glibc/sysdeps/alpha/strchr.S

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/* Copyright (C) 1996-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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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.
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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
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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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
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<https://www.gnu.org/licenses/>. */
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/* Return the address of a given character within a null-terminated
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string, or null if it is not found.
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This is generally scheduled for the EV5 (got to look out for my own
interests :-), but with EV4 needs in mind. There *should* be no more
stalls for the EV4 than there are for the EV5.
*/
#include <sysdep.h>
.set noreorder
.set noat
ENTRY(strchr)
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#ifdef PROF
ldgp gp, 0(pv)
lda AT, _mcount
jsr AT, (AT), _mcount
.prologue 1
#else
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.prologue 0
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#endif
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zapnot a1, 1, a1 # e0 : zero extend the search character
ldq_u t0, 0(a0) # .. e1 : load first quadword
sll a1, 8, t5 # e0 : replicate the search character
andnot a0, 7, v0 # .. e1 : align our loop pointer
or t5, a1, a1 # e0 :
lda t4, -1 # .. e1 : build garbage mask
sll a1, 16, t5 # e0 :
cmpbge zero, t0, t2 # .. e1 : bits set iff byte == zero
mskqh t4, a0, t4 # e0 :
or t5, a1, a1 # .. e1 :
sll a1, 32, t5 # e0 :
cmpbge zero, t4, t4 # .. e1 : bits set iff byte is garbage
or t5, a1, a1 # e0 :
xor t0, a1, t1 # .. e1 : make bytes == c zero
cmpbge zero, t1, t3 # e0 : bits set iff byte == c
or t2, t3, t0 # e1 : bits set iff char match or zero match
andnot t0, t4, t0 # e0 : clear garbage bits
bne t0, $found # .. e1 (zdb)
$loop: ldq t0, 8(v0) # e0 :
addq v0, 8, v0 # .. e1 :
nop # e0 :
xor t0, a1, t1 # .. e1 (ev5 data stall)
cmpbge zero, t0, t2 # e0 : bits set iff byte == 0
cmpbge zero, t1, t3 # .. e1 : bits set iff byte == c
or t2, t3, t0 # e0 :
beq t0, $loop # .. e1 (zdb)
$found: negq t0, t1 # e0 : clear all but least set bit
and t0, t1, t0 # e1 (stall)
and t0, t3, t1 # e0 : bit set iff byte was the char
beq t1, $retnull # .. e1 (zdb)
and t0, 0xf0, t2 # e0 : binary search for that set bit
and t0, 0xcc, t3 # .. e1 :
and t0, 0xaa, t4 # e0 :
cmovne t2, 4, t2 # .. e1 :
cmovne t3, 2, t3 # e0 :
cmovne t4, 1, t4 # .. e1 :
addq t2, t3, t2 # e0 :
addq v0, t4, v0 # .. e1 :
addq v0, t2, v0 # e0 :
ret # .. e1 :
$retnull:
mov zero, v0 # e0 :
ret # .. e1 :
END(strchr)
weak_alias (strchr, index)
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libc_hidden_builtin_def (strchr)