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syscall: avoid zeroing unused syscall arguments

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Zeroing unused registers is not required. Removing it makes the code
very slightly smaller and very slightly faster.

Change-Id: I1ec17b497db971ca8a3641e3e94c063571419f27
GitHub-Last-Rev: f721bb2636
GitHub-Pull-Request: golang/go#31596
Reviewed-on: https://go-review.googlesource.com/c/go/+/173160
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Maya Rashish 2019-04-21 14:48:28 +00:00 committed by Ian Lance Taylor
parent 782228a73f
commit 531f1d50cc
3 changed files with 0 additions and 21 deletions
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6
src/syscall/asm_darwin_amd64.s
View File

@ -17,9 +17,6 @@ TEXT ·Syscall(SB),NOSPLIT,$0-56
MOVQ a1+8(FP), DI MOVQ a1+8(FP), DI
MOVQ a2+16(FP), SI MOVQ a2+16(FP), SI
MOVQ a3+24(FP), DX MOVQ a3+24(FP), DX
MOVQ $0, R10
MOVQ $0, R8
MOVQ $0, R9
MOVQ trap+0(FP), AX // syscall entry MOVQ trap+0(FP), AX // syscall entry
ADDQ $0x2000000, AX ADDQ $0x2000000, AX
SYSCALL SYSCALL
@ -100,9 +97,6 @@ TEXT ·RawSyscall(SB),NOSPLIT,$0-56
MOVQ a1+8(FP), DI MOVQ a1+8(FP), DI
MOVQ a2+16(FP), SI MOVQ a2+16(FP), SI
MOVQ a3+24(FP), DX MOVQ a3+24(FP), DX
MOVQ $0, R10
MOVQ $0, R8
MOVQ $0, R9
MOVQ trap+0(FP), AX // syscall entry MOVQ trap+0(FP), AX // syscall entry
ADDQ $0x2000000, AX ADDQ $0x2000000, AX
SYSCALL SYSCALL

9
src/syscall/asm_linux_amd64.s
View File

@ -19,9 +19,6 @@ TEXT ·Syscall(SB),NOSPLIT,$0-56
MOVQ a1+8(FP), DI MOVQ a1+8(FP), DI
MOVQ a2+16(FP), SI MOVQ a2+16(FP), SI
MOVQ a3+24(FP), DX MOVQ a3+24(FP), DX
MOVQ $0, R10
MOVQ $0, R8
MOVQ $0, R9
MOVQ trap+0(FP), AX // syscall entry MOVQ trap+0(FP), AX // syscall entry
SYSCALL SYSCALL
CMPQ AX, $0xfffffffffffff001 CMPQ AX, $0xfffffffffffff001
@ -70,9 +67,6 @@ TEXT ·RawSyscall(SB),NOSPLIT,$0-56
MOVQ a1+8(FP), DI MOVQ a1+8(FP), DI
MOVQ a2+16(FP), SI MOVQ a2+16(FP), SI
MOVQ a3+24(FP), DX MOVQ a3+24(FP), DX
MOVQ $0, R10
MOVQ $0, R8
MOVQ $0, R9
MOVQ trap+0(FP), AX // syscall entry MOVQ trap+0(FP), AX // syscall entry
SYSCALL SYSCALL
CMPQ AX, $0xfffffffffffff001 CMPQ AX, $0xfffffffffffff001
@ -139,9 +133,6 @@ TEXT ·rawSyscallNoError(SB),NOSPLIT,$0-48
MOVQ a1+8(FP), DI MOVQ a1+8(FP), DI
MOVQ a2+16(FP), SI MOVQ a2+16(FP), SI
MOVQ a3+24(FP), DX MOVQ a3+24(FP), DX
MOVQ $0, R10
MOVQ $0, R8
MOVQ $0, R9
MOVQ trap+0(FP), AX // syscall entry MOVQ trap+0(FP), AX // syscall entry
SYSCALL SYSCALL
MOVQ AX, r1+32(FP) MOVQ AX, r1+32(FP)

6
src/syscall/asm_unix_amd64.s
View File

@ -21,9 +21,6 @@ TEXT ·Syscall(SB),NOSPLIT,$0-56
MOVQ a1+8(FP), DI MOVQ a1+8(FP), DI
MOVQ a2+16(FP), SI MOVQ a2+16(FP), SI
MOVQ a3+24(FP), DX MOVQ a3+24(FP), DX
MOVQ $0, R10
MOVQ $0, R8
MOVQ $0, R9
SYSCALL SYSCALL
JCC ok JCC ok
MOVQ $-1, r1+32(FP) // r1 MOVQ $-1, r1+32(FP) // r1
@ -65,9 +62,6 @@ TEXT ·RawSyscall(SB),NOSPLIT,$0-56
MOVQ a1+8(FP), DI MOVQ a1+8(FP), DI
MOVQ a2+16(FP), SI MOVQ a2+16(FP), SI
MOVQ a3+24(FP), DX MOVQ a3+24(FP), DX
MOVQ $0, R10
MOVQ $0, R8
MOVQ $0, R9
MOVQ trap+0(FP), AX // syscall entry MOVQ trap+0(FP), AX // syscall entry
SYSCALL SYSCALL
JCC ok1 JCC ok1