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// Copyright 2022 The Pion Authors. All rights reserved.
// Use of this source code is governed by an MIT
// license that can be found in the LICENSE file.
#include "textflag.h"
// func xorBytesARM32(dst, a, b *byte, n int)
TEXT ·xorBytesARM32(SB), NOSPLIT|NOFRAME, $0
MOVW dst+0(FP), R0
MOVW a+4(FP), R1
MOVW b+8(FP), R2
MOVW n+12(FP), R3
CMP $4, R3
BLT less_than4
loop_4:
MOVW.P 4(R1), R4
MOVW.P 4(R2), R5
EOR R4, R5, R5
MOVW.P R5, 4(R0)
SUB $4, R3
CMP $4, R3
BGE loop_4
less_than4:
CMP $2, R3
BLT less_than2
MOVH.P 2(R1), R4
MOVH.P 2(R2), R5
EOR R4, R5, R5
MOVH.P R5, 2(R0)
SUB $2, R3
less_than2:
CMP $0, R3
BEQ end
MOVB (R1), R4
MOVB (R2), R5
EOR R4, R5, R5
MOVB R5, (R0)
end:
RET
// func xorBytesNEON32(dst, a, b *byte, n int)
TEXT ·xorBytesNEON32(SB), NOSPLIT|NOFRAME, $0
MOVW dst+0(FP), R0
MOVW a+4(FP), R1
MOVW b+8(FP), R2
MOVW n+12(FP), R3
CMP $32, R3
BLT less_than32
loop_32:
WORD $0xF421020D // vld1.u8 {q0, q1}, [r1]!
WORD $0xF422420D // vld1.u8 {q2, q3}, [r2]!
WORD $0xF3004154 // veor q2, q0, q2
WORD $0xF3026156 // veor q3, q1, q3
WORD $0xF400420D // vst1.u8 {q2, q3}, [r0]!
SUB $32, R3
CMP $32, R3
BGE loop_32
less_than32:
CMP $16, R3
BLT less_than16
WORD $0xF4210A0D // vld1.u8 q0, [r1]!
WORD $0xF4222A0D // vld1.u8 q1, [r2]!
WORD $0xF3002152 // veor q1, q0, q1
WORD $0xF4002A0D // vst1.u8 {q1}, [r0]!
SUB $16, R3
less_than16:
CMP $8, R3
BLT less_than8
WORD $0xF421070D // vld1.u8 d0, [r1]!
WORD $0xF422170D // vld1.u8 d1, [r2]!
WORD $0xF3001111 // veor d1, d0, d1
WORD $0xF400170D // vst1.u8 {d1}, [r0]!
SUB $8, R3
less_than8:
CMP $4, R3
BLT less_than4
MOVW.P 4(R1), R4
MOVW.P 4(R2), R5
EOR R4, R5, R5
MOVW.P R5, 4(R0)
SUB $4, R3
less_than4:
CMP $2, R3
BLT less_than2
MOVH.P 2(R1), R4
MOVH.P 2(R2), R5
EOR R4, R5, R5
MOVH.P R5, 2(R0)
SUB $2, R3
less_than2:
CMP $0, R3
BEQ end
MOVB (R1), R4
MOVB (R2), R5
EOR R4, R5, R5
MOVB R5, (R0)
end:
RET
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