mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-15 04:20:28 +08:00
5a82c74822
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
182 lines
4.4 KiB
ArmAsm
182 lines
4.4 KiB
ArmAsm
/* Optimized strcmp implementation for PowerPC32.
|
|
Copyright (C) 2003-2019 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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <sysdep.h>
|
|
|
|
/* See strlen.s for comments on how the end-of-string testing works. */
|
|
|
|
/* int [r3] strncmp (const char *s1 [r3], const char *s2 [r4], size_t size [r5]) */
|
|
|
|
EALIGN (strncmp, 4, 0)
|
|
|
|
#define rTMP2 r0
|
|
#define rRTN r3
|
|
#define rSTR1 r3 /* first string arg */
|
|
#define rSTR2 r4 /* second string arg */
|
|
#define rN r5 /* max string length */
|
|
#define rWORD1 r6 /* current word in s1 */
|
|
#define rWORD2 r7 /* current word in s2 */
|
|
#define rFEFE r8 /* constant 0xfefefeff (-0x01010101) */
|
|
#define r7F7F r9 /* constant 0x7f7f7f7f */
|
|
#define rNEG r10 /* ~(word in s1 | 0x7f7f7f7f) */
|
|
#define rBITDIF r11 /* bits that differ in s1 & s2 words */
|
|
#define rTMP r12
|
|
|
|
dcbt 0,rSTR1
|
|
or rTMP, rSTR2, rSTR1
|
|
lis r7F7F, 0x7f7f
|
|
dcbt 0,rSTR2
|
|
clrlwi. rTMP, rTMP, 30
|
|
cmplwi cr1, rN, 0
|
|
lis rFEFE, -0x101
|
|
bne L(unaligned)
|
|
/* We are word aligned so set up for two loops. first a word
|
|
loop, then fall into the byte loop if any residual. */
|
|
srwi. rTMP, rN, 2
|
|
clrlwi rN, rN, 30
|
|
addi rFEFE, rFEFE, -0x101
|
|
addi r7F7F, r7F7F, 0x7f7f
|
|
cmplwi cr1, rN, 0
|
|
beq L(unaligned)
|
|
|
|
mtctr rTMP /* Power4 wants mtctr 1st in dispatch group. */
|
|
lwz rWORD1, 0(rSTR1)
|
|
lwz rWORD2, 0(rSTR2)
|
|
b L(g1)
|
|
|
|
L(g0):
|
|
lwzu rWORD1, 4(rSTR1)
|
|
bne- cr1, L(different)
|
|
lwzu rWORD2, 4(rSTR2)
|
|
L(g1): add rTMP, rFEFE, rWORD1
|
|
nor rNEG, r7F7F, rWORD1
|
|
bdz L(tail)
|
|
and. rTMP, rTMP, rNEG
|
|
cmpw cr1, rWORD1, rWORD2
|
|
beq+ L(g0)
|
|
|
|
/* OK. We've hit the end of the string. We need to be careful that
|
|
we don't compare two strings as different because of gunk beyond
|
|
the end of the strings... */
|
|
|
|
#ifdef __LITTLE_ENDIAN__
|
|
L(endstring):
|
|
slwi rTMP, rTMP, 1
|
|
addi rTMP2, rTMP, -1
|
|
andc rTMP2, rTMP2, rTMP
|
|
and rWORD2, rWORD2, rTMP2 /* Mask off gunk. */
|
|
and rWORD1, rWORD1, rTMP2
|
|
rlwinm rTMP2, rWORD2, 8, 0xffffffff /* Byte reverse word. */
|
|
rlwinm rTMP, rWORD1, 8, 0xffffffff
|
|
rlwimi rTMP2, rWORD2, 24, 0, 7
|
|
rlwimi rTMP, rWORD1, 24, 0, 7
|
|
rlwimi rTMP2, rWORD2, 24, 16, 23
|
|
rlwimi rTMP, rWORD1, 24, 16, 23
|
|
xor. rBITDIF, rTMP, rTMP2
|
|
sub rRTN, rTMP, rTMP2
|
|
bgelr+
|
|
ori rRTN, rTMP2, 1
|
|
blr
|
|
|
|
L(different):
|
|
lwz rWORD1, -4(rSTR1)
|
|
rlwinm rTMP2, rWORD2, 8, 0xffffffff /* Byte reverse word. */
|
|
rlwinm rTMP, rWORD1, 8, 0xffffffff
|
|
rlwimi rTMP2, rWORD2, 24, 0, 7
|
|
rlwimi rTMP, rWORD1, 24, 0, 7
|
|
rlwimi rTMP2, rWORD2, 24, 16, 23
|
|
rlwimi rTMP, rWORD1, 24, 16, 23
|
|
xor. rBITDIF, rTMP, rTMP2
|
|
sub rRTN, rTMP, rTMP2
|
|
bgelr+
|
|
ori rRTN, rTMP2, 1
|
|
blr
|
|
|
|
#else
|
|
L(endstring):
|
|
and rTMP, r7F7F, rWORD1
|
|
beq cr1, L(equal)
|
|
add rTMP, rTMP, r7F7F
|
|
xor. rBITDIF, rWORD1, rWORD2
|
|
andc rNEG, rNEG, rTMP
|
|
blt- L(highbit)
|
|
cntlzw rBITDIF, rBITDIF
|
|
cntlzw rNEG, rNEG
|
|
addi rNEG, rNEG, 7
|
|
cmpw cr1, rNEG, rBITDIF
|
|
sub rRTN, rWORD1, rWORD2
|
|
bgelr+ cr1
|
|
L(equal):
|
|
li rRTN, 0
|
|
blr
|
|
|
|
L(different):
|
|
lwz rWORD1, -4(rSTR1)
|
|
xor. rBITDIF, rWORD1, rWORD2
|
|
sub rRTN, rWORD1, rWORD2
|
|
bgelr+
|
|
L(highbit):
|
|
ori rRTN, rWORD2, 1
|
|
blr
|
|
#endif
|
|
|
|
/* Oh well. In this case, we just do a byte-by-byte comparison. */
|
|
.align 4
|
|
L(tail):
|
|
and. rTMP, rTMP, rNEG
|
|
cmpw cr1, rWORD1, rWORD2
|
|
bne- L(endstring)
|
|
addi rSTR1, rSTR1, 4
|
|
bne- cr1, L(different)
|
|
addi rSTR2, rSTR2, 4
|
|
cmplwi cr1, rN, 0
|
|
L(unaligned):
|
|
mtctr rN /* Power4 wants mtctr 1st in dispatch group */
|
|
bgt cr1, L(uz)
|
|
L(ux):
|
|
li rRTN, 0
|
|
blr
|
|
.align 4
|
|
L(uz):
|
|
lbz rWORD1, 0(rSTR1)
|
|
lbz rWORD2, 0(rSTR2)
|
|
nop
|
|
b L(u1)
|
|
L(u0):
|
|
lbzu rWORD2, 1(rSTR2)
|
|
L(u1):
|
|
bdz L(u3)
|
|
cmpwi cr1, rWORD1, 0
|
|
cmpw rWORD1, rWORD2
|
|
beq- cr1, L(u3)
|
|
lbzu rWORD1, 1(rSTR1)
|
|
bne- L(u2)
|
|
lbzu rWORD2, 1(rSTR2)
|
|
bdz L(u3)
|
|
cmpwi cr1, rWORD1, 0
|
|
cmpw rWORD1, rWORD2
|
|
bne- L(u3)
|
|
lbzu rWORD1, 1(rSTR1)
|
|
bne+ cr1, L(u0)
|
|
|
|
L(u2): lbzu rWORD1, -1(rSTR1)
|
|
L(u3): sub rRTN, rWORD1, rWORD2
|
|
blr
|
|
END (strncmp)
|
|
libc_hidden_builtin_def (strncmp)
|