
+ cgen(*fnxp, tn1);
+ (*fnxp)++;
+ } else
+ cgen(n, tn1);
+ return;
+ }
+ regalloc(tn1, n, Z);
+ if(n->complex >= FNX) {
+ cgen(*fnxp, tn1);
+ (*fnxp)++;
+ } else
+ cgen(n, tn1);
+ regaalloc(tn2, n);
+ gopcode(OAS, tn1, Z, tn2);
+ regfree(tn1);
+}
+
+Node*
+nodconst(int32 v)
+{
+ constnode.vconst = v;
+ return &constnode;
+}
+
+Node*
+nod32const(vlong v)
+{
+ constnode.vconst = v & MASK(32);
+ return &constnode;
+}
+
+Node*
+nodfconst(double d)
+{
+ fconstnode.fconst = d;
+ return &fconstnode;
+}
+
+void
+nodreg(Node *n, Node *nn, int reg)
+{
+ *n = regnode;
+ n->reg = reg;
+ n->type = nn->type;
+ n->lineno = nn->lineno;
+}
+
+void
+regret(Node *n, Node *nn)
+{
+ int r;
+
+ r = REGRET;
+ if(typefd[nn->type->etype])
+ r = FREGRET+NREG;
+ nodreg(n, nn, r);
+ reg[r]++;
+}
+
+int
+tmpreg(void)
+{
+ int i;
+
+ for(i=REGRET+1; i<NREG; i++)
+ if(reg[i] == 0)
+ return i;
+ diag(Z, "out of fixed registers");
+ return 0;
+}
+
+void
+regalloc(Node *n, Node *tn, Node *o)
+{
+ int i;
+
+ switch(tn->type->etype) {
+ case TCHAR:
+ case TUCHAR:
+ case TSHORT:
+ case TUSHORT:
+ case TINT:
+ case TUINT:
+ case TLONG:
+ case TULONG:
+ case TIND:
+ if(o != Z && o->op == OREGISTER) {
+ i = o->reg;
+ if(i >= 0 && i < NREG)
+ goto out;
+ }
+ for(i=REGRET+1; i<=REGEXT-2; i++)
+ if(reg[i] == 0)
+ goto out;
+ diag(tn, "out of fixed registers");
+ goto err;
+
+ case TFLOAT:
+ case TDOUBLE:
+ case TVLONG:
+ if(o != Z && o->op == OREGISTER) {
+ i = o->reg;
+ if(i >= NREG && i < NREG+NFREG)
+ goto out;
+ }
+ for(i=NREG; i<NREG+NFREG; i++)
+ if(reg[i] == 0)
+ goto out;
+ diag(tn, "out of float registers");
+ goto err;
+ }
+ diag(tn, "unknown type in regalloc: %T", tn->type);
+err:
+ nodreg(n, tn, 0);
+ return;
+out:
+ reg[i]++;
+ nodreg(n, tn, i);
+}
+
+void
+regialloc(Node *n, Node *tn, Node *o)
+{
+ Node nod;
+
+ nod = *tn;
+ nod.type = types[TIND];
+ regalloc(n, &nod, o);
+}
+
+void
+regfree(Node *n)
+{
+ int i;
+
+ i = 0;
+ if(n->op != OREGISTER && n->op != OINDREG)
+ goto err;
+ i = n->reg;
+ if(i < 0 || i >= sizeof(reg))
+ goto err;
+ if(reg[i] <= 0)
+ goto err;
+ reg[i]--;
+ return;
+err:
+ diag(n, "error in regfree: %d", i);
+}
+
+void
+regsalloc(Node *n, Node *nn)
+{
+ cursafe = align(cursafe, nn->type, Aaut3, nil);
+ maxargsafe = maxround(maxargsafe, cursafe+curarg);
+ *n = *nodsafe;
+ n->xoffset = -(stkoff + cursafe);
+ n->type = nn->type;
+ n->etype = nn->type->etype;
+ n->lineno = nn->lineno;
+}
+
+void
+regaalloc1(Node *n, Node *nn)
+{
+ if(REGARG < 0) {
