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71 lines
1.2 KiB
ArmAsm
71 lines
1.2 KiB
ArmAsm
// The original code (non-vector) is ported from Golang
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// https://github.com/golang/go/blob/master/src/crypto/aes/ctr_s390x.go
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//go:build !purego
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#include "textflag.h"
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// func xorBytes(dst, a, b *byte, n int)
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TEXT ·xorBytes(SB),NOSPLIT,$0-32
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MOVD dst+0(FP), R1
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MOVD a+8(FP), R2
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MOVD b+16(FP), R3
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MOVD n+24(FP), R4
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MOVD $0, R5
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CMPBLT R4, $64, less_than64
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loop64b:
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VLM 0(R2)(R5*1), V0, V3
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VLM 0(R3)(R5*1), V4, V7
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VX V0, V4, V4
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VX V1, V5, V5
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VX V2, V6, V6
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VX V3, V7, V7
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VSTM V4, V7, 0(R1)(R5*1)
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LAY 64(R5), R5
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SUB $64, R4
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CMPBGE R4, $64, loop64b
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less_than64:
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CMPBEQ R4, $0, done // quick end
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CMPBLT R4, $32, less_than32
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VLM 0(R2)(R5*1), V0, V1
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VLM 0(R3)(R5*1), V2, V3
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VX V0, V2, V2
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VX V1, V3, V3
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VSTM V2, V3, 0(R1)(R5*1)
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LAY 32(R5), R5
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SUB $32, R4
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less_than32:
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CMPBLT R4, $16, less_than16
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VL 0(R2)(R5*1), V0
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VL 0(R3)(R5*1), V1
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VX V0, V1, V2
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VST V2, 0(R1)(R5*1)
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LAY 16(R5), R5
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SUB $16, R4
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less_than16:
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CMPBLT R4, $8, tail
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MOVD 0(R2)(R5*1), R7
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MOVD 0(R3)(R5*1), R8
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XOR R7, R8
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MOVD R8, 0(R1)(R5*1)
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LAY 8(R5), R5
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SUB $8, R4
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tail:
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CMPBEQ R4, $0, done
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MOVB 0(R2)(R5*1), R7
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MOVB 0(R3)(R5*1), R8
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XOR R7, R8
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MOVB R8, 0(R1)(R5*1)
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LAY 1(R5), R5
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SUB $1, R4
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BR tail
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done:
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RET
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