mirror of
https://github.com/golang/go
synced 2024-11-19 16:14:49 -07:00
7c04633e0c
Fixes #16911. Fix obsolete inferno-os links, since code.google.com shutdown. This CL points to the right files by replacing http://code.google.com/p/inferno-os/source/browse with https://bitbucket.org/inferno-os/inferno-os/src/default To implement the change I wrote and ran this script in the root: $ grep -Rn 'http://code.google.com/p/inferno-os/source/browse' * \ | cut -d":" -f1 | while read F;do perl -pi -e \ 's/http:\/\/code.google.com\/p\/inferno-os\/source\/browse/https:\/\/bitbucket.org\/inferno-os\/inferno-os\/src\/default/g' $F;done I excluded any cmd/vendor changes from the commit. Change-Id: Iaaf828ac8f6fc949019fd01832989d00b29b6749 Reviewed-on: https://go-review.googlesource.com/27994 Reviewed-by: Ian Lance Taylor <iant@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
134 lines
3.0 KiB
ArmAsm
134 lines
3.0 KiB
ArmAsm
// Derived from Inferno's libkern/memmove-386.s (adapted for amd64)
|
|
// https://bitbucket.org/inferno-os/inferno-os/src/default/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 "textflag.h"
|
|
|
|
// void runtime·memmove(void*, void*, uintptr)
|
|
TEXT runtime·memmove(SB), NOSPLIT, $0-24
|
|
|
|
MOVQ to+0(FP), DI
|
|
MOVQ from+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
|
|
JB move_5through7
|
|
JE move_8
|
|
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)
|
|
RET
|
|
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_5through7:
|
|
MOVL (SI), AX
|
|
MOVL -4(SI)(BX*1), CX
|
|
MOVL AX, (DI)
|
|
MOVL CX, -4(DI)(BX*1)
|
|
RET
|
|
move_8:
|
|
// We need a separate case for 8 to make sure we write pointers atomically.
|
|
MOVQ (SI), AX
|
|
MOVQ AX, (DI)
|
|
RET
|
|
move_9through16:
|
|
MOVQ (SI), AX
|
|
MOVQ -8(SI)(BX*1), CX
|
|
MOVQ AX, (DI)
|
|
MOVQ CX, -8(DI)(BX*1)
|
|
RET
|