+ fatal(n, "regaalloc1 and REGARG<0");
+ return;
+ }
+ nodreg(n, nn, REGARG);
+ reg[REGARG]++;
+ curarg = align(curarg, nn->type, Aarg1, nil);
+ curarg = align(curarg, nn->type, Aarg2, nil);
+ maxargsafe = maxround(maxargsafe, cursafe+curarg);
+}
+
+void
+regaalloc(Node *n, Node *nn)
+{
+ curarg = align(curarg, nn->type, Aarg1, nil);
+ *n = *nn;
+ n->op = OINDREG;
+ n->reg = REGSP;
+ n->xoffset = curarg + SZ_LONG;
+ n->complex = 0;
+ n->addable = 20;
+ curarg = align(curarg, nn->type, Aarg2, nil);
+ maxargsafe = maxround(maxargsafe, cursafe+curarg);
+}
+
+void
+regind(Node *n, Node *nn)
+{
+
+ if(n->op != OREGISTER) {
+ diag(n, "regind not OREGISTER");
+ return;
+ }
+ n->op = OINDREG;
+ n->type = nn->type;
+}
+
+void
+raddr(Node *n, Prog *p)
+{
+ Adr a;
+
+ naddr(n, &a);
+ if(R0ISZERO && a.type == D_CONST && a.offset == 0) {
+ a.type = D_REG;
+ a.reg = 0;
+ }
+ if(a.type != D_REG && a.type != D_FREG) {
+ if(n)
+ diag(n, "bad in raddr: %O", n->op);
+ else
+ diag(n, "bad in raddr: <null>");
+ p->reg = NREG;
+ } else
+ p->reg = a.reg;
+}
+
+void
+naddr(Node *n, Adr *a)
+{
+ int32 v;
+
+ a->type = D_NONE;
+ if(n == Z)
+ return;
+ switch(n->op) {
+ default:
+ bad:
+ diag(n, "bad in naddr: %O", n->op);
+ break;
+
+ case OREGISTER:
+ a->type = D_REG;
+ a->sym = S;
+ a->reg = n->reg;
+ if(a->reg >= NREG) {
+ a->type = D_FREG;
+ a->reg -= NREG;
+ }
+ break;
+
+ case OIND:
+ naddr(n->left, a);
+ if(a->type == D_REG) {
+ a->type = D_OREG;
+ break;
+ }
+ if(a->type == D_CONST) {
+ a->type = D_OREG;
+ break;
+ }
+ goto bad;
+
+ case OINDREG:
+ a->type = D_OREG;
+ a->sym = S;
+ a->offset = n->xoffset;
+ a->reg = n->reg;
+ break;
+
+ case ONAME:
+ a->etype = n->etype;
+ a->type = D_OREG;
+ a->name = D_STATIC;
+ a->sym = n->sym;
+ a->offset = n->xoffset;
+ if(n->class == CSTATIC)
+ break;
+ if(n->class == CEXTERN || n->class == CGLOBL) {
+ a->name = D_EXTERN;
+ break;
+ }
+ if(n->class == CAUTO) {
+ a->name = D_AUTO;
+ break;
+ }
+ if(n->class == CPARAM) {
+ a->name = D_PARAM;
+ break;
+ }
+ goto bad;
+
+ case OCONST:
+ a->sym = S;
+ a->reg = NREG;
+ if(typefd[n->type->etype]) {
+ a->type = D_FCONST;
+ a->dval = n->fconst;
+ } else {
+ a->type = D_CONST;
+ a->offset = n->vconst;
+ }
+ break;
+
+ case OADDR:
+ naddr(n->left, a);
+ if(a->type == D_OREG) {
+ a->type = D_CONST;
+ break;
+ }
+ goto bad;
+
+ case OADD:
+ if(n->left->op == OCONST) {
+ naddr(n->left, a);
+ v = a->offset;
+ naddr(n->right, a);
+ } else {
+ naddr(n->right, a);
+ v = a->offset;
+ naddr(n->left, a);
+ }
