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/* Vector optimized 32/64 bit S/390 version of wcschrnul.
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
/* wchar_t* wcschrnul (const wchar_t *s, wchar_t c)
Returns pointer to first c or to \0 if c not found.
Register usage:
-r1=tmp
-r2=s and return pointer
-r3=c
-r4=tmp
-r5=current_len
-v16=part of s
-v18=vector with c replicated in every byte
*/
ENTRY(__wcschrnul_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. */
tmll %r2,3 /* Test if s is 4-byte aligned? */
jne .Lfallback /* And use common-code variant if not. */
lghi %r5,0 /* current_len = 0. */
vlvgf %v18,%r3,0 /* Generate vector which elements are all c. */
vrepf %v18,%v18,0
vfeezfs %v16,%v16,%v18 /* Find element equal with zero search. */
vlgvb %r4,%v16,7 /* Load byte index of character or zero. */
clrjl %r4,%r1,.Lfound /* Return if c/zero is in loaded bytes. */
/* Align s to 16 byte. */
risbgn %r4,%r2,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15. */
lghi %r5,16 /* current_len = 16. */
slr %r5,%r4 /* Compute bytes to 16bytes boundary. */
/* Find c/zero in 16byte aligned loop */
.Lloop:
vl %v16,0(%r5,%r2) /* Load s. */
vfeezfs %v16,%v16,%v18 /* Find element equal with zero search. */
jno .Lfound /* Found c/zero (cc=0|1|2). */
vl %v16,16(%r5,%r2)
vfeezfs %v16,%v16,%v18
jno .Lfound16
vl %v16,32(%r5,%r2)
vfeezfs %v16,%v16,%v18
jno .Lfound32
vl %v16,48(%r5,%r2)
vfeezfs %v16,%v16,%v18
jno .Lfound48
aghi %r5,64
j .Lloop /* No character and no zero -> loop. */
/* Found character or zero */
.Lfound48:
aghi %r5,16
.Lfound32:
aghi %r5,16
.Lfound16:
aghi %r5,16
.Lfound:
vlgvb %r1,%v16,7 /* Load byte index of character. */
algr %r5,%r1
la %r2,0(%r5,%r2) /* Return pointer to character. */
.Lend:
br %r14
.Lfallback:
jg __wcschrnul_c
END(__wcschrnul_vx)
#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
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