glibc/sysdeps/s390/memrchr-vx.S

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/* Vector optimized 32/64 bit S/390 version of memrchr.
Copyright (C) 2015-2023 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
Prefer https to http for gnu.org and fsf.org URLs Also, change sources.redhat.com to sourceware.org. This patch was automatically generated by running the following shell script, which uses GNU sed, and which avoids modifying files imported from upstream: sed -ri ' s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g ' \ $(find $(git ls-files) -prune -type f \ ! -name '*.po' \ ! -name 'ChangeLog*' \ ! -path COPYING ! -path COPYING.LIB \ ! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \ ! -path manual/texinfo.tex ! -path scripts/config.guess \ ! -path scripts/config.sub ! -path scripts/install-sh \ ! -path scripts/mkinstalldirs ! -path scripts/move-if-change \ ! -path INSTALL ! -path locale/programs/charmap-kw.h \ ! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \ ! '(' -name configure \ -execdir test -f configure.ac -o -f configure.in ';' ')' \ ! '(' -name preconfigure \ -execdir test -f preconfigure.ac ';' ')' \ -print) and then by running 'make dist-prepare' to regenerate files built from the altered files, and then executing the following to cleanup: chmod a+x sysdeps/unix/sysv/linux/riscv/configure # Omit irrelevant whitespace and comment-only changes, # perhaps from a slightly-different Autoconf version. git checkout -f \ sysdeps/csky/configure \ sysdeps/hppa/configure \ sysdeps/riscv/configure \ sysdeps/unix/sysv/linux/csky/configure # Omit changes that caused a pre-commit check to fail like this: # remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines git checkout -f \ sysdeps/powerpc/powerpc64/ppc-mcount.S \ sysdeps/unix/sysv/linux/s390/s390-64/syscall.S # Omit change that caused a pre-commit check to fail like this: # remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
2019-09-07 05:40:42 +00:00
<https://www.gnu.org/licenses/>. */
#include <ifunc-memrchr.h>
#if HAVE_MEMRCHR_Z13
# include "sysdep.h"
# include "asm-syntax.h"
.text
/* void *memrchr (const void *s, int c, size_t n)
Scans memory for character c backwards
and returns pointer to first c.
Register usage:
-r0=tmp
-r1=tmp
-r2=s
-r3=c
-r4=n
-r5=s in loop
-v16=part of s
-v17=index of found c
-v18=c replicated
-v20=permute pattern
*/
ENTRY(MEMRCHR_Z13)
.machine "z13"
.machinemode "zarch_nohighgprs"
# if !defined __s390x__
llgfr %r4,%r4
# endif /* !defined __s390x__ */
clgije %r4,0,.Lnot_found
vlvgb %v18,%r3,0 /* Generate vector which elements are all c.
If c > 255, c will be truncated. */
vrepb %v18,%v18,0
llcr %r3,%r3 /* char c_char = (char) c. */
/* check byte n - 1. */
llc %r0,-1(%r4,%r2)
slgfi %r4,1
clrje %r0,%r3,.Lfound_end
jh .Lnot_found /* Return NULL if n is now 0. */
larl %r1,.Lpermute_mask /* Load permute mask. */
vl %v20,0(%r1)
/* check byte n - 2. */
llc %r0,-1(%r4,%r2)
slgfi %r4,1
clrje %r0,%r3,.Lfound_end
jh .Lnot_found /* Return NULL if n is now 0. */
clgijhe %r4,64,.Lloop64 /* If n >= 64 -> loop64. */
.Llt64:
/* Process n < 64 bytes. */
clgijl %r4,16,.Llt16 /* Jump away if n < 16. */
aghi %r4,-16
vl %v16,0(%r4,%r2)
vfeebs %v17,%v16,%v18
jno .Lfound0
clgijl %r4,16,.Llt16
aghi %r4,-16
vl %v16,0(%r4,%r2)
vfeebs %v17,%v16,%v18
jno .Lfound0
clgijl %r4,16,.Llt16
aghi %r4,-16
vl %v16,0(%r4,%r2)
vfeebs %v17,%v16,%v18
jno .Lfound0
.Llt16:
clgfi %r4,0 /* if remaining bytes == 0, return NULL. */
locghie %r2,0
ber %r14
aghi %r4,-1 /* vll needs highest index. */
vll %v16,%r4,0(%r2) /* Load remaining bytes. */
/* Right-shift of v16 to mask bytes after highest index. */
lhi %r0,15
slr %r0,%r4 /* Compute byte count for vector shift right. */
sll %r0,3 /* Convert to bit count. */
vlvgb %v17,%r0,7
vsrlb %v16,%v16,%v17 /* Vector shift right by byte by number of bytes
specified in bits 1-4 of byte 7 in v17. */
j .Lfound_permute
.Lfound48:
aghi %r4,16
.Lfound32:
aghi %r4,16
.Lfound16:
aghi %r4,16
.Lfound0:
la %r2,0(%r4,%r2) /* Set pointer to start of v16. */
lghi %r4,15 /* Set highest index in v16 to last index. */
.Lfound_permute:
/* Search for a c in v16 in reversed byte order. v16 contains %r4 + 1
bytes. If v16 was not fully loaded, the bytes are already
right shifted, so that the bytes in v16 can simply be reversed. */
vperm %v16,%v16,%v16,%v20 /* Permute v16 to reversed order. */
vfeeb %v16,%v16,%v18 /* Find c in reversed v16. */
vlgvb %r1,%v16,7 /* Index of c or 16 if not found. */
/* Return NULL if there is no c in loaded bytes. */
clrjh %r1,%r4,.Lnot_found
slgr %r4,%r1
.Lfound_end:
la %r2,0(%r4,%r2) /* Return pointer to c. */
br %r14
.Lnot_found:
lghi %r2,0
br %r14
.Lpermute_mask:
.byte 0x0F,0x0E,0x0D,0x0C,0x0B,0x0A,0x09,0x08
.byte 0x07,0x06,0x05,0x04,0x03,0x02,0x01,0x00
.Lloop64:
aghi %r4,-64
vl %v16,48(%r4,%r2) /* Load 16bytes of memory area. */
vfeebs %v17,%v16,%v18 /* Find c. */
jno .Lfound48 /* Jump away if c was found. */
vl %v16,32(%r4,%r2)
vfeebs %v17,%v16,%v18
jno .Lfound32
vl %v16,16(%r4,%r2)
vfeebs %v17,%v16,%v18
jno .Lfound16
vl %v16,0(%r4,%r2)
vfeebs %v17,%v16,%v18
jno .Lfound0
clgijhe %r4,64,.Lloop64 /* If n >= 64 -> loop64. */
j .Llt64
END(MEMRCHR_Z13)
# if ! HAVE_MEMRCHR_IFUNC
libc_hidden_def (__memrchr)
strong_alias (MEMRCHR_Z13, __memrchr)
weak_alias (__memrchr, memrchr)
# endif
#endif /* HAVE_MEMRCHR_Z13 */