| 1 | /* SPDX-License-Identifier: GPL-2.0-only */
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| 2 | /*
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| 3 | * Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com)
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| 4 | */
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| 5 |
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| 6 | |
| 7 |
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| 8 | ENTRY_CFI(strcmp)
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| 9 | or r2, r0, r1
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| 10 | bmsk_s r2, r2, 1
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| 11 | brne r2, 0, @.Lcharloop
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| 12 |
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| 13 | ;;; s1 and s2 are word aligned
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| 14 | ld.ab r2, [r0, 4]
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| 15 |
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| 16 | mov_s r12, 0x01010101
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| 17 | ror r11, r12
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| 18 | .align 4
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| 19 | .LwordLoop:
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| 20 | ld.ab r3, [r1, 4]
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| 21 | ;; Detect NULL char in str1
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| 22 | sub r4, r2, r12
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| 23 | ld.ab r5, [r0, 4]
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| 24 | bic r4, r4, r2
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| 25 | and r4, r4, r11
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| 26 | brne.d.nt r4, 0, .LfoundNULL
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| 27 | ;; Check if the read locations are the same
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| 28 | cmp r2, r3
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| 29 | beq.d .LwordLoop
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| 30 | mov.eq r2, r5
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| 31 |
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| 32 | ;; A match is found, spot it out
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| 33 | |
| 34 | swape r3, r3
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| 35 | mov_s r0, 1
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| 36 | swape r2, r2
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| 37 | |
| 38 | mov_s r0, 1
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| 39 | |
| 40 | cmp_s r2, r3
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| 41 | j_s.d [blink]
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| 42 | bset.lo r0, r0, 31
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| 43 |
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| 44 | .align 4
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| 45 | .LfoundNULL:
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| 46 | |
| 47 | swape r4, r4
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| 48 | swape r2, r2
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| 49 | swape r3, r3
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| 50 | |
| 51 | ;; Find null byte
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| 52 | ffs r0, r4
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| 53 | bmsk r2, r2, r0
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| 54 | bmsk r3, r3, r0
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| 55 | swape r2, r2
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| 56 | swape r3, r3
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| 57 | ;; make the return value
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| 58 | sub.f r0, r2, r3
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| 59 | mov.hi r0, 1
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| 60 | j_s.d [blink]
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| 61 | bset.lo r0, r0, 31
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| 62 |
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| 63 | .align 4
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| 64 | .Lcharloop:
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| 65 | ldb.ab r2, [r0, 1]
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| 66 | ldb.ab r3, [r1, 1]
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| 67 | nop
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| 68 | breq r2, 0, .Lcmpend
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| 69 | breq r2, r3, .Lcharloop
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| 70 |
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| 71 | .align 4
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| 72 | .Lcmpend:
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| 73 | j_s.d [blink]
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| 74 | sub r0, r2, r3
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| 75 | END_CFI(strcmp)
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