projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
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| 0ecb606c JJ |
1 | /* Optimized strcmp implementation for PowerPC64. |
| 2 | Copyright (C) 2003, 2006 Free Software Foundation, Inc. | |
| 3 | This file is part of the GNU C Library. | |
| 4 | ||
| 5 | The GNU C Library is free software; you can redistribute it and/or | |
| 6 | modify it under the terms of the GNU Lesser General Public | |
| 7 | License as published by the Free Software Foundation; either | |
| 8 | version 2.1 of the License, or (at your option) any later version. | |
| 9 | ||
| 10 | The GNU C Library is distributed in the hope that it will be useful, | |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 | Lesser General Public License for more details. | |
| 14 | ||
| 15 | You should have received a copy of the GNU Lesser General Public | |
| 16 | License along with the GNU C Library; if not, write to the Free | |
| 17 | Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA | |
| 18 | 02110-1301 USA. */ | |
| 19 | ||
| 20 | #include <sysdep.h> | |
| 21 | #include <bp-sym.h> | |
| 22 | #include <bp-asm.h> | |
| 23 | ||
| 24 | /* int [r3] memcmp (const char *s1 [r3], const char *s2 [r4], size_t size [r5]) */ | |
| 25 | ||
| 26 | EALIGN (BP_SYM(memcmp), 4, 0) | |
| 27 | CALL_MCOUNT | |
| 28 | ||
| 29 | #define rTMP r0 | |
| 30 | #define rRTN r3 | |
| 31 | #define rSTR1 r3 /* first string arg */ | |
| 32 | #define rSTR2 r4 /* second string arg */ | |
| 33 | #define rN r5 /* max string length */ | |
| 34 | #define rWORD1 r6 /* current word in s1 */ | |
| 35 | #define rWORD2 r7 /* current word in s2 */ | |
| 36 | #define rWORD3 r8 /* next word in s1 */ | |
| 37 | #define rWORD4 r9 /* next word in s2 */ | |
| 38 | #define rWORD5 r10 /* next word in s1 */ | |
| 39 | #define rWORD6 r11 /* next word in s2 */ | |
| 40 | #define rBITDIF r12 /* bits that differ in s1 & s2 words */ | |
| 41 | #define rWORD7 r30 /* next word in s1 */ | |
| 42 | #define rWORD8 r31 /* next word in s2 */ | |
| 43 | ||
| 44 | xor rTMP, rSTR2, rSTR1 | |
| 45 | cmplwi cr6, rN, 0 | |
| 46 | cmplwi cr1, rN, 12 | |
| 47 | clrlwi. rTMP, rTMP, 30 | |
| 48 | clrlwi rBITDIF, rSTR1, 30 | |
| 49 | cmplwi cr5, rBITDIF, 0 | |
| 50 | beq- cr6, L(zeroLength) | |
| 51 | dcbt 0,rSTR1 | |
| 52 | dcbt 0,rSTR2 | |
| 53 | /* If less than 8 bytes or not aligned, use the unaligned | |
| 54 | byte loop. */ | |
| 55 | blt cr1, L(bytealigned) | |
| 56 | stwu 1,-64(1) | |
| 57 | cfi_adjust_cfa_offset(64) | |
| 58 | stw r31,48(1) | |
| 59 | cfi_offset(31,(48-64)) | |
| 60 | stw r30,44(1) | |
| 61 | cfi_offset(30,(44-64)) | |
| 62 | bne L(unaligned) | |
| 63 | /* At this point we know both strings have the same alignment and the | |
| 64 | compare length is at least 8 bytes. rBITDIF contains the low order | |
| 65 | 2 bits of rSTR1 and cr5 contains the result of the logical compare | |
| 66 | of rBITDIF to 0. If rBITDIF == 0 then we are already word | |
| 67 | aligned and can perform the word aligned loop. | |
| 68 | ||
| 69 | Otherwise we know the two strings have the same alignment (but not | |
| 70 | yet word aligned). So we force the string addresses to the next lower | |
| 71 | word boundary and special case this first word using shift left to | |
| 72 | eliminate bits preceeding the first byte. Since we want to join the | |
| 73 | normal (word aligned) compare loop, starting at the second word, | |
| 74 | we need to adjust the length (rN) and special case the loop | |
| 75 | versioning for the first word. This insures that the loop count is | |
| 76 | correct and the first word (shifted) is in the expected register pair. */ | |
| 77 | .align 4 | |
| 78 | L(samealignment): | |
| 79 | clrrwi rSTR1, rSTR1, 2 | |
| 80 | clrrwi rSTR2, rSTR2, 2 | |
| 81 | beq cr5, L(Waligned) | |
| 82 | add rN, rN, rBITDIF | |
| 83 | slwi r11, rBITDIF, 3 | |
| 84 | srwi rTMP, rN, 4 /* Divide by 16 */ | |
| 85 | andi. rBITDIF, rN, 12 /* Get the word remainder */ | |
| 86 | lwz rWORD1, 0(rSTR1) | |
| 87 | lwz rWORD2, 0(rSTR2) | |
| 88 | cmplwi cr1, rBITDIF, 8 | |
| 89 | cmplwi cr7, rN, 16 | |
| 90 | clrlwi rN, rN, 30 | |
| 91 | beq L(dPs4) | |
| 92 | mtctr rTMP /* Power4 wants mtctr 1st in dispatch group */ | |
