| Anton Blanchard | 15c2d45 | 2015-01-21 12:27:38 +1100 | [diff] [blame] | 1 | /* |
| 2 | * Author: Anton Blanchard <anton@au.ibm.com> |
| 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> |
| 11 | |
| 12 | #define off8 r6 |
| 13 | #define off16 r7 |
| 14 | #define off24 r8 |
| 15 | |
| 16 | #define rA r9 |
| 17 | #define rB r10 |
| 18 | #define rC r11 |
| 19 | #define rD r27 |
| 20 | #define rE r28 |
| 21 | #define rF r29 |
| 22 | #define rG r30 |
| 23 | #define rH r31 |
| 24 | |
| 25 | #ifdef __LITTLE_ENDIAN__ |
| 26 | #define LD ldbrx |
| 27 | #else |
| 28 | #define LD ldx |
| 29 | #endif |
| 30 | |
| 31 | _GLOBAL(memcmp) |
| 32 | cmpdi cr1,r5,0 |
| 33 | |
| 34 | /* Use the short loop if both strings are not 8B aligned */ |
| 35 | or r6,r3,r4 |
| 36 | andi. r6,r6,7 |
| 37 | |
| 38 | /* Use the short loop if length is less than 32B */ |
| 39 | cmpdi cr6,r5,31 |
| 40 | |
| 41 | beq cr1,.Lzero |
| 42 | bne .Lshort |
| 43 | bgt cr6,.Llong |
| 44 | |
| 45 | .Lshort: |
| 46 | mtctr r5 |
| 47 | |
| 48 | 1: lbz rA,0(r3) |
| 49 | lbz rB,0(r4) |
| 50 | subf. rC,rB,rA |
| 51 | bne .Lnon_zero |
| 52 | bdz .Lzero |
| 53 | |
| 54 | lbz rA,1(r3) |
| 55 | lbz rB,1(r4) |
| 56 | subf. rC,rB,rA |
| 57 | bne .Lnon_zero |
| 58 | bdz .Lzero |
| 59 | |
| 60 | lbz rA,2(r3) |
| 61 | lbz rB,2(r4) |
| 62 | subf. rC,rB,rA |
| 63 | bne .Lnon_zero |
| 64 | bdz .Lzero |
| 65 | |
| 66 | lbz rA,3(r3) |
| 67 | lbz rB,3(r4) |
| 68 | subf. rC,rB,rA |
| 69 | bne .Lnon_zero |
| 70 | |
| 71 | addi r3,r3,4 |
| 72 | addi r4,r4,4 |
| 73 | |
| 74 | bdnz 1b |
| 75 | |
| 76 | .Lzero: |
| 77 | li r3,0 |
| 78 | blr |
| 79 | |
| 80 | .Lnon_zero: |
| 81 | mr r3,rC |
| 82 | blr |
| 83 | |
| 84 | .Llong: |
| 85 | li off8,8 |
| 86 | li off16,16 |
| 87 | li off24,24 |
| 88 | |
| 89 | std r31,-8(r1) |
| 90 | std r30,-16(r1) |
| 91 | std r29,-24(r1) |
| 92 | std r28,-32(r1) |
| 93 | std r27,-40(r1) |
| 94 | |
| 95 | srdi r0,r5,5 |
| 96 | mtctr r0 |
| 97 | andi. r5,r5,31 |
| 98 | |
| 99 | LD rA,0,r3 |
| 100 | LD rB,0,r4 |
| 101 | |
| 102 | LD rC,off8,r3 |
| 103 | LD rD,off8,r4 |
| 104 | |
| 105 | LD rE,off16,r3 |
| 106 | LD rF,off16,r4 |
| 107 | |
| 108 | LD rG,off24,r3 |
| 109 | LD rH,off24,r4 |
| 110 | cmpld cr0,rA,rB |
| 111 | |
| 112 | addi r3,r3,32 |
| 113 | addi r4,r4,32 |
| 114 | |
| 115 | bdz .Lfirst32 |
| 116 | |
| 117 | LD rA,0,r3 |
