| /* Vector Optimized 32/64 bit S/390 version of wmemcmp. |
| Copyright (C) 2015-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) |
| |
| # include "sysdep.h" |
| # include "asm-syntax.h" |
| |
| .text |
| |
| /* int wmemcmp (const wchar_t *s1, const wchar_t *s2, size_t n) |
| Compare at most n characters of two wchar_t-arrays. |
| |
| Register usage: |
| -r0=tmp |
| -r1=number of blocks |
| -r2=s1 |
| -r3=s2 |
| -r4=n |
| -r5=current_len |
| -v16=part of s1 |
| -v17=part of s2 |
| -v18=index of unequal |
| */ |
| ENTRY(__wmemcmp_vx) |
| .machine "z13" |
| .machinemode "zarch_nohighgprs" |
| |
| # if !defined __s390x__ |
| llgfr %r4,%r4 |
| # endif /* !defined __s390x__ */ |
| clgije %r4,0,.Lend_equal /* Nothing to do if n == 0. */ |
| |
| /* Check range of maxlen and convert to byte-count. */ |
| # ifdef __s390x__ |
| tmhh %r4,49152 /* Test bit 0 or 1 of maxlen. */ |
| lghi %r1,-4 /* Max byte-count is 18446744073709551612. */ |
| # else |
| tmlh %r4,49152 /* Test bit 0 or 1 of maxlen. */ |
| llilf %r1,4294967292 /* Max byte-count is 4294967292. */ |
| # endif /* !__s390x__ */ |
| sllg %r4,%r4,2 /* Convert character-count to byte-count. */ |
| locgrne %r4,%r1 /* Use max byte-count, if bit 0/1 was one. */ |
| |
| lghi %r5,0 /* current_len = 0. */ |
| |
| clgijh %r4,16,.Lgt16 |
| |
| .Lremaining: |
| aghi %r4,-1 /* vstl needs highest index. */ |
| vll %v16,%r4,0(%r2) |
| vll %v17,%r4,0(%r3) |
| vfenef %v18,%v16,%v17 /* Compare not equal. */ |
| vlgvb %r1,%v18,7 /* Load unequal index or 16 if not found. */ |
| clrj %r1,%r4,12,.Lfound2 /* r1 <= r4 -> unequal within loaded |
| bytes. */ |
| |
| .Lend_equal: |
| lghi %r2,0 |
| br %r14 |
| |
| .Lfound: |
| /* vfenezf found an unequal element or zero. |
| This instruction compares unsigned words, but wchar_t is signed. |
| Thus we have to compare the found element again. */ |
| vlgvb %r1,%v18,7 /* Extract not equal byte-index. */ |
| .Lfound2: |
| srl %r1,2 /* And convert it to character-index. */ |
| vlgvf %r0,%v16,0(%r1) /* Load character-values. */ |
| vlgvf %r1,%v17,0(%r1) |
| cr %r0,%r1 |
| je .Lend_equal |
| lghi %r2,1 |
| lghi %r1,-1 |
| locgrl %r2,%r1 |
| br %r14 |
| |
| .Lgt16: |
| clgijh %r4,64,.Lpreloop64 |
| |
| .Lpreloop16: |
| srlg %r1,%r4,4 /* Split into 16byte blocks */ |
| .Lloop16: |
| vl %v16,0(%r5,%r2) |
| vl %v17,0(%r5,%r3) |
| aghi %r5,16 |
| vfenefs %v18,%v16,%v17 /* Compare not equal. */ |
| jno .Lfound |
| brctg %r1,.Lloop16 /* Loop until all blocks are processed. */ |
| |
| llgfr %r4,%r4 |
| nilf %r4,15 /* Get remaining bytes */ |
| locgre %r2,%r4 |
| ber %r14 |
| la %r2,0(%r5,%r2) |
| la %r3,0(%r5,%r3) |
| j .Lremaining |
| |
| .Lpreloop64: |
| srlg %r1,%r4,6 /* Split into 64byte blocks */ |
| .Lloop64: |
| vl %v16,0(%r5,%r2) |
| vl %v17,0(%r5,%r3) |
| vfenefs %v18,%v16,%v17 /* Compare not equal. */ |
| jno .Lfound |
| |
| vl %v16,16(%r5,%r2) |
| vl %v17,16(%r5,%r3) |
| vfenefs %v18,%v16,%v17 |
| jno .Lfound |
| |
| vl %v16,32(%r5,%r2) |
| vl %v17,32(%r5,%r3) |
| vfenefs %v18,%v16,%v17 |
| jno .Lfound |
| |
| vl %v16,48(%r5,%r2) |
| vl %v17,48(%r5,%r3) |
| aghi %r5,64 |
| vfenefs %v18,%v16,%v17 |
| jno .Lfound |
| |
| brctg %r1,.Lloop64 /* Loop until all blocks are processed. */ |
| |
| llgfr %r4,%r4 |
| nilf %r4,63 /* Get remaining bytes */ |
| locgre %r2,%r4 |
| ber %r14 |
| clgijh %r4,16,.Lpreloop16 |
| la %r2,0(%r5,%r2) |
| la %r3,0(%r5,%r3) |
| j .Lremaining |
| END(__wmemcmp_vx) |
| #endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */ |
