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internal/subtle: s390x rollback first

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Sun Yimin 2024-08-28 09:59:52 +08:00 committed by GitHub
parent d3727e7130
commit e3fba2448c
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1 changed files with 3 additions and 26 deletions
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29
internal/subtle/xor_s390x.s
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@ -13,39 +13,16 @@ TEXT ·xorBytes(SB),NOSPLIT,$0-32
MOVD n+24(FP), R4 MOVD n+24(FP), R4
MOVD $0, R5 MOVD $0, R5
CMPBLT R4, $64, less_than64
loop64b:
VLM 0(R2)(R5*1), V0, V3
VLM 0(R3)(R5*1), V4, V7
VX V0, V4, V4
VX V1, V5, V5
VX V2, V6, V6
VX V3, V7, V7
VSTM V4, V7, 0(R1)(R5*1)
LAY 64(R5), R5
SUB $64, R4
CMPBGE R4, $64, loop64b
less_than64:
CMPBEQ R4, $0, done // quick end
CMPBLT R4, $32, less_than32
VLM 0(R2)(R5*1), V0, V1
VLM 0(R3)(R5*1), V2, V3
VX V0, V2, V2
VX V1, V3, V3
VSTM V2, V3, 0(R1)(R5*1)
LAY 32(R5), R5
SUB $32, R4
less_than32:
CMPBLT R4, $16, less_than16 CMPBLT R4, $16, less_than16
loop16b:
VL 0(R2)(R5*1), V0 VL 0(R2)(R5*1), V0
VL 0(R3)(R5*1), V1 VL 0(R3)(R5*1), V1
VX V0, V1, V2 VX V0, V1, V2
VST V2, 0(R1)(R5*1) VST V2, 0(R1)(R5*1)
LAY 16(R5), R5 LAY 16(R5), R5
SUB $16, R4 SUB $16, R4
CMPBGE R4, $16, loop16b
less_than16: less_than16:
CMPBLT R4, $8, tail CMPBLT R4, $8, tail