1// Copyright 2025 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5//go:build (mips64 || mips64le) && !purego
6
7#include "textflag.h"
8
9// func xorBytes(dst, a, b *byte, n int)
10TEXT ·xorBytes(SB), NOSPLIT|NOFRAME, $0
11 MOVV dst+0(FP), R1
12 MOVV a+8(FP), R2
13 MOVV b+16(FP), R3
14 MOVV n+24(FP), R4
15
16xor_64_check:
17 SGTU $64, R4, R5 // R5 = 1 if (64 > R4)
18 BNE R5, xor_32_check
19xor_64:
20 MOVV (R2), R6
21 MOVV 8(R2), R7
22 MOVV 16(R2), R8
23 MOVV 24(R2), R9
24 MOVV (R3), R10
25 MOVV 8(R3), R11
26 MOVV 16(R3), R12
27 MOVV 24(R3), R13
28 XOR R6, R10
29 XOR R7, R11
30 XOR R8, R12
31 XOR R9, R13
32 MOVV R10, (R1)
33 MOVV R11, 8(R1)
34 MOVV R12, 16(R1)
35 MOVV R13, 24(R1)
36 MOVV 32(R2), R6
37 MOVV 40(R2), R7
38 MOVV 48(R2), R8
39 MOVV 56(R2), R9
40 MOVV 32(R3), R10
41 MOVV 40(R3), R11
42 MOVV 48(R3), R12
43 MOVV 56(R3), R13
44 XOR R6, R10
45 XOR R7, R11
46 XOR R8, R12
47 XOR R9, R13
48 MOVV R10, 32(R1)
49 MOVV R11, 40(R1)
50 MOVV R12, 48(R1)
51 MOVV R13, 56(R1)
52 ADDV $64, R2
53 ADDV $64, R3
54 ADDV $64, R1
55 SUBV $64, R4
56 SGTU $64, R4, R5
57 BEQ R0, R5, xor_64
58 BEQ R0, R4, end
59
60xor_32_check:
61 SGTU $32, R4, R5
62 BNE R5, xor_16_check
63xor_32:
64 MOVV (R2), R6
65 MOVV 8(R2), R7
66 MOVV 16(R2), R8
67 MOVV 24(R2), R9
68 MOVV (R3), R10
69 MOVV 8(R3), R11
70 MOVV 16(R3), R12
71 MOVV 24(R3), R13
72 XOR R6, R10
73 XOR R7, R11
74 XOR R8, R12
75 XOR R9, R13
76 MOVV R10, (R1)
77 MOVV R11, 8(R1)
78 MOVV R12, 16(R1)
79 MOVV R13, 24(R1)
80 ADDV $32, R2
81 ADDV $32, R3
82 ADDV $32, R1
83 SUBV $32, R4
84 BEQ R0, R4, end
85
86xor_16_check:
87 SGTU $16, R4, R5
88 BNE R5, xor_8_check
89xor_16:
90 MOVV (R2), R6
91 MOVV 8(R2), R7
92 MOVV (R3), R8
93 MOVV 8(R3), R9
94 XOR R6, R8
95 XOR R7, R9
96 MOVV R8, (R1)
97 MOVV R9, 8(R1)
98 ADDV $16, R2
99 ADDV $16, R3
100 ADDV $16, R1
101 SUBV $16, R4
102 BEQ R0, R4, end
103
104xor_8_check:
105 SGTU $8, R4, R5
106 BNE R5, xor_4_check
107xor_8:
108 MOVV (R2), R6
109 MOVV (R3), R7
110 XOR R6, R7
111 MOVV R7, (R1)
112 ADDV $8, R1
113 ADDV $8, R2
114 ADDV $8, R3
115 SUBV $8, R4
116 BEQ R0, R4, end
117
118xor_4_check:
119 SGTU $4, R4, R5
120 BNE R5, xor_2_check
121xor_4:
122 MOVW (R2), R6
123 MOVW (R3), R7
124 XOR R6, R7
125 MOVW R7, (R1)
126 ADDV $4, R2
127 ADDV $4, R3
128 ADDV $4, R1
129 SUBV $4, R4
130 BEQ R0, R4, end
131
132xor_2_check:
133 SGTU $2, R4, R5
134 BNE R5, xor_1
135xor_2:
136 MOVH (R2), R6
137 MOVH (R3), R7
138 XOR R6, R7
139 MOVH R7, (R1)
140 ADDV $2, R2
141 ADDV $2, R3
142 ADDV $2, R1
143 SUBV $2, R4
144 BEQ R0, R4, end
145
146xor_1:
147 MOVB (R2), R6
148 MOVB (R3), R7
149 XOR R6, R7
150 MOVB R7, (R1)
151
152end:
153 RET
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