diff options
Diffstat (limited to 'src/lib/libast/features/align.c')
| -rw-r--r-- | src/lib/libast/features/align.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/src/lib/libast/features/align.c b/src/lib/libast/features/align.c new file mode 100644 index 0000000..e2c97c8 --- /dev/null +++ b/src/lib/libast/features/align.c @@ -0,0 +1,188 @@ +/*********************************************************************** +* * +* This software is part of the ast package * +* Copyright (c) 1985-2011 AT&T Intellectual Property * +* and is licensed under the * +* Eclipse Public License, Version 1.0 * +* by AT&T Intellectual Property * +* * +* A copy of the License is available at * +* http://www.eclipse.org/org/documents/epl-v10.html * +* (with md5 checksum b35adb5213ca9657e911e9befb180842) * +* * +* Information and Software Systems Research * +* AT&T Research * +* Florham Park NJ * +* * +* Glenn Fowler <gsf@research.att.com> * +* David Korn <dgk@research.att.com> * +* Phong Vo <kpv@research.att.com> * +* * +***********************************************************************/ +#pragma prototyped +/* + * Glenn Fowler + * AT&T Bell Laboratories + * + * generate align features + * + * NOTE: two's complement binary integral representation assumed + */ + +#include "FEATURE/common" + +#include <setjmp.h> + +union _u_ +{ + long u1; + char* u2; + double u3; + char u4[1024]; + intmax_t u5; + uintmax_t u6; + _ast_fltmax_t u7; + void* u8; + char* (*u9)(); + jmp_buf u10; +}; + +struct _s_ +{ + char s1; + union _u_ s2; +}; + +#define roundof(x,y) (((x)+((y)-1))&~((y)-1)) + +static union _u_ u; +static union _u_ v; + +int +main() +{ + register int i; + register int j; + register int k; + + int align0; + int align1; + int align2; + unsigned long bit1; + unsigned long bit2; + unsigned long bits0; + unsigned long bits1; + unsigned long bits2; + + u.u2 = u.u4; + v.u2 = u.u2 + 1; + bit1 = u.u1 ^ v.u1; + v.u2 = u.u2 + 2; + bit2 = u.u1 ^ v.u1; + align0 = sizeof(struct _s_) - sizeof(union _u_); + bits0 = 0; + k = 0; + for (j = 0; j < align0; j++) + { + u.u2 = u.u4 + j; + bits1 = 0; + for (i = 0; i < align0; i++) + { + v.u2 = u.u2 + i; + bits1 |= u.u1 ^ v.u1; + } + if (!bits0 || bits1 < bits0) + { + bits0 = bits1; + k = j; + } + } + align1 = roundof(align0, 2); + u.u2 = u.u4 + k; + for (bits1 = bits0; i < align1; i++) + { + v.u2 = u.u2 + i; + bits1 |= u.u1 ^ v.u1; + } + align2 = roundof(align0, 4); + for (bits2 = bits1; i < align2; i++) + { + v.u2 = u.u2 + i; + bits2 |= u.u1 ^ v.u1; + } + printf("\n"); + printf("#define ALIGN_CHUNK %d\n", sizeof(char*) >= 4 ? 8192 : 1024); + printf("#define ALIGN_INTEGRAL uintptr_t\n"); + printf("#define ALIGN_INTEGER(x) ((char*)(x)-(char*)0)\n"); + printf("#define ALIGN_POINTER(x) ((char*)(x))\n"); + if (bits2 == (align2 - 1)) + printf("#define ALIGN_ROUND(x,y) ALIGN_POINTER(ALIGN_INTEGER((x)+(y)-1)&~((y)-1))\n"); + else + printf("#define ALIGN_ROUND(x,y) ALIGN_POINTER(ALIGN_INTEGER(ALIGN_ALIGN(x)+(((y)+%d)/%d)-1)&~((((y)+%d)/%d)-1))\n", align0, align0, align0, align0); + printf("\n"); + if (align0 == align2) + { + printf("#define ALIGN_BOUND ALIGN_BOUND2\n"); + printf("#define ALIGN_ALIGN(x) ALIGN_ALIGN2(x)\n"); + printf("#define ALIGN_TRUNC(x) ALIGN_TRUNC2(x)\n"); + } + else if (align0 == align1) + { + printf("#define ALIGN_BOUND ALIGN_BOUND1\n"); + printf("#define ALIGN_ALIGN(x) ALIGN_ALIGN1(x)\n"); + printf("#define ALIGN_TRUNC(x) ALIGN_TRUNC1(x)\n"); + } + else + { + printf("#define ALIGN_BOUND 1\n"); + printf("#define ALIGN_ALIGN(x) ALIGN_POINTER(x)\n"); + printf("#define ALIGN_TRUNC(x) ALIGN_POINTER(x)\n"); + } + printf("\n"); + printf("#define ALIGN_BIT1 0x%lx\n", bit1); + if (align1 == align2) + { + printf("#define ALIGN_BOUND1 ALIGN_BOUND2\n"); + printf("#define ALIGN_ALIGN1(x) ALIGN_ALIGN2(x)\n"); + printf("#define ALIGN_TRUNC1(x) ALIGN_TRUNC2(x)\n"); + } + else + { + printf("#define ALIGN_BOUND1 %d\n", align1); + printf("#define ALIGN_ALIGN1(x) ALIGN_TRUNC1((x)+%d)\n", align1 - 1); + printf("#define ALIGN_TRUNC1(x) ALIGN_POINTER(ALIGN_INTEGER((x)+%d)&0x%lx)\n", align1 - 1, ~(bits0|bits1)); + } +#if _X86_ || _X64_ + printf("#if _X64_\n"); + printf("#define ALIGN_CLRBIT1(x) ALIGN_POINTER(ALIGN_INTEGER(x)&0xfffffffffffffffeULL)\n"); + printf("#else\n"); + printf("#define ALIGN_CLRBIT1(x) ALIGN_POINTER(ALIGN_INTEGER(x)&0xfffffffe)\n"); + printf("#endif\n"); +#else + printf("#define ALIGN_CLRBIT1(x) ALIGN_POINTER(ALIGN_INTEGER(x)&0x%lx)\n", ~bit1); +#endif + printf("#define ALIGN_SETBIT1(x) ALIGN_POINTER(ALIGN_INTEGER(x)|0x%lx)\n", bit1); + printf("#define ALIGN_TSTBIT1(x) ALIGN_POINTER(ALIGN_INTEGER(x)&0x%lx)\n", bit1); + printf("\n"); + printf("#define ALIGN_BIT2 0x%lx\n", bit2); +#if _X86_ || _X64_ + printf("#if _X64_\n"); + printf("#define ALIGN_BOUND2 16\n"); + printf("#define ALIGN_ALIGN2(x) ALIGN_TRUNC2((x)+15)\n"); + printf("#define ALIGN_TRUNC2(x) ALIGN_POINTER(ALIGN_INTEGER(x)&0xfffffffffffffffeULL)\n"); + printf("#else\n"); + printf("#define ALIGN_BOUND2 8\n"); + printf("#define ALIGN_ALIGN2(x) ALIGN_TRUNC2((x)+7)\n"); + printf("#define ALIGN_TRUNC2(x) ALIGN_POINTER(ALIGN_INTEGER(x)&0xfffffff8)\n"); + printf("#endif\n"); +#else + printf("#define ALIGN_BOUND2 %d\n", align2); + printf("#define ALIGN_ALIGN2(x) ALIGN_TRUNC2((x)+%d)\n", align2 - 1); + printf("#define ALIGN_TRUNC2(x) ALIGN_POINTER(ALIGN_INTEGER(x)&0x%lx)\n", ~(bits0|bits1|bits2)); +#endif + printf("#define ALIGN_CLRBIT2(x) ALIGN_POINTER(ALIGN_INTEGER(x)&0x%lx)\n", ~bit2); + printf("#define ALIGN_SETBIT2(x) ALIGN_POINTER(ALIGN_INTEGER(x)|0x%lx)\n", bit2); + printf("#define ALIGN_TSTBIT2(x) ALIGN_POINTER(ALIGN_INTEGER(x)&0x%lx)\n", bit2); + printf("\n"); + return 0; +} |