2011-01-12 18:59:09 +00:00
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/* Optimized strcpy implementation for PowerPC476.
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2020-01-01 00:14:33 +00:00
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Copyright (C) 2010-2020 Free Software Foundation, Inc.
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2011-01-12 18:59:09 +00:00
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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
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License as published by the Free Software Foundation; either
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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,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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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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2012-03-09 23:56:38 +00:00
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License along with the GNU C Library. If not, see
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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
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<https://www.gnu.org/licenses/>. */
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2011-01-12 18:59:09 +00:00
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#include <sysdep.h>
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/* strcpy
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Register Use
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r3:destination and return address
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r4:source address
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r10:temp destination address
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Implementation description
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Loop by checking 2 words at a time, with dlmzb. Check if there is a null
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in the 2 words. If there is a null jump to end checking to determine
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where in the last 8 bytes it is. Copy the appropriate bytes of the last
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8 according to the null position. */
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2013-02-28 21:23:47 +00:00
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EALIGN (strcpy, 5, 0)
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2011-01-12 18:59:09 +00:00
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neg r7,r4
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subi r4,r4,1
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clrlwi. r8,r7,29
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subi r10,r3,1
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beq L(pre_word8_loop)
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mtctr r8
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L(loop):
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lbzu r5,0x01(r4)
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cmpi cr5,r5,0x0
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stbu r5,0x01(r10)
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beq cr5,L(end_strcpy)
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bdnz L(loop)
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L(pre_word8_loop):
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subi r4,r4,3
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subi r10,r10,3
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L(word8_loop):
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lwzu r5,0x04(r4)
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lwzu r6,0x04(r4)
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dlmzb. r11,r5,r6
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bne L(byte_copy)
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stwu r5,0x04(r10)
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stwu r6,0x04(r10)
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lwzu r5,0x04(r4)
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lwzu r6,0x04(r4)
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dlmzb. r11,r5,r6
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bne L(byte_copy)
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stwu r5,0x04(r10)
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stwu r6,0x04(r10)
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lwzu r5,0x04(r4)
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lwzu r6,0x04(r4)
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dlmzb. r11,r5,r6
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bne L(byte_copy)
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stwu r5,0x04(r10)
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stwu r6,0x04(r10)
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lwzu r5,0x04(r4)
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lwzu r6,0x04(r4)
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dlmzb. r11,r5,r6
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bne L(byte_copy)
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stwu r5,0x04(r10)
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stwu r6,0x04(r10)
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b L(word8_loop)
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L(last_bytes_copy):
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stwu r5,0x04(r10)
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subi r11,r11,4
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mtctr r11
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addi r10,r10,3
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subi r4,r4,1
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L(last_bytes_copy_loop):
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lbzu r5,0x01(r4)
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stbu r5,0x01(r10)
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bdnz L(last_bytes_copy_loop)
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blr
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L(byte_copy):
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blt L(last_bytes_copy)
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mtctr r11
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addi r10,r10,3
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subi r4,r4,5
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L(last_bytes_copy_loop2):
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lbzu r5,0x01(r4)
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stbu r5,0x01(r10)
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bdnz L(last_bytes_copy_loop2)
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L(end_strcpy):
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blr
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2013-02-28 21:23:47 +00:00
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END (strcpy)
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2011-01-12 18:59:09 +00:00
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libc_hidden_builtin_def (strcpy)
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