glibc/sysdeps/s390/strchr-vx.S
Stefan Liebler 32f12653d4 S390: Refactor strchr ifunc handling.
The ifunc handling for strchr is adjusted in order to omit ifunc
variants if those will never be used as the minimum architecture level
already supports newer CPUs by default.
Glibc internal calls will then also use the "newer" ifunc variant.

ChangeLog:

	* sysdeps/s390/multiarch/Makefile
	(sysdep_routines): Remove strchr variants.
	* sysdeps/s390/Makefile (sysdep_routines): Add strchr variants.
	* sysdeps/s390/multiarch/ifunc-impl-list.c
	(__libc_ifunc_impl_list): Refactor ifunc handling for strchr.
	* sysdeps/s390/multiarch/strchr-c.c: Move to ...
	* sysdeps/s390/strchr-c.c: ... here and adjust ifunc handling.
	* sysdeps/s390/multiarch/strchr-vx.S: Move to ...
	* sysdeps/s390/strchr-vx.S: ... here and adjust ifunc handling.
	* sysdeps/s390/multiarch/strchr.c: Move to ...
	* sysdeps/s390/strchr.c: ... here and adjust ifunc handling.
	* sysdeps/s390/ifunc-strchr.h: New file.
2018-12-18 13:57:14 +01:00

113 lines
3.1 KiB
ArmAsm

/* Vector optimized 32/64 bit S/390 version of strchr.
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/>. */
#include <ifunc-strchr.h>
#if HAVE_STRCHR_Z13
# include "sysdep.h"
# include "asm-syntax.h"
.text
/* char *strchr (const char *s, int c)
Locate character in string.
Register usage:
-r1=tmp
-r2=s
-r3=c
-r4=tmp
-r5=current_len
-v16=part of s
-v17=index of unequal
-v18=replicated c
*/
ENTRY(STRCHR_Z13)
.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. */
lghi %r5,0 /* current_len = 0. */
vlvgb %v18,%r3,0 /* Generate vector which elements are all c.
If c > 255, c will be truncated. */
vrepb %v18,%v18,0
vfeezbs %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 16 byte aligned loop */
.Lloop:
vl %v16,0(%r5,%r2) /* Load s. */
vfeezbs %v16,%v16,%v18 /* Find element equal with zero search. */
jno .Lfound /* Found c/zero (cc=0|1|2). */
vl %v16,16(%r5,%r2)
vfeezbs %v16,%v16,%v18
jno .Lfound16
vl %v16,32(%r5,%r2)
vfeezbs %v16,%v16,%v18
jno .Lfound32
vl %v16,48(%r5,%r2)
vfeezbs %v16,%v16,%v18
jno .Lfound48
aghi %r5,64
j .Lloop /* No character and no zero -> loop. */
.Lfound48:
la %r5,16(%r5) /* Use la since aghi would clobber cc. */
.Lfound32:
la %r5,16(%r5)
.Lfound16:
la %r5,16(%r5)
.Lfound:
je .Lzero /* Found zero, but no c before that zero. */
.Lcharacter:
vlgvb %r4,%v16,7 /* Load byte index of character. */
algr %r5,%r4
la %r2,0(%r5,%r2) /* Return pointer to character. */
br %r14
.Lzero:
llgcr %r3,%r3 /* char c_char = (char) c. */
clije %r3,0,.Lcharacter /* Found zero and c is zero. */
lghi %r2,0 /* Return null if character not found. */
br %r14
END(STRCHR_Z13)
# if ! HAVE_STRCHR_IFUNC
strong_alias (STRCHR_Z13, strchr)
weak_alias (strchr, index)
# endif
# if ! HAVE_STRCHR_C && defined SHARED && IS_IN (libc)
strong_alias (STRCHR_Z13, __GI_strchr)
# endif
#endif /* HAVE_STRCHR_Z13 */