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68 lines
1.5 KiB
68 lines
1.5 KiB
3 years ago
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// Copyright 2020 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include "textflag.h"
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// func xorBytesARM64(dst, a, b *byte, n int)
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TEXT ·xorBytesARM64(SB), NOSPLIT|NOFRAME, $0
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MOVD dst+0(FP), R0
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MOVD a+8(FP), R1
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MOVD b+16(FP), R2
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MOVD n+24(FP), R3
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CMP $64, R3
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BLT tail
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loop_64:
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VLD1.P 64(R1), [V0.B16, V1.B16, V2.B16, V3.B16]
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VLD1.P 64(R2), [V4.B16, V5.B16, V6.B16, V7.B16]
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VEOR V0.B16, V4.B16, V4.B16
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VEOR V1.B16, V5.B16, V5.B16
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VEOR V2.B16, V6.B16, V6.B16
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VEOR V3.B16, V7.B16, V7.B16
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VST1.P [V4.B16, V5.B16, V6.B16, V7.B16], 64(R0)
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SUBS $64, R3
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CMP $64, R3
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BGE loop_64
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tail:
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// quick end
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CBZ R3, end
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TBZ $5, R3, less_than32
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VLD1.P 32(R1), [V0.B16, V1.B16]
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VLD1.P 32(R2), [V2.B16, V3.B16]
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VEOR V0.B16, V2.B16, V2.B16
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VEOR V1.B16, V3.B16, V3.B16
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VST1.P [V2.B16, V3.B16], 32(R0)
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less_than32:
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TBZ $4, R3, less_than16
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LDP.P 16(R1), (R11, R12)
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LDP.P 16(R2), (R13, R14)
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EOR R11, R13, R13
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EOR R12, R14, R14
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STP.P (R13, R14), 16(R0)
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less_than16:
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TBZ $3, R3, less_than8
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MOVD.P 8(R1), R11
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MOVD.P 8(R2), R12
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EOR R11, R12, R12
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MOVD.P R12, 8(R0)
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less_than8:
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TBZ $2, R3, less_than4
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MOVWU.P 4(R1), R13
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MOVWU.P 4(R2), R14
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EORW R13, R14, R14
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MOVWU.P R14, 4(R0)
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less_than4:
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TBZ $1, R3, less_than2
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MOVHU.P 2(R1), R15
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MOVHU.P 2(R2), R16
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EORW R15, R16, R16
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MOVHU.P R16, 2(R0)
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less_than2:
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TBZ $0, R3, end
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MOVBU (R1), R17
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MOVBU (R2), R19
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EORW R17, R19, R19
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MOVBU R19, (R0)
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end:
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RET
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