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