1/* 2 * Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com) 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 */ 8 9#include <linux/linkage.h> 10 11ENTRY_CFI(strcmp) 12 or r2, r0, r1 13 bmsk_s r2, r2, 1 14 brne r2, 0, @.Lcharloop 15 16;;; s1 and s2 are word aligned 17 ld.ab r2, [r0, 4] 18 19 mov_s r12, 0x01010101 20 ror r11, r12 21 .align 4 22.LwordLoop: 23 ld.ab r3, [r1, 4] 24 ;; Detect NULL char in str1 25 sub r4, r2, r12 26 ld.ab r5, [r0, 4] 27 bic r4, r4, r2 28 and r4, r4, r11 29 brne.d.nt r4, 0, .LfoundNULL 30 ;; Check if the read locations are the same 31 cmp r2, r3 32 beq.d .LwordLoop 33 mov.eq r2, r5 34 35 ;; A match is found, spot it out 36#ifdef __LITTLE_ENDIAN__ 37 swape r3, r3 38 mov_s r0, 1 39 swape r2, r2 40#else 41 mov_s r0, 1 42#endif 43 cmp_s r2, r3 44 j_s.d [blink] 45 bset.lo r0, r0, 31 46 47 .align 4 48.LfoundNULL: 49#ifdef __BIG_ENDIAN__ 50 swape r4, r4 51 swape r2, r2 52 swape r3, r3 53#endif 54 ;; Find null byte 55 ffs r0, r4 56 bmsk r2, r2, r0 57 bmsk r3, r3, r0 58 swape r2, r2 59 swape r3, r3 60 ;; make the return value 61 sub.f r0, r2, r3 62 mov.hi r0, 1 63 j_s.d [blink] 64 bset.lo r0, r0, 31 65 66 .align 4 67.Lcharloop: 68 ldb.ab r2, [r0, 1] 69 ldb.ab r3, [r1, 1] 70 nop 71 breq r2, 0, .Lcmpend 72 breq r2, r3, .Lcharloop 73 74 .align 4 75.Lcmpend: 76 j_s.d [blink] 77 sub r0, r2, r3 78END_CFI(strcmp) 79