2011-01-12 18:59:09 +00:00
|
|
|
/* Optimized strcmp implementation for PowerPC476.
|
2024-01-01 18:12:26 +00:00
|
|
|
Copyright (C) 2010-2024 Free Software Foundation, Inc.
|
2011-01-12 18:59:09 +00:00
|
|
|
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
|
2012-03-09 23:56:38 +00:00
|
|
|
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/>. */
|
2011-01-12 18:59:09 +00:00
|
|
|
|
|
|
|
|
#include <sysdep.h>
|
|
|
|
|
|
|
|
|
|
/* strcmp
|
|
|
|
|
|
|
|
|
|
Register Use
|
|
|
|
|
r0:temp return equality
|
|
|
|
|
r3:source1 address, return equality
|
|
|
|
|
r4:source2 address
|
|
|
|
|
|
|
|
|
|
Implementation description
|
|
|
|
|
Check 2 words from src1 and src2. If unequal jump to end and
|
|
|
|
|
return src1 > src2 or src1 < src2.
|
|
|
|
|
If null check bytes before null and then jump to end and
|
|
|
|
|
return src1 > src2, src1 < src2 or src1 = src2.
|
|
|
|
|
If src1 = src2 and no null, repeat. */
|
|
|
|
|
|
2013-02-28 21:23:47 +00:00
|
|
|
EALIGN (strcmp,5,0)
|
2011-01-12 18:59:09 +00:00
|
|
|
neg r7,r3
|
|
|
|
|
clrlwi r7,r7,20
|
|
|
|
|
neg r8,r4
|
|
|
|
|
clrlwi r8,r8,20
|
|
|
|
|
srwi. r7,r7,5
|
|
|
|
|
beq L(byte_loop)
|
|
|
|
|
srwi. r8,r8,5
|
|
|
|
|
beq L(byte_loop)
|
|
|
|
|
cmplw r7,r8
|
|
|
|
|
mtctr r7
|
|
|
|
|
ble L(big_loop)
|
|
|
|
|
mtctr r8
|
|
|
|
|
|
|
|
|
|
L(big_loop):
|
|
|
|
|
lwz r5,0(r3)
|
|
|
|
|
lwz r6,4(r3)
|
|
|
|
|
lwz r8,0(r4)
|
|
|
|
|
lwz r9,4(r4)
|
|
|
|
|
dlmzb. r12,r5,r6
|
|
|
|
|
bne L(end_check)
|
|
|
|
|
cmplw r5,r8
|
|
|
|
|
bne L(st1)
|
|
|
|
|
cmplw r6,r9
|
|
|
|
|
bne L(st1)
|
|
|
|
|
lwz r5,8(r3)
|
|
|
|
|
lwz r6,12(r3)
|
|
|
|
|
lwz r8,8(r4)
|
|
|
|
|
lwz r9,12(r4)
|
|
|
|
|
dlmzb. r12,r5,r6
|
|
|
|
|
bne L(end_check)
|
|
|
|
|
cmplw r5,r8
|
|
|
|
|
bne L(st1)
|
|
|
|
|
cmplw r6,r9
|
|
|
|
|
bne L(st1)
|
|
|
|
|
lwz r5,16(r3)
|
|
|
|
|
lwz r6,20(r3)
|
|
|
|
|
lwz r8,16(r4)
|
|
|
|
|
lwz r9,20(r4)
|
|
|
|
|
dlmzb. r12,r5,r6
|
|
|
|
|
bne L(end_check)
|
|
|
|
|
cmplw r5,r8
|
|
|
|
|
bne L(st1)
|
|
|
|
|
cmplw r6,r9
|
|
|
|
|
bne L(st1)
|
|
|
|
|
lwz r5,24(r3)
|
|
|
|
|
lwz r6,28(r3)
|
|
|
|
|
addi r3,r3,0x20
|
|
|
|
|
lwz r8,24(r4)
|
|
|
|
|
lwz r9,28(r4)
|
|
|
|
|
addi r4,r4,0x20
|
|
|
|
|
dlmzb. r12,r5,r6
|
|
|
|
|
bne L(end_check)
|
|
|
|
|
cmplw r5,r8
|
|
|
|
|
bne L(st1)
|
|
|
|
|
cmplw r6,r9
|
|
|
|
|
bne L(st1)
|
|
|
|
|
bdnz L(big_loop)
|
|
|
|
|
b L(byte_loop)
|
|
|
|
|
|
|
|
|
|
L(end_check):
|
|
|
|
|
subfic r12,r12,4
|
|
|
|
|
blt L(end_check2)
|
|
|
|
|
rlwinm r12,r12,3,0,31
|
|
|
|
|
srw r5,r5,r12
|
|
|
|
|
srw r8,r8,r12
|
|
|
|
|
cmplw r5,r8
|
|
|
|
|
bne L(st1)
|
|
|
|
|
b L(end_strcmp)
|
|
|
|
|
|
|
|
|
|
L(end_check2):
|
|
|
|
|
addi r12,r12,4
|
|
|
|
|
cmplw r5,r8
|
|
|
|
|
rlwinm r12,r12,3,0,31
|
|
|
|
|
bne L(st1)
|
|
|
|
|
srw r6,r6,r12
|
|
|
|
|
srw r9,r9,r12
|
|
|
|
|
cmplw r6,r9
|
|
|
|
|
bne L(st1)
|
|
|
|
|
|
|
|
|
|
L(end_strcmp):
|
|
|
|
|
addi r3,r0,0
|
|
|
|
|
blr
|
|
|
|
|
|
|
|
|
|
L(st1):
|
|
|
|
|
mfcr r3
|
|
|
|
|
blr
|
|
|
|
|
|
|
|
|
|
L(byte_loop):
|
|
|
|
|
lbz r5,0(r3)
|
|
|
|
|
addi r3,r3,1
|
|
|
|
|
lbz r6,0(r4)
|
|
|
|
|
addi r4,r4,1
|
|
|
|
|
cmplw r5,r6
|
|
|
|
|
bne L(st1)
|
|
|
|
|
cmpwi r5,0
|
|
|
|
|
beq L(end_strcmp)
|
|
|
|
|
b L(byte_loop)
|
2013-02-28 21:23:47 +00:00
|
|
|
END (strcmp)
|
2011-01-12 18:59:09 +00:00
|
|
|
libc_hidden_builtin_def (strcmp)
|