| 93 | bgt cr1, L(dPs3) | |
| 94 | beq cr1, L(dPs2) | |
| 95 | ||
| 96 | /* Remainder is 4 */ | |
| 97 | .align 3 | |
| 98 | L(dsP1): | |
| 99 | slw rWORD5, rWORD1, r11 | |
| 100 | slw rWORD6, rWORD2, r11 | |
| 101 | cmplw cr5, rWORD5, rWORD6 | |
| 102 | blt cr7, L(dP1x) | |
| 103 | /* Do something useful in this cycle since we have to branch anyway. */ | |
| 104 | lwz rWORD1, 4(rSTR1) | |
| 105 | lwz rWORD2, 4(rSTR2) | |
| 106 | cmplw cr0, rWORD1, rWORD2 | |
| 107 | b L(dP1e) | |
| 108 | /* Remainder is 8 */ | |
| 109 | .align 4 | |
| 110 | L(dPs2): | |
| 111 | slw rWORD5, rWORD1, r11 | |
| 112 | slw rWORD6, rWORD2, r11 | |
| 113 | cmplw cr6, rWORD5, rWORD6 | |
| 114 | blt cr7, L(dP2x) | |
| 115 | /* Do something useful in this cycle since we have to branch anyway. */ | |
| 116 | lwz rWORD7, 4(rSTR1) | |
| 117 | lwz rWORD8, 4(rSTR2) | |
| 118 | cmplw cr5, rWORD7, rWORD8 | |
| 119 | b L(dP2e) | |
| 120 | /* Remainder is 12 */ | |
| 121 | .align 4 | |
| 122 | L(dPs3): | |
| 123 | slw rWORD3, rWORD1, r11 | |
| 124 | slw rWORD4, rWORD2, r11 | |
| 125 | cmplw cr1, rWORD3, rWORD4 | |
| 126 | b L(dP3e) | |
| 127 | /* Count is a multiple of 16, remainder is 0 */ | |
| 128 | .align 4 | |
| 129 | L(dPs4): | |
| 130 | mtctr rTMP /* Power4 wants mtctr 1st in dispatch group */ | |
| 131 | slw rWORD1, rWORD1, r11 | |
| 132 | slw rWORD2, rWORD2, r11 | |
| 133 | cmplw cr0, rWORD1, rWORD2 | |
| 134 | b L(dP4e) | |
| 135 | ||
| 136 | /* At this point we know both strings are word aligned and the | |
| 137 | compare length is at least 8 bytes. */ | |
| 138 | .align 4 | |
| 139 | L(Waligned): | |
| 140 | andi. rBITDIF, rN, 12 /* Get the word remainder */ | |
| 141 | srwi rTMP, rN, 4 /* Divide by 16 */ | |
| 142 | cmplwi cr1, rBITDIF, 8 | |
| 143 | cmplwi cr7, rN, 16 | |
| 144 | clrlwi rN, rN, 30 | |
| 145 | beq L(dP4) | |
| 146 | bgt cr1, L(dP3) | |
| 147 | beq cr1, L(dP2) | |
| 148 | ||
| 149 | /* Remainder is 4 */ | |
| 150 | .align 4 | |
| 151 | L(dP1): | |
| 152 | mtctr rTMP /* Power4 wants mtctr 1st in dispatch group */ | |
| 153 | /* Normally we'd use rWORD7/rWORD8 here, but since we might exit early | |
| 154 | (8-15 byte compare), we want to use only volatile registers. This | |
| 155 | means we can avoid restoring non-volatile registers since we did not | |
| 156 | change any on the early exit path. The key here is the non-early | |
| 157 | exit path only cares about the condition code (cr5), not about which | |
| 158 | register pair was used. */ | |
| 159 | lwz rWORD5, 0(rSTR1) | |
| 160 | lwz rWORD6, 0(rSTR2) | |
| 161 | cmplw cr5, rWORD5, rWORD6 | |
| 162 | blt cr7, L(dP1x) | |
| 163 | lwz rWORD1, 4(rSTR1) | |
| 164 | lwz rWORD2, 4(rSTR2) | |
| 165 | cmplw cr0, rWORD1, rWORD2 | |
| 166 | L(dP1e): | |
| 167 | lwz rWORD3, 8(rSTR1) | |
| 168 | lwz rWORD4, 8(rSTR2) | |
| 169 | cmplw cr1, rWORD3, rWORD4 | |
| 170 | lwz rWORD5, 12(rSTR1) | |
| 171 | lwz rWORD6, 12(rSTR2) | |
| 172 | cmplw cr6, rWORD5, rWORD6 | |
| 173 | bne cr5, L(dLcr5) | |
| 174 | bne cr0, L(dLcr0) | |
| 175 | ||
| 176 | lwzu rWORD7, 16(rSTR1) | |
| 177 | lwzu rWORD8, 16(rSTR2) | |
| 178 | bne cr1, L(dLcr1) | |
| 179 | cmplw cr5, rWORD7, rWORD8 | |
| 180 | bdnz L(dLoop) | |
| 181 | bne cr6, L(dLcr6) | |
| 182 | lwz r30,44(1) | |
| 183 | lwz r31,48(1) | |
| 184 | .align 3 | |
| 185 | L(dP1x): | |
| 186 | slwi. r12, rN, 3 | |
| 187 | bne cr5, L(dLcr5) | |
| 188 | subfic rN, r12, 32 /* Shift count is 32 - (rN * 8). */ | |
| 189 | lwz 1,0(1) | |
| 190 | bne L(d00) | |
| 191 | li rRTN, 0 | |
| 192 | blr | |
| 193 | ||
| 194 | /* Remainder is 8 */ | |
| 195 | .align 4 | |
| 196 | L(dP2): | |
| 197 | mtctr rTMP /* Power4 wants mtctr 1st in dispatch group */ | |
| 198 | lwz rWORD5, 0(rSTR1) | |
| 199 | lwz rWORD6, 0(rSTR2) | |
| 200 | cmplw cr6, rWORD5, rWORD6 | |
| 201 | blt cr7, L(dP2x) | |
| 202 | lwz rWORD7, 4(rSTR1) | |
| 203 | lwz rWORD8, 4(rSTR2) | |
| 204 | cmplw cr5, rWORD7, rWORD8 | |
| 205 | L(dP2e): | |
| 206 | lwz rWORD1, 8(rSTR1) | |
| 207 | lwz rWORD2, 8(rSTR2) | |
| 208 | cmplw cr0, rWORD1, rWORD2 | |
| 209 | lwz rWORD3, 12(rSTR1) | |
| 210 | lwz rWORD4, 12(rSTR2) | |
| 211 | cmplw cr1, rWORD3, rWORD4 | |
| 212 | addi rSTR1, rSTR1, 4 | |
| 213 | addi rSTR2, rSTR2, 4 | |
| 214 | bne cr6, L(dLcr6) | |
