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/* Vector optimized 32/64 bit S/390 version of rawmemchr.
Copyright (C) 2015-2017 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
/* void *rawmemchr (const void *s, int c)
Scans memory for character c
and returns pointer to first c.
Register usage:
-r1=tmp
-r2=s
-r3=c
-r4=tmp
-r5=current_len
-v16=part of s
-v17=index of unequal
-v18=c replicated
*/
ENTRY(__rawmemchr_vx)
.machine "z13"
.machinemode "zarch_nohighgprs"
vlbb %v16,0(%r2),6 /* Load s until next 4k-byte boundary. */
lcbb %r1,0(%r2),6 /* Get bytes to 4k-byte boundary or 16. */
vlvgb %v18,%r3,0 /* Generate vector which elements are all c.
If c > 255, c will be truncated. */
vrepb %v18,%v18,0
vfeeb %v17,%v16,%v18 /* Vector find element equal. */
vlgvb %r5,%v17,7 /* Load byte index of character or zero. */
clrjl %r5,%r1,.Lend_found /* If found c is in loaded bytes, end. */
/* Align s to 16 byte. */
risbgn %r1,%r2,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15. */
lghi %r5,16
slr %r5,%r1 /* Compute bytes to 16bytes boundary. */
/* Find c in a 16byte aligned loop. */
.Lloop:
vl %v16,0(%r5,%r2) /* Load s. */
vfeebs %v17,%v16,%v18 /* Vector find element equal. */
jno .Lcharacter /* Jump away if element found. */
vl %v16,16(%r5,%r2)
vfeebs %v17,%v16,%v18
jno .Lcharacter16
vl %v16,32(%r5,%r2)
vfeebs %v17,%v16,%v18
jno .Lcharacter32
vl %v16,48(%r5,%r2)
vfeebs %v17,%v16,%v18
jno .Lcharacter48
aghi %r5,64
j .Lloop /* No character found -> loop. */
/* Found character. */
.Lcharacter48:
aghi %r5,16
.Lcharacter32:
aghi %r5,16
.Lcharacter16:
aghi %r5,16
.Lcharacter:
vlgvb %r1,%v17,7 /* Load byte index of character. */
algr %r5,%r1
.Lend_found:
la %r2,0(%r5,%r2) /* Return pointer to character. */
br %r14
END(__rawmemchr_vx)
#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
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