projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 88eefd34 | 1 | /* Vector optimized 32/64 bit S/390 version of rawmemchr. |
| bfff8b1b | 2 | Copyright (C) 2015-2017 Free Software Foundation, Inc. |
| 88eefd34 SL |
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, see | |
| 17 | <http://www.gnu.org/licenses/>. */ | |
| 18 | ||
| 19 | #if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) | |
| 20 | ||
| 21 | # include "sysdep.h" | |
| 22 | # include "asm-syntax.h" | |
| 23 | ||
| 24 | .text | |
| 25 | ||
| 26 | /* void *rawmemchr (const void *s, int c) | |
| 27 | Scans memory for character c | |
| 28 | and returns pointer to first c. | |
| 29 | ||
| 30 | Register usage: | |
| 31 | -r1=tmp | |
| 32 | -r2=s | |
| 33 | -r3=c | |
| 34 | -r4=tmp | |
| 35 | -r5=current_len | |
| 36 | -v16=part of s | |
| 37 | -v17=index of unequal | |
| 38 | -v18=c replicated | |
| 39 | */ | |
| 40 | ENTRY(__rawmemchr_vx) | |
| 41 | .machine "z13" | |
| 42 | .machinemode "zarch_nohighgprs" | |
| 43 | ||
| 44 | vlbb %v16,0(%r2),6 /* Load s until next 4k-byte boundary. */ | |
| 45 | lcbb %r1,0(%r2),6 /* Get bytes to 4k-byte boundary or 16. */ | |
| 46 | ||
| 47 | vlvgb %v18,%r3,0 /* Generate vector which elements are all c. | |
| 48 | If c > 255, c will be truncated. */ | |
| 49 | vrepb %v18,%v18,0 | |
| 50 | ||
| 51 | vfeeb %v17,%v16,%v18 /* Vector find element equal. */ | |
| 52 | vlgvb %r5,%v17,7 /* Load byte index of character or zero. */ | |
| 53 | clrjl %r5,%r1,.Lend_found /* If found c is in loaded bytes, end. */ | |
| 54 | ||
| 55 | /* Align s to 16 byte. */ | |
| 56 | risbgn %r1,%r2,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15. */ | |
| 57 | lghi %r5,16 | |
| 58 | slr %r5,%r1 /* Compute bytes to 16bytes boundary. */ | |
| 59 | ||
| 60 | /* Find c in a 16byte aligned loop. */ | |
| 61 | .Lloop: | |
| 62 | vl %v16,0(%r5,%r2) /* Load s. */ | |
| 63 | vfeebs %v17,%v16,%v18 /* Vector find element equal. */ | |
| 64 | jno .Lcharacter /* Jump away if element found. */ | |
| 65 | vl %v16,16(%r5,%r2) | |
| 66 | vfeebs %v17,%v16,%v18 | |
| 67 | jno .Lcharacter16 | |
| 68 | vl %v16,32(%r5,%r2) | |
| 69 | vfeebs %v17,%v16,%v18 | |
| 70 | jno .Lcharacter32 | |
| 71 | vl %v16,48(%r5,%r2) | |
| 72 | vfeebs %v17,%v16,%v18 | |
| 73 | jno .Lcharacter48 | |
| 74 | ||
| 75 | aghi %r5,64 | |
| 76 | j .Lloop /* No character found -> loop. */ | |
| 77 | ||
| 78 | /* Found character. */ | |
| 79 | .Lcharacter48: | |
| 80 | aghi %r5,16 | |
| 81 | .Lcharacter32: | |
| 82 | aghi %r5,16 | |
| 83 | .Lcharacter16: | |
| 84 | aghi %r5,16 | |
| 85 | .Lcharacter: | |
| 86 | vlgvb %r1,%v17,7 /* Load byte index of character. */ | |
| 87 | algr %r5,%r1 | |
| 88 | .Lend_found: | |
| 89 | la %r2,0(%r5,%r2) /* Return pointer to character. */ | |
| 90 | br %r14 | |
| 91 | END(__rawmemchr_vx) | |
| 92 | #endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */ |