diff options
Diffstat (limited to 'src/pkg/runtime/memmove_plan9_amd64.s')
| -rw-r--r-- | src/pkg/runtime/memmove_plan9_amd64.s | 126 |
1 files changed, 0 insertions, 126 deletions
diff --git a/src/pkg/runtime/memmove_plan9_amd64.s b/src/pkg/runtime/memmove_plan9_amd64.s deleted file mode 100644 index 60108273c..000000000 --- a/src/pkg/runtime/memmove_plan9_amd64.s +++ /dev/null @@ -1,126 +0,0 @@ -// Derived from Inferno's libkern/memmove-386.s (adapted for amd64) -// http://code.google.com/p/inferno-os/source/browse/libkern/memmove-386.s -// -// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved. -// Revisions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com). All rights reserved. -// 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 "../../cmd/ld/textflag.h" - -// void runtime·memmove(void*, void*, uintptr) -TEXT runtime·memmove(SB), NOSPLIT, $0-24 - - MOVQ to+0(FP), DI - MOVQ fr+8(FP), SI - MOVQ n+16(FP), BX - - // REP instructions have a high startup cost, so we handle small sizes - // with some straightline code. The REP MOVSQ instruction is really fast - // for large sizes. The cutover is approximately 1K. -tail: - TESTQ BX, BX - JEQ move_0 - CMPQ BX, $2 - JBE move_1or2 - CMPQ BX, $4 - JBE move_3or4 - CMPQ BX, $8 - JBE move_5through8 - CMPQ BX, $16 - JBE move_9through16 - -/* - * check and set for backwards - */ - CMPQ SI, DI - JLS back - -/* - * forward copy loop - */ -forward: - MOVQ BX, CX - SHRQ $3, CX - ANDQ $7, BX - - REP; MOVSQ - JMP tail - -back: -/* - * check overlap - */ - MOVQ SI, CX - ADDQ BX, CX - CMPQ CX, DI - JLS forward - -/* - * whole thing backwards has - * adjusted addresses - */ - ADDQ BX, DI - ADDQ BX, SI - STD - -/* - * copy - */ - MOVQ BX, CX - SHRQ $3, CX - ANDQ $7, BX - - SUBQ $8, DI - SUBQ $8, SI - REP; MOVSQ - - CLD - ADDQ $8, DI - ADDQ $8, SI - SUBQ BX, DI - SUBQ BX, SI - JMP tail - -move_1or2: - MOVB (SI), AX - MOVB -1(SI)(BX*1), CX - MOVB AX, (DI) - MOVB CX, -1(DI)(BX*1) -move_0: - RET -move_3or4: - MOVW (SI), AX - MOVW -2(SI)(BX*1), CX - MOVW AX, (DI) - MOVW CX, -2(DI)(BX*1) - RET -move_5through8: - MOVL (SI), AX - MOVL -4(SI)(BX*1), CX - MOVL AX, (DI) - MOVL CX, -4(DI)(BX*1) - RET -move_9through16: - MOVQ (SI), AX - MOVQ -8(SI)(BX*1), CX - MOVQ AX, (DI) - MOVQ CX, -8(DI)(BX*1) - RET |