mirror of
https://sourceware.org/git/glibc.git
synced 2025-11-06 19:29:35 +03:00
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
226 lines
6.1 KiB
ArmAsm
226 lines
6.1 KiB
ArmAsm
/* Optimized strchr implementation for PowerPC32/POWER7 using cmpb insn.
|
|
Copyright (C) 2010-2019 Free Software Foundation, Inc.
|
|
Contributed by Luis Machado <luisgpm@br.ibm.com>.
|
|
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>
|
|
|
|
/* int [r3] strchr (char *s [r3], int c [r4]) */
|
|
.machine power7
|
|
ENTRY (strchr)
|
|
CALL_MCOUNT
|
|
dcbt 0,r3
|
|
clrrwi r8,r3,2 /* Align the address to word boundary. */
|
|
cmpwi cr7,r4,0
|
|
lwz r12,0(r8) /* Load word from memory. */
|
|
li r0,0 /* Word with null chars to use
|
|
with cmpb. */
|
|
|
|
rlwinm r6,r3,3,27,28 /* Calculate padding. */
|
|
|
|
beq cr7,L(null_match)
|
|
|
|
/* Replicate byte to word. */
|
|
insrwi r4,r4,8,16
|
|
insrwi r4,r4,16,0
|
|
|
|
/* Now r4 has a word of c bytes and r0 has
|
|
a word of null bytes. */
|
|
|
|
cmpb r10,r12,r4 /* Compare each byte against c byte. */
|
|
cmpb r11,r12,r0 /* Compare each byte against null byte. */
|
|
|
|
/* Move the words left and right to discard the bits that are
|
|
not part of the string and to bring them back as zeros. */
|
|
#ifdef __LITTLE_ENDIAN__
|
|
srw r10,r10,r6
|
|
srw r11,r11,r6
|
|
slw r10,r10,r6
|
|
slw r11,r11,r6
|
|
#else
|
|
slw r10,r10,r6
|
|
slw r11,r11,r6
|
|
srw r10,r10,r6
|
|
srw r11,r11,r6
|
|
#endif
|
|
or r5,r10,r11 /* OR the results to speed things up. */
|
|
cmpwi cr7,r5,0 /* If r5 == 0, no c or null bytes
|
|
have been found. */
|
|
bne cr7,L(done)
|
|
|
|
mtcrf 0x01,r8
|
|
|
|
/* Are we now aligned to a doubleword boundary? If so, skip to
|
|
the main loop. Otherwise, go through the alignment code. */
|
|
|
|
bt 29,L(loop)
|
|
|
|
/* Handle WORD2 of pair. */
|
|
lwzu r12,4(r8)
|
|
cmpb r10,r12,r4
|
|
cmpb r11,r12,r0
|
|
or r5,r10,r11
|
|
cmpwi cr7,r5,0
|
|
bne cr7,L(done)
|
|
b L(loop) /* We branch here (rather than falling through)
|
|
to skip the nops due to heavy alignment
|
|
of the loop below. */
|
|
|
|
.p2align 5
|
|
L(loop):
|
|
/* Load two words, compare and merge in a
|
|
single register for speed. This is an attempt
|
|
to speed up the null-checking process for bigger strings. */
|
|
lwz r12,4(r8)
|
|
lwzu r9,8(r8)
|
|
cmpb r10,r12,r4
|
|
cmpb r11,r12,r0
|
|
cmpb r6,r9,r4
|
|
cmpb r7,r9,r0
|
|
or r12,r10,r11
|
|
or r9,r6,r7
|
|
or r5,r12,r9
|
|
cmpwi cr7,r5,0
|
|
beq cr7,L(loop)
|
|
|
|
/* OK, one (or both) of the words contains a c/null byte. Check
|
|
the first word and decrement the address in case the first
|
|
word really contains a c/null byte. */
|
|
|
|
cmpwi cr6,r12,0
|
|
addi r8,r8,-4
|
|
bne cr6,L(done)
|
|
|
|
/* The c/null byte must be in the second word. Adjust the address
|
|
again and move the result of cmpb to r10/r11 so we can calculate
|
|
the pointer. */
|
|
|
|
mr r10,r6
|
|
mr r11,r7
|
|
addi r8,r8,4
|
|
|
|
/* r10/r11 have the output of the cmpb instructions, that is,
|
|
0xff in the same position as the c/null byte in the original
|
|
