projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 15c2d45d AB |
1 | /* |
| 2 | * Author: Anton Blanchard <[email protected]> | |
| 3 | * Copyright 2015 IBM Corporation. | |
| 4 | * | |
| 5 | * This program is free software; you can redistribute it and/or | |
| 6 | * modify it under the terms of the GNU General Public License | |
| 7 | * as published by the Free Software Foundation; either version | |
| 8 | * 2 of the License, or (at your option) any later version. | |
| 9 | */ | |
| 10 | #include <asm/ppc_asm.h> | |
| 9445aa1a | 11 | #include <asm/export.h> |
| 15c2d45d AB |
12 | |
| 13 | #define off8 r6 | |
| 14 | #define off16 r7 | |
| 15 | #define off24 r8 | |
| 16 | ||
| 17 | #define rA r9 | |
| 18 | #define rB r10 | |
| 19 | #define rC r11 | |
| 20 | #define rD r27 | |
| 21 | #define rE r28 | |
| 22 | #define rF r29 | |
| 23 | #define rG r30 | |
| 24 | #define rH r31 | |
| 25 | ||
| 26 | #ifdef __LITTLE_ENDIAN__ | |
| 27 | #define LD ldbrx | |
| 28 | #else | |
| 29 | #define LD ldx | |
| 30 | #endif | |
| 31 | ||
| 32 | _GLOBAL(memcmp) | |
| 33 | cmpdi cr1,r5,0 | |
| 34 | ||
| 35 | /* Use the short loop if both strings are not 8B aligned */ | |
| 36 | or r6,r3,r4 | |
| 37 | andi. r6,r6,7 | |
| 38 | ||
| 39 | /* Use the short loop if length is less than 32B */ | |
| 40 | cmpdi cr6,r5,31 | |
| 41 | ||
| 42 | beq cr1,.Lzero | |
| 43 | bne .Lshort | |
| 44 | bgt cr6,.Llong | |
| 45 | ||
| 46 | .Lshort: | |
| 47 | mtctr r5 | |
| 48 | ||
| 49 | 1: lbz rA,0(r3) | |
| 50 | lbz rB,0(r4) | |
| 51 | subf. rC,rB,rA | |
| 52 | bne .Lnon_zero | |
| 53 | bdz .Lzero | |
| 54 | ||
| 55 | lbz rA,1(r3) | |
| 56 | lbz rB,1(r4) | |
| 57 | subf. rC,rB,rA | |
| 58 | bne .Lnon_zero | |
| 59 | bdz .Lzero | |
| 60 | ||
| 61 | lbz rA,2(r3) | |
| 62 | lbz rB,2(r4) | |
| 63 | subf. rC,rB,rA | |
| 64 | bne .Lnon_zero | |
| 65 | bdz .Lzero | |
| 66 | ||
| 67 | lbz rA,3(r3) | |
| 68 | lbz rB,3(r4) | |
| 69 | subf. rC,rB,rA | |
| 70 | bne .Lnon_zero | |
| 71 | ||
| 72 | addi r3,r3,4 | |
| 73 | addi r4,r4,4 | |
| 74 | ||
| 75 | bdnz 1b | |
| 76 | ||
| 77 | .Lzero: | |
| 78 | li r3,0 | |
| 79 | blr | |
| 80 | ||
| 81 | .Lnon_zero: | |
| 82 | mr r3,rC | |
| 83 | blr | |
| 84 | ||
| 85 | .Llong: | |
| 86 | li off8,8 | |
| 87 | li off16,16 | |
| 88 | li off24,24 | |
| 89 | ||
| 90 | std r31,-8(r1) | |
| 91 | std r30,-16(r1) | |
| 92 | std r29,-24(r1) | |
| 93 | std r28,-32(r1) | |
| 94 | std r27,-40(r1) | |
| 95 | ||
| 96 | srdi r0,r5,5 | |
| 97 | mtctr r0 | |
| 98 | andi. r5,r5,31 | |
| 99 | ||
| 100 | LD rA,0,r3 | |
| 101 | LD rB,0,r4 | |
| 102 | ||
| 103 | LD rC,off8,r3 | |
| 104 | LD rD,off8,r4 | |
| 105 | ||
| 106 | LD rE,off16,r3 | |
| 107 | LD rF,off16,r4 | |
| 108 | ||
| 109 | LD rG,off24,r3 | |
| 110 | LD rH,off24,r4 | |