| 215 | bne cr5, L(dLcr5) | |
| 216 | b L(dLoop2) | |
| 217 | /* Again we are on a early exit path (16-23 byte compare), we want to | |
| 218 | only use volatile registers and avoid restoring non-volatile | |
| 219 | registers. */ | |
| 220 | .align 4 | |
| 221 | L(dP2x): | |
| 222 | lwz rWORD3, 4(rSTR1) | |
| 223 | lwz rWORD4, 4(rSTR2) | |
| 224 | cmplw cr5, rWORD3, rWORD4 | |
| 225 | slwi. r12, rN, 3 | |
| 226 | bne cr6, L(dLcr6) | |
| 227 | addi rSTR1, rSTR1, 4 | |
| 228 | addi rSTR2, rSTR2, 4 | |
| 229 | bne cr5, L(dLcr5) | |
| 230 | subfic rN, r12, 32 /* Shift count is 32 - (rN * 8). */ | |
| 231 | lwz 1,0(1) | |
| 232 | bne L(d00) | |
| 233 | li rRTN, 0 | |
| 234 | blr | |
| 235 | ||
| 236 | /* Remainder is 12 */ | |
| 237 | .align 4 | |
| 238 | L(dP3): | |
| 239 | mtctr rTMP /* Power4 wants mtctr 1st in dispatch group */ | |
| 240 | lwz rWORD3, 0(rSTR1) | |
| 241 | lwz rWORD4, 0(rSTR2) | |
| 242 | cmplw cr1, rWORD3, rWORD4 | |
| 243 | L(dP3e): | |
| 244 | lwz rWORD5, 4(rSTR1) | |
| 245 | lwz rWORD6, 4(rSTR2) | |
| 246 | cmplw cr6, rWORD5, rWORD6 | |
| 247 | blt cr7, L(dP3x) | |
| 248 | lwz rWORD7, 8(rSTR1) | |
| 249 | lwz rWORD8, 8(rSTR2) | |
| 250 | cmplw cr5, rWORD7, rWORD8 | |
| 251 | lwz rWORD1, 12(rSTR1) | |
| 252 | lwz rWORD2, 12(rSTR2) | |
| 253 | cmplw cr0, rWORD1, rWORD2 | |
| 254 | addi rSTR1, rSTR1, 8 | |
| 255 | addi rSTR2, rSTR2, 8 | |
| 256 | bne cr1, L(dLcr1) | |
| 257 | bne cr6, L(dLcr6) | |
| 258 | b L(dLoop1) | |
| 259 | /* Again we are on a early exit path (24-31 byte compare), we want to | |
| 260 | only use volatile registers and avoid restoring non-volatile | |
| 261 | registers. */ | |
| 262 | .align 4 | |
| 263 | L(dP3x): | |
| 264 | lwz rWORD1, 8(rSTR1) | |
| 265 | lwz rWORD2, 8(rSTR2) | |
| 266 | cmplw cr5, rWORD1, rWORD2 | |
| 267 | slwi. r12, rN, 3 | |
| 268 | bne cr1, L(dLcr1) | |
| 269 | addi rSTR1, rSTR1, 8 | |
| 270 | addi rSTR2, rSTR2, 8 | |
| 271 | bne cr6, L(dLcr6) | |
| 272 | subfic rN, r12, 32 /* Shift count is 32 - (rN * 8). */ | |
| 273 | bne cr5, L(dLcr5) | |
| 274 | lwz 1,0(1) | |
| 275 | bne L(d00) | |
| 276 | li rRTN, 0 | |
| 277 | blr | |
| 278 | ||
| 279 | /* Count is a multiple of 16, remainder is 0 */ | |
| 280 | .align 4 | |
| 281 | L(dP4): | |
| 282 | mtctr rTMP /* Power4 wants mtctr 1st in dispatch group */ | |
| 283 | lwz rWORD1, 0(rSTR1) | |
| 284 | lwz rWORD2, 0(rSTR2) | |
| 285 | cmplw cr0, rWORD1, rWORD2 | |
| 286 | L(dP4e): | |
| 287 | lwz rWORD3, 4(rSTR1) | |
| 288 | lwz rWORD4, 4(rSTR2) | |
| 289 | cmplw cr1, rWORD3, rWORD4 | |
| 290 | lwz rWORD5, 8(rSTR1) | |
| 291 | lwz rWORD6, 8(rSTR2) | |
| 292 | cmplw cr6, rWORD5, rWORD6 | |
| 293 | lwzu rWORD7, 12(rSTR1) | |
| 294 | lwzu rWORD8, 12(rSTR2) | |
| 295 | cmplw cr5, rWORD7, rWORD8 | |
| 296 | bne cr0, L(dLcr0) | |
| 297 | bne cr1, L(dLcr1) | |
| 298 | bdz- L(d24) /* Adjust CTR as we start with +4 */ | |
| 299 | /* This is the primary loop */ | |
| 300 | .align 4 | |
| 301 | L(dLoop): | |
| 302 | lwz rWORD1, 4(rSTR1) | |
| 303 | lwz rWORD2, 4(rSTR2) | |
| 304 | cmplw cr1, rWORD3, rWORD4 | |
| 305 | bne cr6, L(dLcr6) | |
| 306 | L(dLoop1): | |
| 307 | lwz rWORD3, 8(rSTR1) | |
| 308 | lwz rWORD4, 8(rSTR2) | |
| 309 | cmplw cr6, rWORD5, rWORD6 | |
| 310 | bne cr5, L(dLcr5) | |
| 311 | L(dLoop2): | |
| 312 | lwz rWORD5, 12(rSTR1) | |
| 313 | lwz rWORD6, 12(rSTR2) | |
| 314 | cmplw cr5, rWORD7, rWORD8 | |
| 315 | bne cr0, L(dLcr0) | |
| 316 | L(dLoop3): | |
| 317 | lwzu rWORD7, 16(rSTR1) | |
| 318 | lwzu rWORD8, 16(rSTR2) | |
| 319 | bne- cr1, L(dLcr1) | |
| 320 | cmplw cr0, rWORD1, rWORD2 | |
| 321 | bdnz+ L(dLoop) | |
| 322 | ||
| 323 | L(dL4): | |
| 324 | cmplw cr1, rWORD3, rWORD4 | |
| 325 | bne cr6, L(dLcr6) | |
| 326 | cmplw cr6, rWORD5, rWORD6 | |
| 327 | bne cr5, L(dLcr5) | |
| 328 | cmplw cr5, rWORD7, rWORD8 | |
| 329 | L(d44): | |
| 330 | bne cr0, L(dLcr0) | |
| 331 | L(d34): | |
| 332 | bne cr1, L(dLcr1) | |
| 333 | L(d24): | |
| 334 | bne cr6, L(dLcr6) | |
| 335 | L(d14): | |
| 336 | slwi. r12, rN, 3 | |
| 337 | bne cr5, L(dLcr5) | |
| 338 | L(d04): | |
| 339 | lwz r30,44(1) | |
| 340 | lwz r31,48(1) | |
| 341 | lwz 1,0(1) | |
| 342 | subfic rN, r12, 32 /* Shift count is 32 - (rN * 8). */ | |
| 343 | beq L(zeroLength) | |