word from the string. Use that to calculate the pointer. */
|
|
L(done):
|
|
#ifdef __LITTLE_ENDIAN__
|
|
addi r3,r10,-1
|
|
andc r3,r3,r10
|
|
popcntw r0,r3
|
|
addi r4,r11,-1
|
|
andc r4,r4,r11
|
|
cmplw cr7,r3,r4
|
|
bgt cr7,L(no_match)
|
|
#else
|
|
cntlzw r0,r10 /* Count leading zeros before c matches. */
|
|
cmplw cr7,r11,r10
|
|
bgt cr7,L(no_match)
|
|
#endif
|
|
srwi r0,r0,3 /* Convert leading zeros to bytes. */
|
|
add r3,r8,r0 /* Return address of the matching c byte
|
|
or null in case c was not found. */
|
|
blr
|
|
|
|
.align 4
|
|
L(no_match):
|
|
li r3,0
|
|
blr
|
|
|
|
/* We are here because strchr was called with a null byte. */
|
|
.align 4
|
|
L(null_match):
|
|
/* r0 has a word of null bytes. */
|
|
|
|
cmpb r5,r12,r0 /* Compare each byte against null bytes. */
|
|
|
|
/* Move the words left and right to discard the bits that are
|
|
not part of the string and bring them back as zeros. */
|
|
#ifdef __LITTLE_ENDIAN__
|
|
srw r5,r5,r6
|
|
slw r5,r5,r6
|
|
#else
|
|
slw r5,r5,r6
|
|
srw r5,r5,r6
|
|
#endif
|
|
cmpwi cr7,r5,0 /* If r10 == 0, no c or null bytes
|
|
have been found. */
|
|
bne cr7,L(done_null)
|
|
|
|
mtcrf 0x01,r8
|
|
|
|
/* Are we now aligned to a doubleword boundary? If so, skip to
|
|
the main loop. Otherwise, go through the alignment code. */
|
|
|
|
bt 29,L(loop_null)
|
|
|
|
/* Handle WORD2 of pair. */
|
|
lwzu r12,4(r8)
|
|
cmpb r5,r12,r0
|
|
cmpwi cr7,r5,0
|
|
bne cr7,L(done_null)
|
|
b L(loop_null) /* We branch here (rather than falling through)
|
|
to skip the nops due to heavy alignment
|
|
of the loop below. */
|
|
|
|
/* Main loop to look for the end of the string. Since it's a
|
|
small loop (< 8 instructions), align it to 32-bytes. */
|
|
.p2align 5
|
|
L(loop_null):
|
|
/* Load two words, compare and merge in a
|
|
single register for speed. This is an attempt
|
|
to speed up the null-checking process for bigger strings. */
|
|
lwz r12,4(r8)
|
|
lwzu r11,8(r8)
|
|
cmpb r5,r12,r0
|
|
cmpb r10,r11,r0
|
|
or r6,r5,r10
|
|
cmpwi cr7,r6,0
|
|
beq cr7,L(loop_null)
|
|
|
|
/* OK, one (or both) of the words contains a null byte. Check
|
|
the first word and decrement the address in case the first
|
|
word really contains a null byte. */
|
|
|
|
cmpwi cr6,r5,0
|
|
addi r8,r8,-4
|
|
bne cr6,L(done_null)
|
|
|
|
/* The null byte must be in the second word. Adjust the address
|
|
again and move the result of cmpb to r10 so we can calculate the
|
|
pointer. */
|
|
|
|
mr r5,r10
|
|
addi r8,r8,4
|
|
|
|
/* r5 has the output of the cmpb instruction, that is, it contains
|
|
0xff in the same position as the null byte in the original
|
|
word from the string. Use that to calculate the pointer. */
|
|
L(done_null):
|
|
#ifdef __LITTLE_ENDIAN__
|
|
addi r0,r5,-1
|
|
andc r0,r0,r5
|
|
popcntw r0,r0
|
|
#else
|
|
cntlzw r0,r5 /* Count leading zeros before the match. */
|
|
#endif
|
|
srwi r0,r0,3 /* Convert leading zeros to bytes. */
|
|
add r3,r8,r0 /* Return address of the matching null byte. */
|
|
blr
|
|
END (strchr)
|
|
weak_alias (strchr, index)
|
|
libc_hidden_builtin_def (strchr)
|