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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 | /* SPDX-License-Identifier: GPL-2.0 */ // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. #include <linux/linkage.h> #include "sysdep.h" ENTRY(strcmp) mov a3, a0 /* Check if the s1 addr is aligned. */ xor a2, a3, a1 andi a2, 0x3 bnez a2, 7f andi t1, a0, 0x3 bnez t1, 5f 1: /* If aligned, load word each time. */ ldw t0, (a3, 0) ldw t1, (a1, 0) /* If s1[i] != s2[i], goto 2f. */ cmpne t0, t1 bt 2f /* If s1[i] == s2[i], check if s1 or s2 is at the end. */ tstnbz t0 /* If at the end, goto 3f (finish comparing). */ bf 3f ldw t0, (a3, 4) ldw t1, (a1, 4) cmpne t0, t1 bt 2f tstnbz t0 bf 3f ldw t0, (a3, 8) ldw t1, (a1, 8) cmpne t0, t1 bt 2f tstnbz t0 bf 3f ldw t0, (a3, 12) ldw t1, (a1, 12) cmpne t0, t1 bt 2f tstnbz t0 bf 3f ldw t0, (a3, 16) ldw t1, (a1, 16) cmpne t0, t1 bt 2f tstnbz t0 bf 3f ldw t0, (a3, 20) ldw t1, (a1, 20) cmpne t0, t1 bt 2f tstnbz t0 bf 3f ldw t0, (a3, 24) ldw t1, (a1, 24) cmpne t0, t1 bt 2f tstnbz t0 bf 3f ldw t0, (a3, 28) ldw t1, (a1, 28) cmpne t0, t1 bt 2f tstnbz t0 bf 3f addi a3, 32 addi a1, 32 br 1b # ifdef __CSKYBE__ /* d[i] != s[i] in word, so we check byte 0. */ 2: xtrb0 a0, t0 xtrb0 a2, t1 subu a0, a2 bez a2, 4f bnez a0, 4f /* check byte 1 */ xtrb1 a0, t0 xtrb1 a2, t1 subu a0, a2 bez a2, 4f bnez a0, 4f /* check byte 2 */ xtrb2 a0, t0 xtrb2 a2, t1 subu a0, a2 bez a2, 4f bnez a0, 4f /* check byte 3 */ xtrb3 a0, t0 xtrb3 a2, t1 subu a0, a2 # else /* s1[i] != s2[i] in word, so we check byte 3. */ 2: xtrb3 a0, t0 xtrb3 a2, t1 subu a0, a2 bez a2, 4f bnez a0, 4f /* check byte 2 */ xtrb2 a0, t0 xtrb2 a2, t1 subu a0, a2 bez a2, 4f bnez a0, 4f /* check byte 1 */ xtrb1 a0, t0 xtrb1 a2, t1 subu a0, a2 bez a2, 4f bnez a0, 4f /* check byte 0 */ xtrb0 a0, t0 xtrb0 a2, t1 subu a0, a2 # endif /* !__CSKYBE__ */ jmp lr 3: movi a0, 0 4: jmp lr /* Compare when s1 or s2 is not aligned. */ 5: subi t1, 4 6: ldb a0, (a3, 0) ldb a2, (a1, 0) subu a0, a2 bez a2, 4b bnez a0, 4b addi t1, 1 addi a1, 1 addi a3, 1 bnez t1, 6b br 1b 7: ldb a0, (a3, 0) addi a3, 1 ldb a2, (a1, 0) addi a1, 1 subu a0, a2 bnez a0, 4b bnez a2, 7b jmp r15 ENDPROC(strcmp) |