mirror of
https://github.com/emmansun/gmsm.git
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170 lines
2.7 KiB
ArmAsm
170 lines
2.7 KiB
ArmAsm
// 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), X10
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MOV a+8(FP), X11
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MOV b+16(FP), X12
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MOV n+24(FP), X13
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MOV $32, X15
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BLT X13, X15, loop4_check
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// Check alignment - if alignment differs we have to do one byte at a time.
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AND $7, X10, X5
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AND $7, X11, X6
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AND $7, X12, X7
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BNE X5, X6, loop4_check
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BNE X5, X7, loop4_check
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BEQZ X5, loop64_check
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// Check one byte at a time until we reach 8 byte alignment.
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MOV $8, X8
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SUB X5, X8
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SUB X8, X13
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align:
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MOVBU 0(X11), X16
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MOVBU 0(X12), X17
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XOR X16, X17
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MOVB X17, 0(X10)
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ADD $1, X10
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ADD $1, X11
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ADD $1, X12
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SUB $1, X8
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BNEZ X8, align
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loop64_check:
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MOV $64, X15
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BLT X13, X15, tail32_check
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PCALIGN $16
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loop64:
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MOV 0(X11), X16
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MOV 0(X12), X17
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MOV 8(X11), X18
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MOV 8(X12), X19
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XOR X16, X17
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XOR X18, X19
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MOV X17, 0(X10)
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MOV X19, 8(X10)
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MOV 16(X11), X20
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MOV 16(X12), X21
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MOV 24(X11), X22
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MOV 24(X12), X23
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XOR X20, X21
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XOR X22, X23
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MOV X21, 16(X10)
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MOV X23, 24(X10)
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MOV 32(X11), X16
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MOV 32(X12), X17
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MOV 40(X11), X18
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MOV 40(X12), X19
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XOR X16, X17
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XOR X18, X19
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MOV X17, 32(X10)
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MOV X19, 40(X10)
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MOV 48(X11), X20
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MOV 48(X12), X21
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MOV 56(X11), X22
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MOV 56(X12), X23
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XOR X20, X21
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XOR X22, X23
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MOV X21, 48(X10)
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MOV X23, 56(X10)
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ADD $64, X10
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ADD $64, X11
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ADD $64, X12
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SUB $64, X13
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BGE X13, X15, loop64
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BEQZ X13, done
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tail32_check:
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MOV $32, X15
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BLT X13, X15, tail16_check
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MOV 0(X11), X16
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MOV 0(X12), X17
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MOV 8(X11), X18
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MOV 8(X12), X19
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XOR X16, X17
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XOR X18, X19
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MOV X17, 0(X10)
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MOV X19, 8(X10)
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MOV 16(X11), X20
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MOV 16(X12), X21
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MOV 24(X11), X22
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MOV 24(X12), X23
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XOR X20, X21
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XOR X22, X23
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MOV X21, 16(X10)
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MOV X23, 24(X10)
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ADD $32, X10
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ADD $32, X11
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ADD $32, X12
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SUB $32, X13
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BEQZ X13, done
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tail16_check:
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MOV $16, X15
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BLT X13, X15, loop4_check
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MOV 0(X11), X16
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MOV 0(X12), X17
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MOV 8(X11), X18
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MOV 8(X12), X19
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XOR X16, X17
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XOR X18, X19
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MOV X17, 0(X10)
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MOV X19, 8(X10)
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ADD $16, X10
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ADD $16, X11
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ADD $16, X12
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SUB $16, X13
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BEQZ X13, done
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loop4_check:
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MOV $4, X15
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BLT X13, X15, loop1
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PCALIGN $16
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loop4:
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MOVBU 0(X11), X16
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MOVBU 0(X12), X17
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MOVBU 1(X11), X18
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MOVBU 1(X12), X19
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XOR X16, X17
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XOR X18, X19
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MOVB X17, 0(X10)
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MOVB X19, 1(X10)
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MOVBU 2(X11), X20
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MOVBU 2(X12), X21
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MOVBU 3(X11), X22
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MOVBU 3(X12), X23
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XOR X20, X21
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XOR X22, X23
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MOVB X21, 2(X10)
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MOVB X23, 3(X10)
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ADD $4, X10
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ADD $4, X11
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ADD $4, X12
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SUB $4, X13
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BGE X13, X15, loop4
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PCALIGN $16
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loop1:
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BEQZ X13, done
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MOVBU 0(X11), X16
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MOVBU 0(X12), X17
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XOR X16, X17
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MOVB X17, 0(X10)
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ADD $1, X10
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ADD $1, X11
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ADD $1, X12
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SUB $1, X13
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JMP loop1
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done:
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RET
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