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Diffstat (limited to 'sysdeps/s390/multiarch/wmemcmp-vx.S')
| -rw-r--r-- | sysdeps/s390/multiarch/wmemcmp-vx.S | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/sysdeps/s390/multiarch/wmemcmp-vx.S b/sysdeps/s390/multiarch/wmemcmp-vx.S new file mode 100644 index 0000000000..eabfd2b77d --- /dev/null +++ b/sysdeps/s390/multiarch/wmemcmp-vx.S @@ -0,0 +1,149 @@ +/* Vector Optimized 32/64 bit S/390 version of wmemcmp. + Copyright (C) 2015 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) */ |