| 111 | cmpld cr0,rA,rB | |
| 112 | ||
| 113 | addi r3,r3,32 | |
| 114 | addi r4,r4,32 | |
| 115 | ||
| 116 | bdz .Lfirst32 | |
| 117 | ||
| 118 | LD rA,0,r3 | |
| 119 | LD rB,0,r4 | |
| 120 | cmpld cr1,rC,rD | |
| 121 | ||
| 122 | LD rC,off8,r3 | |
| 123 | LD rD,off8,r4 | |
| 124 | cmpld cr6,rE,rF | |
| 125 | ||
| 126 | LD rE,off16,r3 | |
| 127 | LD rF,off16,r4 | |
| 128 | cmpld cr7,rG,rH | |
| 129 | bne cr0,.LcmpAB | |
| 130 | ||
| 131 | LD rG,off24,r3 | |
| 132 | LD rH,off24,r4 | |
| 133 | cmpld cr0,rA,rB | |
| 134 | bne cr1,.LcmpCD | |
| 135 | ||
| 136 | addi r3,r3,32 | |
| 137 | addi r4,r4,32 | |
| 138 | ||
| 139 | bdz .Lsecond32 | |
| 140 | ||
| 141 | .balign 16 | |
| 142 | ||
| 143 | 1: LD rA,0,r3 | |
| 144 | LD rB,0,r4 | |
| 145 | cmpld cr1,rC,rD | |
| 146 | bne cr6,.LcmpEF | |
| 147 | ||
| 148 | LD rC,off8,r3 | |
| 149 | LD rD,off8,r4 | |
| 150 | cmpld cr6,rE,rF | |
| 151 | bne cr7,.LcmpGH | |
| 152 | ||
| 153 | LD rE,off16,r3 | |
| 154 | LD rF,off16,r4 | |
| 155 | cmpld cr7,rG,rH | |
| 156 | bne cr0,.LcmpAB | |
| 157 | ||
| 158 | LD rG,off24,r3 | |
| 159 | LD rH,off24,r4 | |
| 160 | cmpld cr0,rA,rB | |
| 161 | bne cr1,.LcmpCD | |
| 162 | ||
| 163 | addi r3,r3,32 | |
| 164 | addi r4,r4,32 | |
| 165 | ||
| 166 | bdnz 1b | |
| 167 | ||
| 168 | .Lsecond32: | |
| 169 | cmpld cr1,rC,rD | |
| 170 | bne cr6,.LcmpEF | |
| 171 | ||
| 172 | cmpld cr6,rE,rF | |
| 173 | bne cr7,.LcmpGH | |
| 174 | ||
| 175 | cmpld cr7,rG,rH | |
| 176 | bne cr0,.LcmpAB | |
| 177 | ||
| 178 | bne cr1,.LcmpCD | |
| 179 | bne cr6,.LcmpEF | |
| 180 | bne cr7,.LcmpGH | |
| 181 | ||
| 182 | .Ltail: | |
| 183 | ld r31,-8(r1) | |
| 184 | ld r30,-16(r1) | |
| 185 | ld r29,-24(r1) | |
| 186 | ld r28,-32(r1) | |
| 187 | ld r27,-40(r1) | |
| 188 | ||
| 189 | cmpdi r5,0 | |
| 190 | beq .Lzero | |
| 191 | b .Lshort | |
| 192 | ||
| 193 | .Lfirst32: | |
| 194 | cmpld cr1,rC,rD | |
| 195 | cmpld cr6,rE,rF | |
| 196 | cmpld cr7,rG,rH | |
| 197 | ||
| 198 | bne cr0,.LcmpAB | |
| 199 | bne cr1,.LcmpCD | |
| 200 | bne cr6,.LcmpEF | |
| 201 | bne cr7,.LcmpGH | |
| 202 | ||
| 203 | b .Ltail | |
| 204 | ||
| 205 | .LcmpAB: | |
| 206 | li r3,1 | |
| 207 | bgt cr0,.Lout | |
| 208 | li r3,-1 | |
| 209 | b .Lout | |
| 210 | ||
| 211 | .LcmpCD: | |
| 212 | li r3,1 | |
| 213 | bgt cr1,.Lout | |
| 214 | li r3,-1 | |
| 215 | b .Lout | |
| 216 | ||
| 217 | .LcmpEF: | |
| 218 | li r3,1 | |
| 219 | bgt cr6,.Lout | |
| 220 | li r3,-1 | |
| 221 | b .Lout | |
| 222 | ||
| 223 | .LcmpGH: | |
| 224 | li r3,1 | |
| 225 | bgt cr7,.Lout | |
| 226 | li r3,-1 | |
| 227 | ||
| 228 | .Lout: | |
| 229 | ld r31,-8(r1) | |
| 230 | ld r30,-16(r1) | |
| 231 | ld r29,-24(r1) | |
| 232 | ld r28,-32(r1) | |
| 233 | ld r27,-40(r1) | |
| 234 | blr | |
| 9445aa1a | 235 | EXPORT_SYMBOL(memcmp) |