| 118 | LD rB,0,r4 |
| 119 | cmpld cr1,rC,rD |
| 120 | |
| 121 | LD rC,off8,r3 |
| 122 | LD rD,off8,r4 |
| 123 | cmpld cr6,rE,rF |
| 124 | |
| 125 | LD rE,off16,r3 |
| 126 | LD rF,off16,r4 |
| 127 | cmpld cr7,rG,rH |
| 128 | bne cr0,.LcmpAB |
| 129 | |
| 130 | LD rG,off24,r3 |
| 131 | LD rH,off24,r4 |
| 132 | cmpld cr0,rA,rB |
| 133 | bne cr1,.LcmpCD |
| 134 | |
| 135 | addi r3,r3,32 |
| 136 | addi r4,r4,32 |
| 137 | |
| 138 | bdz .Lsecond32 |
| 139 | |
| 140 | .balign 16 |
| 141 | |
| 142 | 1: LD rA,0,r3 |
| 143 | LD rB,0,r4 |
| 144 | cmpld cr1,rC,rD |
| 145 | bne cr6,.LcmpEF |
| 146 | |
| 147 | LD rC,off8,r3 |
| 148 | LD rD,off8,r4 |
| 149 | cmpld cr6,rE,rF |
| 150 | bne cr7,.LcmpGH |
| 151 | |
| 152 | LD rE,off16,r3 |
| 153 | LD rF,off16,r4 |
| 154 | cmpld cr7,rG,rH |
| 155 | bne cr0,.LcmpAB |
| 156 | |
| 157 | LD rG,off24,r3 |
| 158 | LD rH,off24,r4 |
| 159 | cmpld cr0,rA,rB |
| 160 | bne cr1,.LcmpCD |
| 161 | |
| 162 | addi r3,r3,32 |
| 163 | addi r4,r4,32 |
| 164 | |
| 165 | bdnz 1b |
| 166 | |
| 167 | .Lsecond32: |
| 168 | cmpld cr1,rC,rD |
| 169 | bne cr6,.LcmpEF |
| 170 | |
| 171 | cmpld cr6,rE,rF |
| 172 | bne cr7,.LcmpGH |
| 173 | |
| 174 | cmpld cr7,rG,rH |
| 175 | bne cr0,.LcmpAB |
| 176 | |
| 177 | bne cr1,.LcmpCD |
| 178 | bne cr6,.LcmpEF |
| 179 | bne cr7,.LcmpGH |
| 180 | |
| 181 | .Ltail: |
| 182 | ld r31,-8(r1) |
| 183 | ld r30,-16(r1) |
| 184 | ld r29,-24(r1) |
| 185 | ld r28,-32(r1) |
| 186 | ld r27,-40(r1) |
| 187 | |
| 188 | cmpdi r5,0 |
| 189 | beq .Lzero |
| 190 | b .Lshort |
| 191 | |
| 192 | .Lfirst32: |
| 193 | cmpld cr1,rC,rD |
| 194 | cmpld cr6,rE,rF |
| 195 | cmpld cr7,rG,rH |
| 196 | |
| 197 | bne cr0,.LcmpAB |
| 198 | bne cr1,.LcmpCD |
| 199 | bne cr6,.LcmpEF |
| 200 | bne cr7,.LcmpGH |
| 201 | |
| 202 | b .Ltail |
| 203 | |
| 204 | .LcmpAB: |
| 205 | li r3,1 |
| 206 | bgt cr0,.Lout |
| 207 | li r3,-1 |
| 208 | b .Lout |
| 209 | |
| 210 | .LcmpCD: |
| 211 | li r3,1 |
| 212 | bgt cr1,.Lout |
| 213 | li r3,-1 |
| 214 | b .Lout |
| 215 | |
| 216 | .LcmpEF: |
| 217 | li r3,1 |
| 218 | bgt cr6,.Lout |
| 219 | li r3,-1 |
| 220 | b .Lout |
| 221 | |
| 222 | .LcmpGH: |
| 223 | li r3,1 |
| 224 | bgt cr7,.Lout |
| 225 | li r3,-1 |
| 226 | |
| 227 | .Lout: |
| 228 | ld r31,-8(r1) |
| 229 | ld r30,-16(r1) |
| 230 | ld r29,-24(r1) |
| 231 | ld r28,-32(r1) |
| 232 | ld r27,-40(r1) |
| 233 | blr |