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runtime: fix 386 build after cas64 change

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Missed this in CL 10909045.

TBR=golang-dev
CC=golang-dev
https://golang.org/cl/10803045
This commit is contained in:
Russ Cox 2013-07-12 00:42:46 -04:00
parent d754647963
commit f70a19f085
2 changed files with 6 additions and 10 deletions
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14
src/pkg/runtime/asm_386.s
View File

@ -319,30 +319,26 @@ TEXT runtime·cas(SB), 7, $0
MOVL $1, AX
RET
// bool runtime·cas64(uint64 *val, uint64 *old, uint64 new)
// bool runtime·cas64(uint64 *val, uint64 old, uint64 new)
// Atomically:
// if(*val == *old){
// *val = new;
// return 1;
// } else {
// *old = *val
// return 0;
// }
TEXT runtime·cas64(SB), 7, $0
MOVL 4(SP), BP
MOVL 8(SP), SI
MOVL 0(SI), AX
MOVL 4(SI), DX
MOVL 12(SP), BX
MOVL 16(SP), CX
MOVL 8(SP), AX
MOVL 12(SP), DX
MOVL 16(SP), BX
MOVL 20(SP), CX
LOCK
CMPXCHG8B 0(BP)
JNZ cas64_fail
MOVL $1, AX
RET
cas64_fail:
MOVL AX, 0(SI)
MOVL DX, 4(SI)
MOVL $0, AX
RET

2
src/pkg/runtime/atomic_386.c
View File

@ -38,7 +38,7 @@ runtime·xchg64(uint64 volatile* addr, uint64 v)
uint64 old;
do
old = addr;
old = *addr;
while(!runtime·cas64(addr, old, v));
return old;