1// Copyright 2018 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#include "go_asm.h"
6#include "textflag.h"
7
8TEXT ·Compare(SB),NOSPLIT|NOFRAME,$0-56
9 MOVD a_base+0(FP), R3
10 MOVD a_len+8(FP), R4
11 MOVD b_base+24(FP), R5
12 MOVD b_len+32(FP), R6
13 LA ret+48(FP), R7
14 BR cmpbody<>(SB)
15
16TEXT runtime·cmpstring(SB),NOSPLIT|NOFRAME,$0-40
17 MOVD a_base+0(FP), R3
18 MOVD a_len+8(FP), R4
19 MOVD b_base+16(FP), R5
20 MOVD b_len+24(FP), R6
21 LA ret+32(FP), R7
22 BR cmpbody<>(SB)
23
24// input:
25// R3 = a
26// R4 = alen
27// R5 = b
28// R6 = blen
29// R7 = address of output word (stores -1/0/1 here)
30TEXT cmpbody<>(SB),NOSPLIT|NOFRAME,$0-0
31 CMPBEQ R3, R5, cmplengths
32 MOVD R4, R8
33 CMPBLE R4, R6, amin
34 MOVD R6, R8
35amin:
36 CMPBEQ R8, $0, cmplengths
37 CMP R8, $256
38 BLE tail
39loop:
40 CLC $256, 0(R3), 0(R5)
41 BGT gt
42 BLT lt
43 SUB $256, R8
44 MOVD $256(R3), R3
45 MOVD $256(R5), R5
46 CMP R8, $256
47 BGT loop
48tail:
49 SUB $1, R8
50 EXRL $cmpbodyclc<>(SB), R8
51 BGT gt
52 BLT lt
53cmplengths:
54 CMP R4, R6
55 BEQ eq
56 BLT lt
57gt:
58 MOVD $1, 0(R7)
59 RET
60lt:
61 MOVD $-1, 0(R7)
62 RET
63eq:
64 MOVD $0, 0(R7)
65 RET
66
67TEXT cmpbodyclc<>(SB),NOSPLIT|NOFRAME,$0-0
68 CLC $1, 0(R3), 0(R5)
69 RET
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