+ a->offset += v;
+ break;
+
+ }
+}
+
+void
+fop(int as, int f1, int f2, Node *t)
+{
+ Node nod1, nod2, nod3;
+
+ nodreg(&nod1, t, NREG+f1);
+ nodreg(&nod2, t, NREG+f2);
+ regalloc(&nod3, t, t);
+ gopcode(as, &nod1, &nod2, &nod3);
+ gmove(&nod3, t);
+ regfree(&nod3);
+}
+
+void
+gmovm(Node *f, Node *t, int w)
+{
+ gins(AMOVM, f, t);
+ p->scond |= C_UBIT;
+ if(w)
+ p->scond |= C_WBIT;
+}
+
+void
+gmove(Node *f, Node *t)
+{
+ int ft, tt, a;
+ Node nod, nod1;
+ Prog *p1;
+
+ ft = f->type->etype;
+ tt = t->type->etype;
+
+ if(ft == TDOUBLE && f->op == OCONST) {
+ }
+ if(ft == TFLOAT && f->op == OCONST) {
+ }
+
+ /*
+ * a load --
+ * put it into a register then
+ * worry what to do with it.
+ */
+ if(f->op == ONAME || f->op == OINDREG || f->op == OIND) {
+ switch(ft) {
+ default:
+ a = AMOVW;
+ break;
+ case TFLOAT:
+ a = AMOVF;
+ break;
+ case TDOUBLE:
+ a = AMOVD;
+ break;
+ case TCHAR:
+ a = AMOVB;
+ break;
+ case TUCHAR:
+ a = AMOVBU;
+ break;
+ case TSHORT:
+ a = AMOVH;
+ break;
+ case TUSHORT:
+ a = AMOVHU;
+ break;
+ }
+ if(typechlp[ft] && typeilp[tt])
+ regalloc(&nod, t, t);
+ else
+ regalloc(&nod, f, t);
+ gins(a, f, &nod);
+ gmove(&nod, t);
+ regfree(&nod);
+ return;
+ }
+
+ /*
+ * a store --
+ * put it into a register then
+ * store it.
+ */
+ if(t->op == ONAME || t->op == OINDREG || t->op == OIND) {
+ switch(tt) {
+ default:
+ a = AMOVW;
+ break;
+ case TUCHAR:
+ a = AMOVBU;
+ break;
+ case TCHAR:
+ a = AMOVB;
+ break;
+ case TUSHORT:
+ a = AMOVHU;
+ break;
+ case TSHORT:
+ a = AMOVH;
+ break;
+ case TFLOAT:
+ a = AMOVF;
+ break;
+ case TVLONG:
+ case TDOUBLE:
+ a = AMOVD;
+ break;
+ }
+ if(ft == tt)
+ regalloc(&nod, t, f);
+ else
+ regalloc(&nod, t, Z);
+ gmove(f, &nod);
+ gins(a, &nod, t);
+ regfree(&nod);
+ return;
+ }
+
+ /*
+ * type x type cross table
+ */
+ a = AGOK;
+ switch(ft) {
+ case TDOUBLE:
+ case TVLONG:
+ case TFLOAT:
+ switch(tt) {
+ case TDOUBLE:
+ case TVLONG:
+ a = AMOVD;
+ if(ft == TFLOAT)
+ a = AMOVFD;
+ break;
+ case TFLOAT:
+ a = AMOVDF;
+ if(ft == TFLOAT)
+ a = AMOVF;
+ break;
+ case TINT:
+ case TUINT:
+ case TLONG:
+ case TULONG:
+ case TIND:
+ a = AMOVDW;
+ if(ft == TFLOAT)
+ a = AMOVFW;
+ break;
+ case TSHORT:
+ case TUSHORT:
+ case TCHAR:
+ case TUCHAR:
+ a = AMOVDW;
+ if(ft == TFLOAT)
+ a = AMOVFW;
+ break;
+ }
+ break;
+ case TUINT:
+ case TULONG:
+ if(tt == TFLOAT || tt == TDOUBLE) {
+ // ugly and probably longer than necessary,
+ // but vfp has a single instruction for this,
+ // so hopefully it won't last long.