| 344 | /* At this point we have a remainder of 1 to 3 bytes to compare. Since | |
| 345 | we are aligned it is safe to load the whole word, and use | |
| 346 | shift right to eliminate bits beyond the compare length. */ | |
| 347 | L(d00): | |
| 348 | lwz rWORD1, 4(rSTR1) | |
| 349 | lwz rWORD2, 4(rSTR2) | |
| 350 | srw rWORD1, rWORD1, rN | |
| 351 | srw rWORD2, rWORD2, rN | |
| 352 | cmplw rWORD1,rWORD2 | |
| 353 | li rRTN,0 | |
| 354 | beqlr | |
| 355 | li rRTN,1 | |
| 356 | bgtlr | |
| 357 | li rRTN,-1 | |
| 358 | blr | |
| 359 | ||
| 360 | .align 4 | |
| 361 | L(dLcr0): | |
| 362 | lwz r30,44(1) | |
| 363 | lwz r31,48(1) | |
| 364 | li rRTN, 1 | |
| 365 | lwz 1,0(1) | |
| 366 | bgtlr cr0 | |
| 367 | li rRTN, -1 | |
| 368 | blr | |
| 369 | .align 4 | |
| 370 | L(dLcr1): | |
| 371 | lwz r30,44(1) | |
| 372 | lwz r31,48(1) | |
| 373 | li rRTN, 1 | |
| 374 | lwz 1,0(1) | |
| 375 | bgtlr cr1 | |
| 376 | li rRTN, -1 | |
| 377 | blr | |
| 378 | .align 4 | |
| 379 | L(dLcr6): | |
| 380 | lwz r30,44(1) | |
| 381 | lwz r31,48(1) | |
| 382 | li rRTN, 1 | |
| 383 | lwz 1,0(1) | |
| 384 | bgtlr cr6 | |
| 385 | li rRTN, -1 | |
| 386 | blr | |
| 387 | .align 4 | |
| 388 | L(dLcr5): | |
| 389 | lwz r30,44(1) | |
| 390 | lwz r31,48(1) | |
| 391 | L(dLcr5x): | |
| 392 | li rRTN, 1 | |
| 393 | lwz 1,0(1) | |
| 394 | bgtlr cr5 | |
| 395 | li rRTN, -1 | |
| 396 | blr | |
| 397 | ||
| 398 | .align 4 | |
| 399 | L(bytealigned): | |
| 400 | cfi_adjust_cfa_offset(-64) | |
| 401 | mtctr rN /* Power4 wants mtctr 1st in dispatch group */ | |
| 402 | ||
| 403 | /* We need to prime this loop. This loop is swing modulo scheduled | |
| 404 | to avoid pipe delays. The dependent instruction latencies (load to | |
| 405 | compare to conditional branch) is 2 to 3 cycles. In this loop each | |
| 406 | dispatch group ends in a branch and takes 1 cycle. Effectively | |
| 407 | the first iteration of the loop only serves to load operands and | |
| 408 | branches based on compares are delayed until the next loop. | |
| 409 | ||
| 410 | So we must precondition some registers and condition codes so that | |
| 411 | we don't exit the loop early on the first iteration. */ | |
| 412 | ||
| 413 | lbz rWORD1, 0(rSTR1) | |
| 414 | lbz rWORD2, 0(rSTR2) | |
| 415 | bdz- L(b11) | |
| 416 | cmplw cr0, rWORD1, rWORD2 | |
| 417 | lbz rWORD3, 1(rSTR1) | |
| 418 | lbz rWORD4, 1(rSTR2) | |
| 419 | bdz- L(b12) | |
| 420 | cmplw cr1, rWORD3, rWORD4 | |
| 421 | lbzu rWORD5, 2(rSTR1) | |
| 422 | lbzu rWORD6, 2(rSTR2) | |
| 423 | bdz- L(b13) | |
| 424 | .align 4 | |
| 425 | L(bLoop): | |
| 426 | lbzu rWORD1, 1(rSTR1) | |
| 427 | lbzu rWORD2, 1(rSTR2) | |
| 428 | bne- cr0, L(bLcr0) | |
| 429 | ||
| 430 | cmplw cr6, rWORD5, rWORD6 | |
| 431 | bdz- L(b3i) | |
| 432 | ||
| 433 | lbzu rWORD3, 1(rSTR1) | |
| 434 | lbzu rWORD4, 1(rSTR2) | |
| 435 | bne- cr1, L(bLcr1) | |
| 436 | ||
| 437 | cmplw cr0, rWORD1, rWORD2 | |
| 438 | bdz- L(b2i) | |
| 439 | ||
| 440 | lbzu rWORD5, 1(rSTR1) | |
| 441 | lbzu rWORD6, 1(rSTR2) | |
| 442 | bne- cr6, L(bLcr6) | |
| 443 | ||
| 444 | cmplw cr1, rWORD3, rWORD4 | |
| 445 | bdnz+ L(bLoop) | |
| 446 | ||
| 447 | /* We speculatively loading bytes before we have tested the previous | |
| 448 | bytes. But we must avoid overrunning the length (in the ctr) to | |
| 449 | prevent these speculative loads from causing a segfault. In this | |
| 450 | case the loop will exit early (before the all pending bytes are | |
| 451 | tested. In this case we must complete the pending operations | |
| 452 | before returning. */ | |
| 453 | L(b1i): | |
| 454 | bne- cr0, L(bLcr0) | |
| 455 | bne- cr1, L(bLcr1) | |
| 456 | b L(bx56) | |
| 457 | .align 4 | |
| 458 | L(b2i): | |
| 459 | bne- cr6, L(bLcr6) | |
| 460 | bne- cr0, L(bLcr0) | |
| 461 | b L(bx34) | |
| 462 | .align 4 | |
| 463 | L(b3i): | |
| 464 | bne- cr1, L(bLcr1) | |
| 465 | bne- cr6, L(bLcr6) | |
| 466 | b L(bx12) | |
| 467 | .align 4 | |
| 468 | L(bLcr0): | |
| 469 | li rRTN, 1 | |
| 470 | bgtlr cr0 | |
| 471 | li rRTN, -1 | |
| 472 | blr | |
| 473 | L(bLcr1): | |
| 474 | li rRTN, 1 | |
| 475 | bgtlr cr1 | |
| 476 | li rRTN, -1 | |
| 477 | blr | |
| 478 | L(bLcr6): | |
| 479 | li rRTN, 1 | |
| 480 | bgtlr cr6 | |
| 481 | li rRTN, -1 | |
| 482 | blr | |
| 483 | ||
