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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 | /* * Author: Anton Blanchard <anton@au.ibm.com> * Copyright 2015 IBM Corporation. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include <asm/ppc_asm.h> #include <asm/export.h> #define off8 r6 #define off16 r7 #define off24 r8 #define rA r9 #define rB r10 #define rC r11 #define rD r27 #define rE r28 #define rF r29 #define rG r30 #define rH r31 #ifdef __LITTLE_ENDIAN__ #define LD ldbrx #else #define LD ldx #endif _GLOBAL(memcmp) cmpdi cr1,r5,0 /* Use the short loop if both strings are not 8B aligned */ or r6,r3,r4 andi. r6,r6,7 /* Use the short loop if length is less than 32B */ cmpdi cr6,r5,31 beq cr1,.Lzero bne .Lshort bgt cr6,.Llong .Lshort: mtctr r5 1: lbz rA,0(r3) lbz rB,0(r4) subf. rC,rB,rA bne .Lnon_zero bdz .Lzero lbz rA,1(r3) lbz rB,1(r4) subf. rC,rB,rA bne .Lnon_zero bdz .Lzero lbz rA,2(r3) lbz rB,2(r4) subf. rC,rB,rA bne .Lnon_zero bdz .Lzero lbz rA,3(r3) lbz rB,3(r4) subf. rC,rB,rA bne .Lnon_zero addi r3,r3,4 addi r4,r4,4 bdnz 1b .Lzero: li r3,0 blr .Lnon_zero: mr r3,rC blr .Llong: li off8,8 li off16,16 li off24,24 std r31,-8(r1) std r30,-16(r1) std r29,-24(r1) std r28,-32(r1) std r27,-40(r1) srdi r0,r5,5 mtctr r0 andi. r5,r5,31 LD rA,0,r3 LD rB,0,r4 LD rC,off8,r3 LD rD,off8,r4 LD rE,off16,r3 LD rF,off16,r4 LD rG,off24,r3 LD rH,off24,r4 cmpld cr0,rA,rB addi r3,r3,32 addi r4,r4,32 bdz .Lfirst32 LD rA,0,r3 LD rB,0,r4 cmpld cr1,rC,rD LD rC,off8,r3 LD rD,off8,r4 cmpld cr6,rE,rF LD rE,off16,r3 LD rF,off16,r4 cmpld cr7,rG,rH bne cr0,.LcmpAB LD rG,off24,r3 LD rH,off24,r4 cmpld cr0,rA,rB bne cr1,.LcmpCD addi r3,r3,32 addi r4,r4,32 bdz .Lsecond32 .balign 16 1: LD rA,0,r3 LD rB,0,r4 cmpld cr1,rC,rD bne cr6,.LcmpEF LD rC,off8,r3 LD rD,off8,r4 cmpld cr6,rE,rF bne cr7,.LcmpGH LD rE,off16,r3 LD rF,off16,r4 cmpld cr7,rG,rH bne cr0,.LcmpAB LD rG,off24,r3 LD rH,off24,r4 cmpld cr0,rA,rB bne cr1,.LcmpCD addi r3,r3,32 addi r4,r4,32 bdnz 1b .Lsecond32: cmpld cr1,rC,rD bne cr6,.LcmpEF cmpld cr6,rE,rF bne cr7,.LcmpGH cmpld cr7,rG,rH bne cr0,.LcmpAB bne cr1,.LcmpCD bne cr6,.LcmpEF bne cr7,.LcmpGH .Ltail: ld r31,-8(r1) ld r30,-16(r1) ld r29,-24(r1) ld r28,-32(r1) ld r27,-40(r1) cmpdi r5,0 beq .Lzero b .Lshort .Lfirst32: cmpld cr1,rC,rD cmpld cr6,rE,rF cmpld cr7,rG,rH bne cr0,.LcmpAB bne cr1,.LcmpCD bne cr6,.LcmpEF bne cr7,.LcmpGH b .Ltail .LcmpAB: li r3,1 bgt cr0,.Lout li r3,-1 b .Lout .LcmpCD: li r3,1 bgt cr1,.Lout li r3,-1 b .Lout .LcmpEF: li r3,1 bgt cr6,.Lout li r3,-1 b .Lout .LcmpGH: li r3,1 bgt cr7,.Lout li r3,-1 .Lout: ld r31,-8(r1) ld r30,-16(r1) ld r29,-24(r1) ld r28,-32(r1) ld r27,-40(r1) blr EXPORT_SYMBOL(memcmp) |