| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* |
| * Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com) |
| */ |
| |
| #include <linux/linkage.h> |
| |
| ENTRY_CFI(strcmp) |
| or r2, r0, r1 |
| bmsk_s r2, r2, 1 |
| brne r2, 0, @.Lcharloop |
| |
| ;;; s1 and s2 are word aligned |
| ld.ab r2, [r0, 4] |
| |
| mov_s r12, 0x01010101 |
| ror r11, r12 |
| .align 4 |
| .LwordLoop: |
| ld.ab r3, [r1, 4] |
| ;; Detect NULL char in str1 |
| sub r4, r2, r12 |
| ld.ab r5, [r0, 4] |
| bic r4, r4, r2 |
| and r4, r4, r11 |
| brne.d.nt r4, 0, .LfoundNULL |
| ;; Check if the read locations are the same |
| cmp r2, r3 |
| beq.d .LwordLoop |
| mov.eq r2, r5 |
| |
| ;; A match is found, spot it out |
| #ifdef __LITTLE_ENDIAN__ |
| swape r3, r3 |
| mov_s r0, 1 |
| swape r2, r2 |
| #else |
| mov_s r0, 1 |
| #endif |
| cmp_s r2, r3 |
| j_s.d [blink] |
| bset.lo r0, r0, 31 |
| |
| .align 4 |
| .LfoundNULL: |
| #ifdef __BIG_ENDIAN__ |
| swape r4, r4 |
| swape r2, r2 |
| swape r3, r3 |
| #endif |
| ;; Find null byte |
| ffs r0, r4 |
| bmsk r2, r2, r0 |
| bmsk r3, r3, r0 |
| swape r2, r2 |
| swape r3, r3 |
| ;; make the return value |
| sub.f r0, r2, r3 |
| mov.hi r0, 1 |
| j_s.d [blink] |
| bset.lo r0, r0, 31 |
| |
| .align 4 |
| .Lcharloop: |
| ldb.ab r2, [r0, 1] |
| ldb.ab r3, [r1, 1] |
| nop |
| breq r2, 0, .Lcmpend |
| breq r2, r3, .Lcharloop |
| |
| .align 4 |
| .Lcmpend: |
| j_s.d [blink] |
| sub r0, r2, r3 |
| END_CFI(strcmp) |