| 484 | L(b13): | |
| 485 | bne- cr0, L(bx12) | |
| 486 | bne- cr1, L(bx34) | |
| 487 | L(bx56): | |
| 488 | sub rRTN, rWORD5, rWORD6 | |
| 489 | blr | |
| 490 | nop | |
| 491 | L(b12): | |
| 492 | bne- cr0, L(bx12) | |
| 493 | L(bx34): | |
| 494 | sub rRTN, rWORD3, rWORD4 | |
| 495 | blr | |
| 496 | ||
| 497 | L(b11): | |
| 498 | L(bx12): | |
| 499 | sub rRTN, rWORD1, rWORD2 | |
| 500 | blr | |
| 501 | ||
| 502 | .align 4 | |
| 503 | L(zeroLengthReturn): | |
| 504 | ||
| 505 | L(zeroLength): | |
| 506 | li rRTN, 0 | |
| 507 | blr | |
| 508 | ||
| 509 | cfi_adjust_cfa_offset(64) | |
| 510 | .align 4 | |
| 511 | /* At this point we know the strings have different alignment and the | |
| 512 | compare length is at least 8 bytes. rBITDIF contains the low order | |
| 513 | 2 bits of rSTR1 and cr5 contains the result of the logical compare | |
| 514 | of rBITDIF to 0. If rBITDIF == 0 then rStr1 is word aligned and can | |
| 515 | perform the Wunaligned loop. | |
| 516 | ||
| 517 | Otherwise we know that rSTR1 is not aready word aligned yet. | |
| 518 | So we can force the string addresses to the next lower word | |
| 519 | boundary and special case this first word using shift left to | |
| 520 | eliminate bits preceeding the first byte. Since we want to join the | |
| 521 | normal (Wualigned) compare loop, starting at the second word, | |
| 522 | we need to adjust the length (rN) and special case the loop | |
| 523 | versioning for the first W. This insures that the loop count is | |
| 524 | correct and the first W (shifted) is in the expected resister pair. */ | |
| 525 | #define rSHL r29 /* Unaligned shift left count. */ | |
| 526 | #define rSHR r28 /* Unaligned shift right count. */ | |
| 527 | #define rB r27 /* Left rotation temp for rWORD2. */ | |
| 528 | #define rD r26 /* Left rotation temp for rWORD4. */ | |
| 529 | #define rF r25 /* Left rotation temp for rWORD6. */ | |
| 530 | #define rH r24 /* Left rotation temp for rWORD8. */ | |
| 531 | #define rA r0 /* Right rotation temp for rWORD2. */ | |
| 532 | #define rC r12 /* Right rotation temp for rWORD4. */ | |
| 533 | #define rE r0 /* Right rotation temp for rWORD6. */ | |
| 534 | #define rG r12 /* Right rotation temp for rWORD8. */ | |
| 535 | L(unaligned): | |
| 536 | stw r29,40(r1) | |
| 537 | cfi_offset(r29,(40-64)) | |
| 538 | clrlwi rSHL, rSTR2, 30 | |
| 539 | stw r28,36(r1) | |
| 540 | cfi_offset(r28,(36-64)) | |
| 541 | beq cr5, L(Wunaligned) | |
| 542 | stw r27,32(r1) | |
| 543 | cfi_offset(r27,(32-64)) | |
| 544 | /* Adjust the logical start of rSTR2 to compensate for the extra bits | |
| 545 | in the 1st rSTR1 W. */ | |
| 546 | sub r27, rSTR2, rBITDIF | |
| 547 | /* But do not attempt to address the W before that W that contains | |
| 548 | the actual start of rSTR2. */ | |
| 549 | clrrwi rSTR2, rSTR2, 2 | |
| 550 | stw r26,28(r1) | |
| 551 | cfi_offset(r26,(28-64)) | |
| 552 | /* Compute the left/right shift counts for the unalign rSTR2, | |
| 553 | compensating for the logical (W aligned) start of rSTR1. */ | |
| 554 | clrlwi rSHL, r27, 30 | |
| 555 | clrrwi rSTR1, rSTR1, 2 | |
| 556 | stw r25,24(r1) | |
| 557 | cfi_offset(r25,(24-64)) | |
| 558 | slwi rSHL, rSHL, 3 | |
| 559 | cmplw cr5, r27, rSTR2 | |
| 560 | add rN, rN, rBITDIF | |
| 561 | slwi r11, rBITDIF, 3 | |
| 562 | stw r24,20(r1) | |
| 563 | cfi_offset(r24,(20-64)) | |
| 564 | subfic rSHR, rSHL, 32 | |
| 565 | srwi rTMP, rN, 4 /* Divide by 16 */ | |
| 566 | andi. rBITDIF, rN, 12 /* Get the W remainder */ | |
| 567 | /* We normally need to load 2 Ws to start the unaligned rSTR2, but in | |
| 568 | this special case those bits may be discarded anyway. Also we | |
| 569 | must avoid loading a W where none of the bits are part of rSTR2 as | |
| 570 | this may cross a page boundary and cause a page fault. */ | |
| 571 | li rWORD8, 0 | |
| 572 | blt cr5, L(dus0) | |
| 573 | lwz rWORD8, 0(rSTR2) | |
| 574 | la rSTR2, 4(rSTR2) | |
| 575 | slw rWORD8, rWORD8, rSHL | |
| 576 | ||
| 577 | L(dus0): | |
| 578 | lwz rWORD1, 0(rSTR1) | |
| 579 | lwz rWORD2, 0(rSTR2) | |
| 580 | cmplwi cr1, rBITDIF, 8 | |
| 581 | cmplwi cr7, rN, 16 | |
| 582 | srw rG, rWORD2, rSHR | |
| 583 | clrlwi rN, rN, 30 | |
| 584 | beq L(duPs4) | |
| 585 | mtctr rTMP /* Power4 wants mtctr 1st in dispatch group */ | |
