| xf.li | bfc6e71 | 2025-02-07 01:54:34 -0800 | [diff] [blame^] | 1 | /* Vector optimized 32/64 bit S/390 version of wcscmp. |
| 2 | Copyright (C) 2015-2016 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, 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 wcscmp (const wchar_t *s1, const wchar_t *s2) |
| 27 | Compare two strings |
| 28 | |
| 29 | Register usage: |
| 30 | -r1=loaded byte count s1 |
| 31 | -r2=s1 |
| 32 | -r3=s2 |
| 33 | -r4=loaded byte coutn s2, tmp |
| 34 | -r5=current_len |
| 35 | -v16=part of s1 |
| 36 | -v17=part of s2 |
| 37 | -v18=index of unequal |
| 38 | */ |
| 39 | ENTRY(__wcscmp_vx) |
| 40 | .machine "z13" |
| 41 | .machinemode "zarch_nohighgprs" |
| 42 | |
| 43 | lghi %r5,0 /* current_len = 0. */ |
| 44 | |
| 45 | .Lloop: |
| 46 | vlbb %v16,0(%r5,%r2),6 /* Load s1 to block boundary. */ |
| 47 | vlbb %v17,0(%r5,%r3),6 /* Load s2 to block boundary. */ |
| 48 | lcbb %r1,0(%r5,%r2),6 /* Get loaded byte count of s1. */ |
| 49 | jo .Llt16_1 /* Jump away if vr is not fully loaded. */ |
| 50 | lcbb %r4,0(%r5,%r3),6 |
| 51 | jo .Llt16_2 /* Jump away if vr is not fully loaded. */ |
| 52 | /* Both vrs are fully loaded. */ |
| 53 | aghi %r5,16 |
| 54 | vfenezfs %v18,%v16,%v17 /* Compare not equal with zero search. */ |
| 55 | jno .Lfound |
| 56 | |
| 57 | vlbb %v16,0(%r5,%r2),6 |
| 58 | vlbb %v17,0(%r5,%r3),6 |
| 59 | lcbb %r1,0(%r5,%r2),6 |
| 60 | jo .Llt16_1 |
| 61 | lcbb %r4,0(%r5,%r3),6 |
| 62 | jo .Llt16_2 |
| 63 | aghi %r5,16 |
| 64 | vfenezfs %v18,%v16,%v17 |
| 65 | jno .Lfound |
| 66 | |
| 67 | vlbb %v16,0(%r5,%r2),6 |
| 68 | vlbb %v17,0(%r5,%r3),6 |
| 69 | lcbb %r1,0(%r5,%r2),6 |
| 70 | jo .Llt16_1 |
| 71 | lcbb %r4,0(%r5,%r3),6 |
| 72 | jo .Llt16_2 |
| 73 | aghi %r5,16 |
| 74 | vfenezfs %v18,%v16,%v17 |
| 75 | jno .Lfound |
| 76 | |
| 77 | vlbb %v16,0(%r5,%r2),6 |
| 78 | vlbb %v17,0(%r5,%r3),6 |
| 79 | lcbb %r1,0(%r5,%r2),6 |
| 80 | jo .Llt16_1 |
| 81 | lcbb %r4,0(%r5,%r3),6 |
| 82 | jo .Llt16_2 |
| 83 | aghi %r5,16 |
| 84 | vfenezfs %v18,%v16,%v17 |
| 85 | jno .Lfound |
| 86 | j .Lloop |
| 87 | |
| 88 | .Lcmp_one_char: |
| 89 | /* At least one of both strings is not 4-byte aligned |
| 90 | and there is no full character before next block-boundary. |
| 91 | Compare one character to get over the boundary and |
| 92 | proceed with normal loop! */ |
| 93 | vlef %v16,0(%r5,%r2),0 /* Load one character. */ |
| 94 | vlef %v17,0(%r5,%r3),0 |
| 95 | lghi %r1,4 /* Loaded byte count is 4. */ |
| 96 | j .Llt_cmp /* Proceed with comparision. */ |
| 97 | |
| 98 | .Llt16_1: |
| 99 | lcbb %r4,0(%r5,%r3),6 /* Get loaded byte count of s2. */ |
| 100 | .Llt16_2: |
| 101 | clr %r1,%r4 |
| 102 | locrh %r1,%r4 /* Get minimum of bytes loaded in s1/2. */ |
| 103 | nill %r1,65532 /* Align bytes loaded to full characters. */ |
| 104 | jz .Lcmp_one_char /* Jump away if no full char is available. */ |
| 105 | .Llt_cmp: |
| 106 | algfr %r5,%r1 /* Add smallest loaded bytes to current_len. */ |
| 107 | vfenezfs %v18,%v16,%v17 /* Compare not equal with zero search. */ |
| 108 | vlgvb %r4,%v18,7 /* Get not equal index or 16 if all equal. */ |
| 109 | clrjl %r4,%r1,.Lfound /* Jump away if miscompare is within loaded |
| 110 | bytes. */ |
| 111 | j .Lloop |
| 112 | |
| 113 | .Lfound: |
| 114 | /* vfenezf found an unequal element or zero. |
| 115 | This instruction compares unsigned words, but wchar_t is signed. |
| 116 | Thus we have to compare the found element again. */ |
| 117 | vlgvb %r4,%v18,7 /* Extract not equal byte-index, */ |
| 118 | srl %r4,2 /* Convert it to character-index. */ |
| 119 | vlgvf %r3,%v16,0(%r4) /* Load character-values. */ |
| 120 | vlgvf %r4,%v17,0(%r4) |
| 121 | cr %r3,%r4 |
| 122 | je .Lend_equal |
| 123 | lghi %r2,1 |
| 124 | lghi %r1,-1 |
| 125 | locgrl %r2,%r1 |
| 126 | br %r14 |
| 127 | .Lend_equal: |
| 128 | lghi %r2,0 |
| 129 | br %r14 |
| 130 | END(__wcscmp_vx) |
| 131 | #endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */ |