2024-09-02 13:13:16 +08:00
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// Copyright 2024 Sun Yimin. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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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|NOFRAME, $0
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MOV dst+0(FP), X5
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MOV a+8(FP), X6
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MOV b+16(FP), X7
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MOV n+24(FP), X8
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MOV $8, X9
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BLTU X8, X9, tail
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loop:
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MOV (X6), X10
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MOV (X7), X11
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XOR X10, X11, X10
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MOV X10, (X5)
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ADD $8, X5
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ADD $8, X6
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ADD $8, X7
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SUB $8, X8
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BGEU X8, X9, loop
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tail:
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BEQZ X8, done
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MOV $4, X9
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BLTU X8, X9, less_than4
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MOVWU (X6), X10
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MOVWU (X7), X11
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XOR X10, X11, X10
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MOVW X10, (X5)
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ADD $4, X5
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ADD $4, X6
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ADD $4, X7
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SUB $4, X8
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less_than4:
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MOV $2, X9
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BLTU X8, X9, less_than2
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MOVHU (X6), X10
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MOVHU (X7), X11
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XOR X10, X11, X10
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2024-09-02 13:18:08 +08:00
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MOVH X10, (X5)
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2024-09-02 13:13:16 +08:00
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ADD $2, X5
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ADD $2, X6
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ADD $2, X7
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SUB $2, X8
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less_than2:
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BEQZ X8, done
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MOVBU (X6), X10
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MOVBU (X7), X11
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XOR X10, X11, X10
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2024-09-02 13:18:08 +08:00
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MOVB X10, (X5)
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2024-09-02 13:13:16 +08:00
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done:
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RET
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