| 586 | or rWORD8, rG, rWORD8 | |
| 587 | bgt cr1, L(duPs3) | |
| 588 | beq cr1, L(duPs2) | |
| 589 | ||
| 590 | /* Remainder is 4 */ | |
| 591 | .align 4 | |
| 592 | L(dusP1): | |
| 593 | slw rB, rWORD2, rSHL | |
| 594 | slw rWORD7, rWORD1, r11 | |
| 595 | slw rWORD8, rWORD8, r11 | |
| 596 | bge cr7, L(duP1e) | |
| 597 | /* At this point we exit early with the first word compare | |
| 598 | complete and remainder of 0 to 3 bytes. See L(du14) for details on | |
| 599 | how we handle the remaining bytes. */ | |
| 600 | cmplw cr5, rWORD7, rWORD8 | |
| 601 | slwi. rN, rN, 3 | |
| 602 | bne cr5, L(duLcr5) | |
| 603 | cmplw cr7, rN, rSHR | |
| 604 | beq L(duZeroReturn) | |
| 605 | li rA, 0 | |
| 606 | ble cr7, L(dutrim) | |
| 607 | lwz rWORD2, 4(rSTR2) | |
| 608 | srw rA, rWORD2, rSHR | |
| 609 | b L(dutrim) | |
| 610 | /* Remainder is 8 */ | |
| 611 | .align 4 | |
| 612 | L(duPs2): | |
| 613 | slw rH, rWORD2, rSHL | |
| 614 | slw rWORD5, rWORD1, r11 | |
| 615 | slw rWORD6, rWORD8, r11 | |
| 616 | b L(duP2e) | |
| 617 | /* Remainder is 12 */ | |
| 618 | .align 4 | |
| 619 | L(duPs3): | |
| 620 | slw rF, rWORD2, rSHL | |
| 621 | slw rWORD3, rWORD1, r11 | |
| 622 | slw rWORD4, rWORD8, r11 | |
| 623 | b L(duP3e) | |
| 624 | /* Count is a multiple of 16, remainder is 0 */ | |
| 625 | .align 4 | |
| 626 | L(duPs4): | |
| 627 | mtctr rTMP /* Power4 wants mtctr 1st in dispatch group */ | |
| 628 | or rWORD8, rG, rWORD8 | |
| 629 | slw rD, rWORD2, rSHL | |
| 630 | slw rWORD1, rWORD1, r11 | |
| 631 | slw rWORD2, rWORD8, r11 | |
| 632 | b L(duP4e) | |
| 633 | ||
| 634 | /* At this point we know rSTR1 is word aligned and the | |
| 635 | compare length is at least 8 bytes. */ | |
| 636 | .align 4 | |
| 637 | L(Wunaligned): | |
| 638 | stw r27,32(r1) | |
| 639 | cfi_offset(r27,(32-64)) | |
| 640 | clrrwi rSTR2, rSTR2, 2 | |
| 641 | stw r26,28(r1) | |
| 642 | cfi_offset(r26,(28-64)) | |
| 643 | srwi rTMP, rN, 4 /* Divide by 16 */ | |
| 644 | stw r25,24(r1) | |
| 645 | cfi_offset(r25,(24-64)) | |
| 646 | andi. rBITDIF, rN, 12 /* Get the W remainder */ | |
| 647 | stw r24,20(r1) | |
| 648 | cfi_offset(r24,(24-64)) | |
| 649 | slwi rSHL, rSHL, 3 | |
| 650 | lwz rWORD6, 0(rSTR2) | |
| 651 | lwzu rWORD8, 4(rSTR2) | |
| 652 | cmplwi cr1, rBITDIF, 8 | |
| 653 | cmplwi cr7, rN, 16 | |
| 654 | clrlwi rN, rN, 30 | |
| 655 | subfic rSHR, rSHL, 32 | |
| 656 | slw rH, rWORD6, rSHL | |
| 657 | beq L(duP4) | |
| 658 | mtctr rTMP /* Power4 wants mtctr 1st in dispatch group */ | |
| 659 | bgt cr1, L(duP3) | |
| 660 | beq cr1, L(duP2) | |
| 661 | ||
| 662 | /* Remainder is 4 */ | |
| 663 | .align 4 | |
| 664 | L(duP1): | |
| 665 | srw rG, rWORD8, rSHR | |
| 666 | lwz rWORD7, 0(rSTR1) | |
| 667 | slw rB, rWORD8, rSHL | |
| 668 | or rWORD8, rG, rH | |
| 669 | blt cr7, L(duP1x) | |
| 670 | L(duP1e): | |
| 671 | lwz rWORD1, 4(rSTR1) | |
| 672 | lwz rWORD2, 4(rSTR2) | |
| 673 | cmplw cr5, rWORD7, rWORD8 | |
| 674 | srw rA, rWORD2, rSHR | |
| 675 | slw rD, rWORD2, rSHL | |
| 676 | or rWORD2, rA, rB | |
| 677 | lwz rWORD3, 8(rSTR1) | |
| 678 | lwz rWORD4, 8(rSTR2) | |
| 679 | cmplw cr0, rWORD1, rWORD2 | |
| 680 | srw rC, rWORD4, rSHR | |
| 681 | slw rF, rWORD4, rSHL | |
| 682 | bne cr5, L(duLcr5) | |
| 683 | or rWORD4, rC, rD | |
| 684 | lwz rWORD5, 12(rSTR1) | |
| 685 | lwz rWORD6, 12(rSTR2) | |
| 686 | cmplw cr1, rWORD3, rWORD4 | |
| 687 | srw rE, rWORD6, rSHR | |
| 688 | slw rH, rWORD6, rSHL | |
| 689 | bne cr0, L(duLcr0) | |
| 690 | or rWORD6, rE, rF | |
| 691 | cmplw cr6, rWORD5, rWORD6 | |
| 692 | b L(duLoop3) | |
| 693 | .align 4 | |
| 694 | /* At this point we exit early with the first word compare | |
| 695 | complete and remainder of 0 to 3 bytes. See L(du14) for details on | |
| 696 | how we handle the remaining bytes. */ | |
| 697 | L(duP1x): | |
| 698 | cmplw cr5, rWORD7, rWORD8 | |
| 699 | slwi. rN, rN, 3 | |
| 700 | bne cr5, L(duLcr5) | |
| 701 | cmplw cr7, rN, rSHR | |
| 702 | beq L(duZeroReturn) | |
| 703 | li rA, 0 | |
| 704 | ble cr7, L(dutrim) | |
| 705 | ld rWORD2, 8(rSTR2) | |
| 706 | srw rA, rWORD2, rSHR | |
| 707 | b L(dutrim) | |
| 708 | /* Remainder is 8 */ | |
| 709 | .align 4 | |
| 710 | L(duP2): | |
| 711 | srw rE, rWORD8, rSHR | |
| 712 | lwz rWORD5, 0(rSTR1) | |
