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internal/subtle: s390x, handle tail

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Sun Yimin 2024-08-28 10:13:59 +08:00 committed by GitHub
parent e3fba2448c
commit eb36af59e5
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1 changed files with 22 additions and 7 deletions
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29
internal/subtle/xor_s390x.s
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@ -13,7 +13,7 @@ TEXT ·xorBytes(SB),NOSPLIT,$0-32
MOVD n+24(FP), R4
MOVD $0, R5
CMPBLT R4, $16, less_than16
CMPBLT R4, $16, tail
loop16b:
VL 0(R2)(R5*1), V0
@ -24,8 +24,8 @@ loop16b:
SUB $16, R4
CMPBGE R4, $16, loop16b
less_than16:
CMPBLT R4, $8, tail
tail:
CMPBLT R4, $8, less_than8
MOVD 0(R2)(R5*1), R7
MOVD 0(R3)(R5*1), R8
XOR R7, R8
@ -33,15 +33,30 @@ less_than16:
LAY 8(R5), R5
SUB $8, R4
tail:
less_than8:
CMPBLT R4, $4, less_than4
MOVWZ 0(R2)(R5*1), R7
MOVWZ 0(R3)(R5*1), R8
XOR R7, R8
MOVW R8, 0(R1)(R5*1)
LAY 4(R5), R5
SUB $4, R4
less_than4:
CMPBLT R4, $2, less_than2
MOVHZ 0(R2)(R5*1), R7
MOVHZ 0(R3)(R5*1), R8
XOR R7, R8
MOVH R8, 0(R1)(R5*1)
LAY 2(R5), R5
SUB $2, R4
less_than2:
CMPBEQ R4, $0, done
MOVB 0(R2)(R5*1), R7
MOVB 0(R3)(R5*1), R8
XOR R7, R8
MOVB R8, 0(R1)(R5*1)
LAY 1(R5), R5
SUB $1, R4
BR tail
done:
RET