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runtime: use SETEQ instead of JZ for cas

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Change-Id: Ibabbca3988d39bdce584924173a912d45f50f0dd
Reviewed-on: https://go-review.googlesource.com/2243
Reviewed-by: Dave Cheney <dave@cheney.net>
Reviewed-by: Minux Ma <minux@golang.org>
This commit is contained in:
Josh Bleecher Snyder 2014-12-31 17:31:32 -08:00
parent 8bbd80063b
commit 17577e48c9
3 changed files with 9 additions and 57 deletions
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22
src/runtime/asm_386.s
View File

@ -439,12 +439,7 @@ TEXT runtime·cas(SB), NOSPLIT, $0-13
MOVL new+8(FP), CX
LOCK
CMPXCHGL CX, 0(BX)
JZ 4(PC)
MOVL $0, AX
MOVB AX, ret+12(FP)
RET
MOVL $1, AX
MOVB AX, ret+12(FP)
SETEQ , ret+12(FP)
RET
TEXT runtime·casuintptr(SB), NOSPLIT, $0-13
@ -475,13 +470,7 @@ TEXT runtime·cas64(SB), NOSPLIT, $0-21
MOVL new_hi+16(FP), CX
LOCK
CMPXCHG8B 0(BP)
JNZ fail
MOVL $1, AX
MOVB AX, ret+20(FP)
RET
fail:
MOVL $0, AX
MOVB AX, ret+20(FP)
SETEQ , ret+20(FP)
RET
// bool casp(void **p, void *old, void *new)
@ -497,12 +486,7 @@ TEXT runtime·casp1(SB), NOSPLIT, $0-13
MOVL new+8(FP), CX
LOCK
CMPXCHGL CX, 0(BX)
JZ 4(PC)
MOVL $0, AX
MOVB AX, ret+12(FP)
RET
MOVL $1, AX
MOVB AX, ret+12(FP)
SETEQ , ret+12(FP)
RET
// uint32 xadd(uint32 volatile *val, int32 delta)

22
src/runtime/asm_amd64.s
View File

@ -427,12 +427,7 @@ TEXT runtime·cas(SB), NOSPLIT, $0-17
MOVL new+12(FP), CX
LOCK
CMPXCHGL CX, 0(BX)
JZ 4(PC)
MOVL $0, AX
MOVB AX, ret+16(FP)
RET
MOVL $1, AX
MOVB AX, ret+16(FP)
SETEQ , ret+16(FP)
RET
// bool runtime·cas64(uint64 *val, uint64 old, uint64 new)
@ -449,13 +444,7 @@ TEXT runtime·cas64(SB), NOSPLIT, $0-25
MOVQ new+16(FP), CX
LOCK
CMPXCHGQ CX, 0(BX)
JNZ fail
MOVL $1, AX
MOVB AX, ret+24(FP)
RET
fail:
MOVL $0, AX
MOVB AX, ret+24(FP)
SETEQ , ret+24(FP)
RET
TEXT runtime·casuintptr(SB), NOSPLIT, $0-25
@ -483,12 +472,7 @@ TEXT runtime·casp1(SB), NOSPLIT, $0-25
MOVQ new+16(FP), CX
LOCK
CMPXCHGQ CX, 0(BX)
JZ 4(PC)
MOVL $0, AX
MOVB AX, ret+24(FP)
RET
MOVL $1, AX
MOVB AX, ret+24(FP)
SETEQ , ret+24(FP)
RET
// uint32 xadd(uint32 volatile *val, int32 delta)

22
src/runtime/asm_amd64p32.s
View File

@ -400,12 +400,7 @@ TEXT runtime·cas(SB), NOSPLIT, $0-17
MOVL new+8(FP), CX
LOCK
CMPXCHGL CX, 0(BX)
JZ 4(PC)
MOVL $0, AX
MOVB AX, ret+16(FP)
RET
MOVL $1, AX
MOVB AX, ret+16(FP)
SETEQ , ret+16(FP)
RET
TEXT runtime·casuintptr(SB), NOSPLIT, $0-17
@ -434,13 +429,7 @@ TEXT runtime·cas64(SB), NOSPLIT, $0-25
MOVQ new+16(FP), CX
LOCK
CMPXCHGQ CX, 0(BX)
JNZ fail
MOVL $1, AX
MOVB AX, ret+24(FP)
RET
fail:
MOVL $0, AX
MOVB AX, ret+24(FP)
SETEQ , ret+24(FP)
RET
// bool casp(void **val, void *old, void *new)
@ -456,12 +445,7 @@ TEXT runtime·casp1(SB), NOSPLIT, $0-17
MOVL new+8(FP), CX
LOCK
CMPXCHGL CX, 0(BX)
JZ 4(PC)
MOVL $0, AX
MOVB AX, ret+16(FP)
RET
MOVL $1, AX
MOVB AX, ret+16(FP)
SETEQ , ret+16(FP)
RET
// uint32 xadd(uint32 volatile *val, int32 delta)