| 713 | or rWORD6, rE, rH | |
| 714 | slw rH, rWORD8, rSHL | |
| 715 | L(duP2e): | |
| 716 | lwz rWORD7, 4(rSTR1) | |
| 717 | lwz rWORD8, 4(rSTR2) | |
| 718 | cmplw cr6, rWORD5, rWORD6 | |
| 719 | srw rG, rWORD8, rSHR | |
| 720 | slw rB, rWORD8, rSHL | |
| 721 | or rWORD8, rG, rH | |
| 722 | blt cr7, L(duP2x) | |
| 723 | lwz rWORD1, 8(rSTR1) | |
| 724 | lwz rWORD2, 8(rSTR2) | |
| 725 | cmplw cr5, rWORD7, rWORD8 | |
| 726 | bne cr6, L(duLcr6) | |
| 727 | srw rA, rWORD2, rSHR | |
| 728 | slw rD, rWORD2, rSHL | |
| 729 | or rWORD2, rA, rB | |
| 730 | lwz rWORD3, 12(rSTR1) | |
| 731 | lwz rWORD4, 12(rSTR2) | |
| 732 | cmplw cr0, rWORD1, rWORD2 | |
| 733 | bne cr5, L(duLcr5) | |
| 734 | srw rC, rWORD4, rSHR | |
| 735 | slw rF, rWORD4, rSHL | |
| 736 | or rWORD4, rC, rD | |
| 737 | addi rSTR1, rSTR1, 4 | |
| 738 | addi rSTR2, rSTR2, 4 | |
| 739 | cmplw cr1, rWORD3, rWORD4 | |
| 740 | b L(duLoop2) | |
| 741 | .align 4 | |
| 742 | L(duP2x): | |
| 743 | cmplw cr5, rWORD7, rWORD8 | |
| 744 | addi rSTR1, rSTR1, 4 | |
| 745 | addi rSTR2, rSTR2, 4 | |
| 746 | bne cr6, L(duLcr6) | |
| 747 | slwi. rN, rN, 3 | |
| 748 | bne cr5, L(duLcr5) | |
| 749 | cmplw cr7, rN, rSHR | |
| 750 | beq L(duZeroReturn) | |
| 751 | li rA, 0 | |
| 752 | ble cr7, L(dutrim) | |
| 753 | lwz rWORD2, 4(rSTR2) | |
| 754 | srw rA, rWORD2, rSHR | |
| 755 | b L(dutrim) | |
| 756 | ||
| 757 | /* Remainder is 12 */ | |
| 758 | .align 4 | |
| 759 | L(duP3): | |
| 760 | srw rC, rWORD8, rSHR | |
| 761 | lwz rWORD3, 0(rSTR1) | |
| 762 | slw rF, rWORD8, rSHL | |
| 763 | or rWORD4, rC, rH | |
| 764 | L(duP3e): | |
| 765 | lwz rWORD5, 4(rSTR1) | |
| 766 | lwz rWORD6, 4(rSTR2) | |
| 767 | cmplw cr1, rWORD3, rWORD4 | |
| 768 | srw rE, rWORD6, rSHR | |
| 769 | slw rH, rWORD6, rSHL | |
| 770 | or rWORD6, rE, rF | |
| 771 | lwz rWORD7, 8(rSTR1) | |
| 772 | lwz rWORD8, 8(rSTR2) | |
| 773 | cmplw cr6, rWORD5, rWORD6 | |
| 774 | bne cr1, L(duLcr1) | |
| 775 | srw rG, rWORD8, rSHR | |
| 776 | slw rB, rWORD8, rSHL | |
| 777 | or rWORD8, rG, rH | |
| 778 | blt cr7, L(duP3x) | |
| 779 | lwz rWORD1, 12(rSTR1) | |
| 780 | lwz rWORD2, 12(rSTR2) | |
| 781 | cmplw cr5, rWORD7, rWORD8 | |
| 782 | bne cr6, L(duLcr6) | |
| 783 | srw rA, rWORD2, rSHR | |
| 784 | slw rD, rWORD2, rSHL | |
| 785 | or rWORD2, rA, rB | |
| 786 | addi rSTR1, rSTR1, 8 | |
| 787 | addi rSTR2, rSTR2, 8 | |
| 788 | cmplw cr0, rWORD1, rWORD2 | |
| 789 | b L(duLoop1) | |
| 790 | .align 4 | |
| 791 | L(duP3x): | |
| 792 | addi rSTR1, rSTR1, 8 | |
| 793 | addi rSTR2, rSTR2, 8 | |
| 794 | bne cr1, L(duLcr1) | |
| 795 | cmplw cr5, rWORD7, rWORD8 | |
| 796 | bne cr6, L(duLcr6) | |
| 797 | slwi. rN, rN, 3 | |
| 798 | bne cr5, L(duLcr5) | |
| 799 | cmplw cr7, rN, rSHR | |
| 800 | beq L(duZeroReturn) | |
| 801 | li rA, 0 | |
| 802 | ble cr7, L(dutrim) | |
| 803 | lwz rWORD2, 4(rSTR2) | |
| 804 | srw rA, rWORD2, rSHR | |
| 805 | b L(dutrim) | |
| 806 | ||
| 807 | /* Count is a multiple of 16, remainder is 0 */ | |
| 808 | .align 4 | |
| 809 | L(duP4): | |
| 810 | mtctr rTMP /* Power4 wants mtctr 1st in dispatch group */ | |
| 811 | srw rA, rWORD8, rSHR | |
| 812 | lwz rWORD1, 0(rSTR1) | |
| 813 | slw rD, rWORD8, rSHL | |
| 814 | or rWORD2, rA, rH | |
| 815 | L(duP4e): | |
| 816 | lwz rWORD3, 4(rSTR1) | |
| 817 | lwz rWORD4, 4(rSTR2) | |
| 818 | cmplw cr0, rWORD1, rWORD2 | |
| 819 | srw rC, rWORD4, rSHR | |
| 820 | slw rF, rWORD4, rSHL | |
| 821 | or rWORD4, rC, rD | |
| 822 | lwz rWORD5, 8(rSTR1) | |
| 823 | lwz rWORD6, 8(rSTR2) | |
| 824 | cmplw cr1, rWORD3, rWORD4 | |
| 825 | bne cr0, L(duLcr0) | |
| 826 | srw rE, rWORD6, rSHR | |
| 827 | slw rH, rWORD6, rSHL | |
| 828 | or rWORD6, rE, rF | |
| 829 | lwzu rWORD7, 12(rSTR1) | |
| 830 | lwzu rWORD8, 12(rSTR2) | |
| 831 | cmplw cr6, rWORD5, rWORD6 | |
| 832 | bne cr1, L(duLcr1) | |
| 833 | srw rG, rWORD8, rSHR | |
| 834 | slw rB, rWORD8, rSHL | |
| 835 | or rWORD8, rG, rH | |
| 836 | cmplw cr5, rWORD7, rWORD8 | |
| 837 | bdz- L(du24) /* Adjust CTR as we start with +4 */ | |
| 838 | /* This is the primary loop */ | |
| 839 | .align 4 | |
| 840 | L(duLoop): | |
| 841 | lwz rWORD1, 4(rSTR1) | |
| 842 | lwz rWORD2, 4(rSTR2) | |
| 843 | cmplw cr1, rWORD3, rWORD4 | |
| 844 | bne cr6, L(duLcr6) | |
| 845 | srw rA, rWORD2, rSHR | |