+ //
+ // tmp = f
+ // tmp1 = tmp & 0x80000000
+ // tmp ^= tmp1
+ // t = float(int32(tmp))
+ // if(tmp1)
+ // t += 2147483648.
+ //
+ regalloc(&nod, f, Z);
+ regalloc(&nod1, f, Z);
+ gins(AMOVW, f, &nod);
+ gins(AMOVW, &nod, &nod1);
+ gins(AAND, nodconst(0x80000000), &nod1);
+ gins(AEOR, &nod1, &nod);
+ if(tt == TFLOAT)
+ gins(AMOVWF, &nod, t);
+ else
+ gins(AMOVWD, &nod, t);
+ gins(ACMP, nodconst(0), Z);
+ raddr(&nod1, p);
+ gins(ABEQ, Z, Z);
+ regfree(&nod);
+ regfree(&nod1);
+ p1 = p;
+ regalloc(&nod, t, Z);
+ gins(AMOVF, nodfconst(2147483648.), &nod);
+ gins(AADDF, &nod, t);
+ regfree(&nod);
+ patch(p1, pc);
+ return;
+ }
+ // fall through
+
+ case TINT:
+ case TLONG:
+ case TIND:
+ switch(tt) {
+ case TDOUBLE:
+ gins(AMOVWD, f, t);
+ return;
+ case TFLOAT:
+ gins(AMOVWF, f, t);
+ return;
+ case TINT:
+ case TUINT:
+ case TLONG:
+ case TULONG:
+ case TIND:
+ case TSHORT:
+ case TUSHORT:
+ case TCHAR:
+ case TUCHAR:
+ a = AMOVW;
+ break;
+ }
+ break;
+ case TSHORT:
+ switch(tt) {
+ case TDOUBLE:
+ regalloc(&nod, f, Z);
+ gins(AMOVH, f, &nod);
+ gins(AMOVWD, &nod, t);
+ regfree(&nod);
+ return;
+ case TFLOAT:
+ regalloc(&nod, f, Z);
+ gins(AMOVH, f, &nod);
+ gins(AMOVWF, &nod, t);
+ regfree(&nod);
+ return;
+ case TUINT:
+ case TINT:
+ case TULONG:
+ case TLONG:
+ case TIND:
+ a = AMOVH;
+ break;
+ case TSHORT:
+ case TUSHORT:
+ case TCHAR:
+ case TUCHAR:
+ a = AMOVW;
+ break;
+ }
+ break;
+ case TUSHORT:
+ switch(tt) {
+ case TDOUBLE:
+ regalloc(&nod, f, Z);
+ gins(AMOVHU, f, &nod);
+ gins(AMOVWD, &nod, t);
+ regfree(&nod);
+ return;
+ case TFLOAT:
+ regalloc(&nod, f, Z);
+ gins(AMOVHU, f, &nod);
+ gins(AMOVWF, &nod, t);
+ regfree(&nod);
+ return;
+ case TINT:
+ case TUINT:
+ case TLONG:
+ case TULONG:
+ case TIND:
+ a = AMOVHU;
+ break;
+ case TSHORT:
+ case TUSHORT:
+ case TCHAR:
+ case TUCHAR:
+ a = AMOVW;
+ break;
+ }
+ break;
+ case TCHAR:
+ switch(tt) {
+ case TDOUBLE:
+ regalloc(&nod, f, Z);
+ gins(AMOVB, f, &nod);
+ gins(AMOVWD, &nod, t);
+ regfree(&nod);
+ return;
+ case TFLOAT:
+ regalloc(&nod, f, Z);
+ gins(AMOVB, f, &nod);
+ gins(AMOVWF, &nod, t);
+ regfree(&nod);
+ return;
+ case TINT:
+ case TUINT:
+ case TLONG:
+ case TULONG:
+ case TIND:
+ case TSHORT:
+ case TUSHORT:
+ a = AMOVB;
