1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 2
3 /* 3 /*
4 * memcmp for PowerPC32 4 * memcmp for PowerPC32
5 * 5 *
6 * Copyright (C) 1996 Paul Mackerras. 6 * Copyright (C) 1996 Paul Mackerras.
7 * 7 *
8 */ 8 */
9 9
10 #include <linux/export.h> 10 #include <linux/export.h>
11 #include <asm/ppc_asm.h> 11 #include <asm/ppc_asm.h>
12 12
13 .text 13 .text
14 14
15 _GLOBAL(memcmp) 15 _GLOBAL(memcmp)
16 srawi. r7, r5, 2 /* Div 16 srawi. r7, r5, 2 /* Divide len by 4 */
17 mr r6, r3 17 mr r6, r3
18 beq- 3f 18 beq- 3f
19 mtctr r7 19 mtctr r7
20 li r7, 0 20 li r7, 0
21 1: lwzx r3, r6, r7 21 1: lwzx r3, r6, r7
22 lwzx r0, r4, r7 22 lwzx r0, r4, r7
23 addi r7, r7, 4 23 addi r7, r7, 4
24 cmplw cr0, r3, r0 24 cmplw cr0, r3, r0
25 bdnzt eq, 1b 25 bdnzt eq, 1b
26 bne 5f 26 bne 5f
27 3: andi. r3, r5, 3 27 3: andi. r3, r5, 3
28 beqlr 28 beqlr
29 cmplwi cr1, r3, 2 29 cmplwi cr1, r3, 2
30 blt- cr1, 4f 30 blt- cr1, 4f
31 lhzx r3, r6, r7 31 lhzx r3, r6, r7
32 lhzx r0, r4, r7 32 lhzx r0, r4, r7
33 addi r7, r7, 2 33 addi r7, r7, 2
34 subf. r3, r0, r3 34 subf. r3, r0, r3
35 beqlr cr1 35 beqlr cr1
36 bnelr 36 bnelr
37 4: lbzx r3, r6, r7 37 4: lbzx r3, r6, r7
38 lbzx r0, r4, r7 38 lbzx r0, r4, r7
39 subf. r3, r0, r3 39 subf. r3, r0, r3
40 blr 40 blr
41 5: li r3, 1 41 5: li r3, 1
42 bgtlr 42 bgtlr
43 li r3, -1 43 li r3, -1
44 blr 44 blr
45 EXPORT_SYMBOL(memcmp) 45 EXPORT_SYMBOL(memcmp)
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