| 846 | slw rD, rWORD2, rSHL | |
| 847 | or rWORD2, rA, rB | |
| 848 | L(duLoop1): | |
| 849 | lwz rWORD3, 8(rSTR1) | |
| 850 | lwz rWORD4, 8(rSTR2) | |
| 851 | cmplw cr6, rWORD5, rWORD6 | |
| 852 | bne cr5, L(duLcr5) | |
| 853 | srw rC, rWORD4, rSHR | |
| 854 | slw rF, rWORD4, rSHL | |
| 855 | or rWORD4, rC, rD | |
| 856 | L(duLoop2): | |
| 857 | lwz rWORD5, 12(rSTR1) | |
| 858 | lwz rWORD6, 12(rSTR2) | |
| 859 | cmplw cr5, rWORD7, rWORD8 | |
| 860 | bne cr0, L(duLcr0) | |
| 861 | srw rE, rWORD6, rSHR | |
| 862 | slw rH, rWORD6, rSHL | |
| 863 | or rWORD6, rE, rF | |
| 864 | L(duLoop3): | |
| 865 | lwzu rWORD7, 16(rSTR1) | |
| 866 | lwzu rWORD8, 16(rSTR2) | |
| 867 | cmplw cr0, rWORD1, rWORD2 | |
| 868 | bne- cr1, L(duLcr1) | |
| 869 | srw rG, rWORD8, rSHR | |
| 870 | slw rB, rWORD8, rSHL | |
| 871 | or rWORD8, rG, rH | |
| 872 | bdnz+ L(duLoop) | |
| 873 | ||
| 874 | L(duL4): | |
| 875 | bne cr1, L(duLcr1) | |
| 876 | cmplw cr1, rWORD3, rWORD4 | |
| 877 | bne cr6, L(duLcr6) | |
| 878 | cmplw cr6, rWORD5, rWORD6 | |
| 879 | bne cr5, L(duLcr5) | |
| 880 | cmplw cr5, rWORD7, rWORD8 | |
| 881 | L(du44): | |
| 882 | bne cr0, L(duLcr0) | |
| 883 | L(du34): | |
| 884 | bne cr1, L(duLcr1) | |
| 885 | L(du24): | |
| 886 | bne cr6, L(duLcr6) | |
| 887 | L(du14): | |
| 888 | slwi. rN, rN, 3 | |
| 889 | bne cr5, L(duLcr5) | |
| 890 | /* At this point we have a remainder of 1 to 3 bytes to compare. We use | |
| 891 | shift right to eliminate bits beyond the compare length. | |
| 892 | ||
| 893 | However it may not be safe to load rWORD2 which may be beyond the | |
| 894 | string length. So we compare the bit length of the remainder to | |
| 895 | the right shift count (rSHR). If the bit count is less than or equal | |
| 896 | we do not need to load rWORD2 (all significant bits are already in | |
| 897 | rB). */ | |
| 898 | cmplw cr7, rN, rSHR | |
| 899 | beq L(duZeroReturn) | |
| 900 | li rA, 0 | |
| 901 | ble cr7, L(dutrim) | |
| 902 | lwz rWORD2, 4(rSTR2) | |
| 903 | srw rA, rWORD2, rSHR | |
| 904 | .align 4 | |
| 905 | L(dutrim): | |
| 906 | lwz rWORD1, 4(rSTR1) | |
| 907 | lwz r31,48(1) | |
| 908 | subfic rN, rN, 32 /* Shift count is 32 - (rN * 8). */ | |
| 909 | or rWORD2, rA, rB | |
| 910 | lwz r30,44(1) | |
| 911 | lwz r29,40(r1) | |
| 912 | srw rWORD1, rWORD1, rN | |
| 913 | srw rWORD2, rWORD2, rN | |
| 914 | lwz r28,36(r1) | |
| 915 | lwz r27,32(r1) | |
| 916 | cmplw rWORD1,rWORD2 | |
| 917 | li rRTN,0 | |
| 918 | beq L(dureturn26) | |
| 919 | li rRTN,1 | |
| 920 | bgt L(dureturn26) | |
| 921 | li rRTN,-1 | |
| 922 | b L(dureturn26) | |
| 923 | .align 4 | |
| 924 | L(duLcr0): | |
| 925 | lwz r31,48(1) | |
| 926 | lwz r30,44(1) | |
| 927 | li rRTN, 1 | |
| 928 | bgt cr0, L(dureturn29) | |
| 929 | lwz r29,40(r1) | |
| 930 | lwz r28,36(r1) | |
| 931 | li rRTN, -1 | |
| 932 | b L(dureturn27) | |
| 933 | .align 4 | |
| 934 | L(duLcr1): | |
| 935 | lwz r31,48(1) | |
| 936 | lwz r30,44(1) | |
| 937 | li rRTN, 1 | |
| 938 | bgt cr1, L(dureturn29) | |
| 939 | lwz r29,40(r1) | |
| 940 | lwz r28,36(r1) | |
| 941 | li rRTN, -1 | |
| 942 | b L(dureturn27) | |
| 943 | .align 4 | |
| 944 | L(duLcr6): | |
| 945 | lwz r31,48(1) | |
| 946 | lwz r30,44(1) | |
| 947 | li rRTN, 1 | |
| 948 | bgt cr6, L(dureturn29) | |
| 949 | lwz r29,40(r1) | |
| 950 | lwz r28,36(r1) | |
| 951 | li rRTN, -1 | |
| 952 | b L(dureturn27) | |
| 953 | .align 4 | |
| 954 | L(duLcr5): | |
| 955 | lwz r31,48(1) | |
| 956 | lwz r30,44(1) | |
| 957 | li rRTN, 1 | |
| 958 | bgt cr5, L(dureturn29) | |
| 959 | lwz r29,40(r1) | |
| 960 | lwz r28,36(r1) | |
| 961 | li rRTN, -1 | |
| 962 | b L(dureturn27) | |
| 963 | .align 3 | |
| 964 | L(duZeroReturn): | |
| 965 | li rRTN,0 | |
| 966 | .align 4 | |
| 967 | L(dureturn): | |
| 968 | lwz r31,48(1) | |
| 969 | lwz r30,44(1) | |
| 970 | L(dureturn29): | |
| 971 | lwz r29,40(r1) | |
| 972 | lwz r28,36(r1) | |
| 973 | L(dureturn27): | |
| 974 | lwz r27,32(r1) | |
| 975 | L(dureturn26): | |
| 976 | lwz r26,28(r1) | |
| 977 | L(dureturn25): | |
| 978 | lwz r25,24(r1) | |
| 979 | lwz r24,20(r1) | |
| 980 | lwz 1,0(1) | |
| 981 | blr | |
| 982 | END (BP_SYM (memcmp)) | |
| 983 | ||
| 984 | libc_hidden_builtin_def (memcmp) | |
| 985 | weak_alias (memcmp, bcmp) |