+ break;
+ case TCHAR:
+ case TUCHAR:
+ a = AMOVW;
+ break;
+ }
+ break;
+ case TUCHAR:
+ switch(tt) {
+ case TDOUBLE:
+ regalloc(&nod, f, Z);
+ gins(AMOVBU, f, &nod);
+ gins(AMOVWD, &nod, t);
+ regfree(&nod);
+ return;
+ case TFLOAT:
+ regalloc(&nod, f, Z);
+ gins(AMOVBU, f, &nod);
+ gins(AMOVWF, &nod, t);
+ regfree(&nod);
+ return;
+ case TINT:
+ case TUINT:
+ case TLONG:
+ case TULONG:
+ case TIND:
+ case TSHORT:
+ case TUSHORT:
+ a = AMOVBU;
+ break;
+ case TCHAR:
+ case TUCHAR:
+ a = AMOVW;
+ break;
+ }
+ break;
+ }
+ if(a == AGOK)
+ diag(Z, "bad opcode in gmove %T -> %T", f->type, t->type);
+ if(a == AMOVW || a == AMOVF || a == AMOVD)
+ if(samaddr(f, t))
+ return;
+ gins(a, f, t);
+}
+
+void
+gmover(Node *f, Node *t)
+{
+ int ft, tt, a;
+
+ ft = f->type->etype;
+ tt = t->type->etype;
+ a = AGOK;
+ if(typechlp[ft] && typechlp[tt] && ewidth[ft] >= ewidth[tt]){
+ switch(tt){
+ case TSHORT:
+ a = AMOVH;
+ break;
+ case TUSHORT:
+ a = AMOVHU;
+ break;
+ case TCHAR:
+ a = AMOVB;
+ break;
+ case TUCHAR:
+ a = AMOVBU;
+ break;
+ }
+ }
+ if(a == AGOK)
+ gmove(f, t);
+ else
+ gins(a, f, t);
+}
+
+void
+gins(int a, Node *f, Node *t)
+{
+
+ nextpc();
+ p->as = a;
+ if(f != Z)
+ naddr(f, &p->from);
+ if(t != Z)
+ naddr(t, &p->to);
+ if(debug['g'])
+ print("%P\n", p);
+}
+
+void
+gopcode(int o, Node *f1, Node *f2, Node *t)
+{
+ int a, et;
+ Adr ta;
+
+ et = TLONG;
+ if(f1 != Z && f1->type != T)
+ et = f1->type->etype;
+ a = AGOK;
+ switch(o) {
+ case OAS:
+ gmove(f1, t);
+ return;
+
+ case OASADD:
+ case OADD:
+ a = AADD;
+ if(et == TFLOAT)
+ a = AADDF;
+ else
+ if(et == TDOUBLE || et == TVLONG)
+ a = AADDD;
+ break;
+
+ case OASSUB:
+ case OSUB:
+ if(f2 && f2->op == OCONST) {
+ Node *t = f1;
+ f1 = f2;
+ f2 = t;
+ a = ARSB;
+ } else
+ a = ASUB;
+ if(et == TFLOAT)
+ a = ASUBF;
+ else
+ if(et == TDOUBLE || et == TVLONG)
+ a = ASUBD;
+ break;
+
+ case OASOR:
+ case OOR:
+ a = AORR;
+ break;
+
+ case OASAND:
+ case OAND:
+ a = AAND;
+ break;
+
+ case OASXOR:
+ case OXOR:
+ a = AEOR;
+ break;
+
+ case OASLSHR:
+ case OLSHR:
+ a = ASRL;
+ break;
+
+ case OASASHR:
+ case OASHR:
+ a = ASRA;
+ break;
+
+ case OASASHL:
+ case OASHL:
+ a = ASLL;
+ break;
+
+ case OFUNC:
+ a = ABL;
+ break;
+
+ case OASMUL:
+ case OMUL:
