projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| f2121601 | 1 | /* Vector Optimized 32/64 bit S/390 version of wmemcmp. |
| f7a9f785 | 2 | Copyright (C) 2015-2016 Free Software Foundation, Inc. |
| f2121601 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 | /* int wmemcmp (const wchar_t *s1, const wchar_t *s2, size_t n) | |
| 27 | Compare at most n characters of two wchar_t-arrays. | |
| 28 | ||
| 29 | Register usage: | |
| 30 | -r0=tmp | |
| 31 | -r1=number of blocks | |
| 32 | -r2=s1 | |
| 33 | -r3=s2 | |
| 34 | -r4=n | |
| 35 | -r5=current_len | |
| 36 | -v16=part of s1 | |
| 37 | -v17=part of s2 | |
| 38 | -v18=index of unequal | |
| 39 | */ | |
| 40 | ENTRY(__wmemcmp_vx) | |
| 41 | .machine "z13" | |
| 42 | .machinemode "zarch_nohighgprs" | |
| 43 | ||
| 44 | # if !defined __s390x__ | |
| 45 | llgfr %r4,%r4 | |
| 46 | # endif /* !defined __s390x__ */ | |
| 47 | clgije %r4,0,.Lend_equal /* Nothing to do if n == 0. */ | |
| 48 | ||
| 49 | /* Check range of maxlen and convert to byte-count. */ | |
| 50 | # ifdef __s390x__ | |
| 51 | tmhh %r4,49152 /* Test bit 0 or 1 of maxlen. */ | |
| 52 | lghi %r1,-4 /* Max byte-count is 18446744073709551612. */ | |
| 53 | # else | |
| 54 | tmlh %r4,49152 /* Test bit 0 or 1 of maxlen. */ | |
| 55 | llilf %r1,4294967292 /* Max byte-count is 4294967292. */ | |
| 56 | # endif /* !__s390x__ */ | |
| 57 | sllg %r4,%r4,2 /* Convert character-count to byte-count. */ | |
| 58 | locgrne %r4,%r1 /* Use max byte-count, if bit 0/1 was one. */ | |
| 59 | ||
| 60 | lghi %r5,0 /* current_len = 0. */ | |
| 61 | ||
| 62 | clgijh %r4,16,.Lgt16 | |
| 63 | ||
| 64 | .Lremaining: | |
| 65 | aghi %r4,-1 /* vstl needs highest index. */ | |
| 66 | vll %v16,%r4,0(%r2) | |
| 67 | vll %v17,%r4,0(%r3) | |
| 68 | vfenef %v18,%v16,%v17 /* Compare not equal. */ | |
| 69 | vlgvb %r1,%v18,7 /* Load unequal index or 16 if not found. */ | |
| 70 | clrj %r1,%r4,12,.Lfound2 /* r1 <= r4 -> unequal within loaded | |
| 71 | bytes. */ | |
| 72 | ||
| 73 | .Lend_equal: | |
| 74 | lghi %r2,0 | |
| 75 | br %r14 | |
| 76 | ||
| 77 | .Lfound: | |
| 78 | /* vfenezf found an unequal element or zero. | |
| 79 | This instruction compares unsigned words, but wchar_t is signed. | |
| 80 | Thus we have to compare the found element again. */ | |
| 81 | vlgvb %r1,%v18,7 /* Extract not equal byte-index. */ | |
| 82 | .Lfound2: | |
| 83 | srl %r1,2 /* And convert it to character-index. */ | |
| 84 | vlgvf %r0,%v16,0(%r1) /* Load character-values. */ | |
| 85 | vlgvf %r1,%v17,0(%r1) | |
| 86 | cr %r0,%r1 | |
| 87 | je .Lend_equal | |
| 88 | lghi %r2,1 | |
| 89 | lghi %r1,-1 | |
| 90 | locgrl %r2,%r1 | |
| 91 | br %r14 | |
| 92 | ||
| 93 | .Lgt16: | |
| 94 | clgijh %r4,64,.Lpreloop64 | |
| 95 | ||
| 96 | .Lpreloop16: | |
| 97 | srlg %r1,%r4,4 /* Split into 16byte blocks */ | |
| 98 | .Lloop16: | |
| 99 | vl %v16,0(%r5,%r2) | |
| 100 | vl %v17,0(%r5,%r3) | |
| 101 | aghi %r5,16 | |
| 102 | vfenefs %v18,%v16,%v17 /* Compare not equal. */ | |
| 103 | jno .Lfound | |
| 104 | brctg %r1,.Lloop16 /* Loop until all blocks are processed. */ | |
| 105 | ||
| 106 | llgfr %r4,%r4 | |
| 107 | nilf %r4,15 /* Get remaining bytes */ | |
| 108 | locgre %r2,%r4 | |
| 109 | ber %r14 | |
| 110 | la %r2,0(%r5,%r2) | |
| 111 | la %r3,0(%r5,%r3) | |
| 112 | j .Lremaining | |
| 113 | ||
| 114 | .Lpreloop64: | |
| 115 | srlg %r1,%r4,6 /* Split into 64byte blocks */ | |
| 116 | .Lloop64: | |
| 117 | vl %v16,0(%r5,%r2) | |
| 118 | vl %v17,0(%r5,%r3) | |
| 119 | vfenefs %v18,%v16,%v17 /* Compare not equal. */ | |
| 120 | jno .Lfound | |
| 121 | ||
| 122 | vl %v16,16(%r5,%r2) | |
| 123 | vl %v17,16(%r5,%r3) | |
| 124 | vfenefs %v18,%v16,%v17 | |
| 125 | jno .Lfound | |
| 126 | ||
| 127 | vl %v16,32(%r5,%r2) | |
| 128 | vl %v17,32(%r5,%r3) | |
| 129 | vfenefs %v18,%v16,%v17 | |
| 130 | jno .Lfound | |
| 131 | ||
| 132 | vl %v16,48(%r5,%r2) | |
| 133 | vl %v17,48(%r5,%r3) | |
| 134 | aghi %r5,64 | |
| 135 | vfenefs %v18,%v16,%v17 | |
| 136 | jno .Lfound | |
| 137 | ||
| 138 | brctg %r1,.Lloop64 /* Loop until all blocks are processed. */ | |
| 139 | ||
| 140 | llgfr %r4,%r4 | |
| 141 | nilf %r4,63 /* Get remaining bytes */ | |
| 142 | locgre %r2,%r4 | |
| 143 | ber %r14 | |
| 144 | clgijh %r4,16,.Lpreloop16 | |
| 145 | la %r2,0(%r5,%r2) | |
| 146 | la %r3,0(%r5,%r3) | |
| 147 | j .Lremaining | |
| 148 | END(__wmemcmp_vx) | |
| 149 | #endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */ |