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Diffstat (limited to 'src/crypto/subtle/xor_arm64.s')
| -rw-r--r-- | src/crypto/subtle/xor_arm64.s | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/src/crypto/subtle/xor_arm64.s b/src/crypto/subtle/xor_arm64.s new file mode 100644 index 0000000..7632164 --- /dev/null +++ b/src/crypto/subtle/xor_arm64.s @@ -0,0 +1,69 @@ +// Copyright 2020 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +//go:build !purego + +#include "textflag.h" + +// func xorBytes(dst, a, b *byte, n int) +TEXT ·xorBytes(SB), NOSPLIT|NOFRAME, $0 + MOVD dst+0(FP), R0 + MOVD a+8(FP), R1 + MOVD b+16(FP), R2 + MOVD n+24(FP), R3 + CMP $64, R3 + BLT tail +loop_64: + VLD1.P 64(R1), [V0.B16, V1.B16, V2.B16, V3.B16] + VLD1.P 64(R2), [V4.B16, V5.B16, V6.B16, V7.B16] + VEOR V0.B16, V4.B16, V4.B16 + VEOR V1.B16, V5.B16, V5.B16 + VEOR V2.B16, V6.B16, V6.B16 + VEOR V3.B16, V7.B16, V7.B16 + VST1.P [V4.B16, V5.B16, V6.B16, V7.B16], 64(R0) + SUBS $64, R3 + CMP $64, R3 + BGE loop_64 +tail: + // quick end + CBZ R3, end + TBZ $5, R3, less_than32 + VLD1.P 32(R1), [V0.B16, V1.B16] + VLD1.P 32(R2), [V2.B16, V3.B16] + VEOR V0.B16, V2.B16, V2.B16 + VEOR V1.B16, V3.B16, V3.B16 + VST1.P [V2.B16, V3.B16], 32(R0) +less_than32: + TBZ $4, R3, less_than16 + LDP.P 16(R1), (R11, R12) + LDP.P 16(R2), (R13, R14) + EOR R11, R13, R13 + EOR R12, R14, R14 + STP.P (R13, R14), 16(R0) +less_than16: + TBZ $3, R3, less_than8 + MOVD.P 8(R1), R11 + MOVD.P 8(R2), R12 + EOR R11, R12, R12 + MOVD.P R12, 8(R0) +less_than8: + TBZ $2, R3, less_than4 + MOVWU.P 4(R1), R13 + MOVWU.P 4(R2), R14 + EORW R13, R14, R14 + MOVWU.P R14, 4(R0) +less_than4: + TBZ $1, R3, less_than2 + MOVHU.P 2(R1), R15 + MOVHU.P 2(R2), R16 + EORW R15, R16, R16 + MOVHU.P R16, 2(R0) +less_than2: + TBZ $0, R3, end + MOVBU (R1), R17 + MOVBU (R2), R19 + EORW R17, R19, R19 + MOVBU R19, (R0) +end: + RET |