+ a = AMUL;
+ if(et == TFLOAT)
+ a = AMULF;
+ else
+ if(et == TDOUBLE || et == TVLONG)
+ a = AMULD;
+ break;
+
+ case OASDIV:
+ case ODIV:
+ a = ADIV;
+ if(et == TFLOAT)
+ a = ADIVF;
+ else
+ if(et == TDOUBLE || et == TVLONG)
+ a = ADIVD;
+ break;
+
+ case OASMOD:
+ case OMOD:
+ a = AMOD;
+ break;
+
+ case OASLMUL:
+ case OLMUL:
+ a = AMULU;
+ break;
+
+ case OASLMOD:
+ case OLMOD:
+ a = AMODU;
+ break;
+
+ case OASLDIV:
+ case OLDIV:
+ a = ADIVU;
+ break;
+
+ case OCASE:
+ case OEQ:
+ case ONE:
+ case OLT:
+ case OLE:
+ case OGE:
+ case OGT:
+ case OLO:
+ case OLS:
+ case OHS:
+ case OHI:
+ a = ACMP;
+ if(et == TFLOAT)
+ a = ACMPF;
+ else
+ if(et == TDOUBLE || et == TVLONG)
+ a = ACMPD;
+ nextpc();
+ p->as = a;
+ naddr(f1, &p->from);
+ if(a == ACMP && f1->op == OCONST && p->from.offset < 0) {
+ p->as = ACMN;
+ p->from.offset = -p->from.offset;
+ }
+ raddr(f2, p);
+ switch(o) {
+ case OEQ:
+ a = ABEQ;
+ break;
+ case ONE:
+ a = ABNE;
+ break;
+ case OLT:
+ a = ABLT;
+ break;
+ case OLE:
+ a = ABLE;
+ break;
+ case OGE:
+ a = ABGE;
+ break;
+ case OGT:
+ a = ABGT;
+ break;
+ case OLO:
+ a = ABLO;
+ break;
+ case OLS:
+ a = ABLS;
+ break;
+ case OHS:
+ a = ABHS;
+ break;
+ case OHI:
+ a = ABHI;
+ break;
+ case OCASE:
+ nextpc();
+ p->as = ACASE;
+ p->scond = 0x9;
+ naddr(f2, &p->from);
+ a = ABHI;
+ break;
+ }
+ f1 = Z;
+ f2 = Z;
+ break;
+ }
+ if(a == AGOK)
+ diag(Z, "bad in gopcode %O", o);
+ nextpc();
+ p->as = a;
+ if(f1 != Z)
+ naddr(f1, &p->from);
+ if(f2 != Z) {
+ naddr(f2, &ta);
+ p->reg = ta.reg;
+ }
+ if(t != Z)
+ naddr(t, &p->to);
+ if(debug['g'])
+ print("%P\n", p);
+}
+
+int
+samaddr(Node *f, Node *t)
+{
+
+ if(f->op != t->op)
+ return 0;
+ switch(f->op) {
+
+ case OREGISTER:
+ if(f->reg != t->reg)
+ break;
+ return 1;
+ }
+ return 0;
+}
+
+void
+gbranch(int o)
+{
+ int a;
+
+ a = AGOK;
+ switch(o) {
+ case ORETURN:
+ a = ARET;
+ break;
+ case OGOTO:
+ a = AB;
+ break;
+ }
+ nextpc();
+ if(a == AGOK) {
+ diag(Z, "bad in gbranch %O", o);
+ nextpc();
+ }
+ p->as = a;
+}
+
+void
+patch(Prog *op, int32 pc)
+{
+
+ op->to.offset = pc;
+ op->to.type = D_BRANCH;
+}
+
+void
+gpseudo(int a, Sym *s, Node *n)
+{
+
+ nextpc();
+ p->as = a;
+ p->from.type = D_OREG;
+ p->from.sym = s;
+ p->from.name = D_EXTERN;
+ if(a == ATEXT) {
+ p->reg = textflag;
+ textflag = 0;
+ }
+ if(s->class == CSTATIC)
+ p->from.name = D_STATIC;
+ naddr(n, &p->to);
+ if(a == ADATA || a == AGLOBL)
+ pc--;
+}
+
+int
+sconst(Node *n)
+{
+ vlong vv;
+
+ if(n->op == OCONST) {
+ if(!typefd[n->type->etype]) {
+ vv = n->vconst;
+ if(vv >= (vlong)(-32766) && vv < (vlong)32766)
+ return 1;
+ /*
+ * should be specialised for constant values which will
+ * fit in different instructionsl; for now, let 5l
+ * sort it out
+ */
+ return 1;
+ }
+ }
+ return 0;
+}
+
+int
+sval(int32 v)
+{
+ int i;
+
+ for(i=0; i<16; i++) {
+ if((v & ~0xff) == 0)
+ return 1;
+ if((~v & ~0xff) == 0)
+ return 1;
+ v = (v<<2) | ((uint32)v>>30);
+ }
+ return 0;
+}
+
+int32
+exreg(Type *t)
+{
+ int32 o;
+
+ if(typechlp[t->etype]) {
+ if(exregoffset <= REGEXT-4)
+ return 0;
+ o = exregoffset;
+ exregoffset--;
+ return o;
+ }
+ if(typefd[t->etype]) {
+ if(exfregoffset <= NFREG-1)
+ return 0;
+ o = exfregoffset + NREG;
+ exfregoffset--;
+ return o;
+ }
+ return 0;
+}
+
+schar ewidth[NTYPE] =
+{
+ -1, /* [TXXX] */
+ SZ_CHAR, /* [TCHAR] */
+ SZ_CHAR, /* [TUCHAR] */
+ SZ_SHORT, /* [TSHORT] */
+ SZ_SHORT, /* [TUSHORT] */
+ SZ_INT, /* [TINT] */
+ SZ_INT, /* [TUINT] */
+ SZ_LONG, /* [TLONG] */
+ SZ_LONG, /* [TULONG] */
+ SZ_VLONG, /* [TVLONG] */
+ SZ_VLONG, /* [TUVLONG] */
+ SZ_FLOAT, /* [TFLOAT] */
+ SZ_DOUBLE, /* [TDOUBLE] */
+ SZ_IND, /* [TIND] */
+ 0, /* [TFUNC] */
+ -1, /* [TARRAY] */
+ 0, /* [TVOID] */
+ -1, /* [TSTRUCT] */
+ -1, /* [TUNION] */
+ SZ_INT, /* [TENUM] */
+};
+
+int32 ncast[NTYPE] =
+{
+ 0, /* [TXXX] */
+ BCHAR|BUCHAR, /* [TCHAR] */
+ BCHAR|BUCHAR, /* [TUCHAR] */
+ BSHORT|BUSHORT, /* [TSHORT] */
+ BSHORT|BUSHORT, /* [TUSHORT] */
+ BINT|BUINT|BLONG|BULONG|BIND, /* [TINT] */
+ BINT|BUINT|BLONG|BULONG|BIND, /* [TUINT] */
+ BINT|BUINT|BLONG|BULONG|BIND, /* [TLONG] */
+ BINT|BUINT|BLONG|BULONG|BIND, /* [TULONG] */
+ BVLONG|BUVLONG, /* [TVLONG] */
+ BVLONG|BUVLONG, /* [TUVLONG] */
+ BFLOAT, /* [TFLOAT] */
+ BDOUBLE, /* [TDOUBLE] */
+ BLONG|BULONG|BIND, /* [TIND] */
+ 0, /* [TFUNC] */
+ 0, /* [TARRAY] */
+ 0, /* [TVOID] */
+ BSTRUCT, /* [TSTRUCT] */
+ BUNION, /* [TUNION] */
+ 0, /* [TENUM] */
+};
generated by cgit v1.2.3 (git 2.39.1) at 2025-07-23 10:42:42 +0000