mirror of
https://sourceware.org/git/glibc.git
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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
259 lines
8.7 KiB
ArmAsm
259 lines
8.7 KiB
ArmAsm
/* strcat(dest, src) -- Append SRC on the end of DEST.
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Optimized for x86-64.
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Copyright (C) 2002-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Andreas Jaeger <aj@suse.de>, 2002.
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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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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include "asm-syntax.h"
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/* Will be removed when new strcpy implementation gets merged. */
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.text
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ENTRY (strcat)
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movq %rdi, %rcx /* Dest. register. */
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andl $7, %ecx /* mask alignment bits */
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movq %rdi, %rax /* Duplicate destination pointer. */
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movq $0xfefefefefefefeff,%r8
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/* First step: Find end of destination. */
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jz 4f /* aligned => start loop */
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neg %ecx /* We need to align to 8 bytes. */
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addl $8,%ecx
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/* Search the first bytes directly. */
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0: cmpb $0x0,(%rax) /* is byte NUL? */
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je 2f /* yes => start copy */
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incq %rax /* increment pointer */
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decl %ecx
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jnz 0b
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/* Now the source is aligned. Scan for NUL byte. */
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.p2align 4
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4:
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/* First unroll. */
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movq (%rax), %rcx /* get double word (= 8 bytes) in question */
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addq $8,%rax /* adjust pointer for next word */
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movq %r8, %rdx /* magic value */
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addq %rcx, %rdx /* add the magic value to the word. We get
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carry bits reported for each byte which
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is *not* 0 */
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jnc 3f /* highest byte is NUL => return pointer */
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xorq %rcx, %rdx /* (word+magic)^word */
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orq %r8, %rdx /* set all non-carry bits */
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incq %rdx /* add 1: if one carry bit was *not* set
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the addition will not result in 0. */
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jnz 3f /* found NUL => return pointer */
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/* Second unroll. */
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movq (%rax), %rcx /* get double word (= 8 bytes) in question */
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addq $8,%rax /* adjust pointer for next word */
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movq %r8, %rdx /* magic value */
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addq %rcx, %rdx /* add the magic value to the word. We get
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carry bits reported for each byte which
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is *not* 0 */
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jnc 3f /* highest byte is NUL => return pointer */
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xorq %rcx, %rdx /* (word+magic)^word */
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orq %r8, %rdx /* set all non-carry bits */
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incq %rdx /* add 1: if one carry bit was *not* set
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the addition will not result in 0. */
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jnz 3f /* found NUL => return pointer */
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/* Third unroll. */
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movq (%rax), %rcx /* get double word (= 8 bytes) in question */
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addq $8,%rax /* adjust pointer for next word */
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movq %r8, %rdx /* magic value */
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addq %rcx, %rdx /* add the magic value to the word. We get
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carry bits reported for each byte which
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is *not* 0 */
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jnc 3f /* highest byte is NUL => return pointer */
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xorq %rcx, %rdx /* (word+magic)^word */
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orq %r8, %rdx /* set all non-carry bits */
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incq %rdx /* add 1: if one carry bit was *not* set
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the addition will not result in 0. */
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jnz 3f /* found NUL => return pointer */
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/* Fourth unroll. */
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movq (%rax), %rcx /* get double word (= 8 bytes) in question */
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addq $8,%rax /* adjust pointer for next word */
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movq %r8, %rdx /* magic value */
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addq %rcx, %rdx /* add the magic value to the word. We get
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carry bits reported for each byte which
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is *not* 0 */
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jnc 3f /* highest byte is NUL => return pointer */
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xorq %rcx, %rdx /* (word+magic)^word */
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orq %r8, %rdx /* set all non-carry bits */
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incq %rdx /* add 1: if one carry bit was *not* set
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the addition will not result in 0. */
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jz 4b /* no NUL found => continue loop */
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.p2align 4 /* Align, it's a jump target. */
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3: subq $8,%rax /* correct pointer increment. */
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testb %cl, %cl /* is first byte NUL? */
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jz 2f /* yes => return */
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incq %rax /* increment pointer */
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testb %ch, %ch /* is second byte NUL? */
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jz 2f /* yes => return */
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incq %rax /* increment pointer */
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testl $0x00ff0000, %ecx /* is third byte NUL? */
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jz 2f /* yes => return pointer */
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incq %rax /* increment pointer */
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testl $0xff000000, %ecx /* is fourth byte NUL? */
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jz 2f /* yes => return pointer */
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incq %rax /* increment pointer */
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shrq $32, %rcx /* look at other half. */
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testb %cl, %cl /* is first byte NUL? */
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jz 2f /* yes => return */
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incq %rax /* increment pointer */
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testb %ch, %ch /* is second byte NUL? */
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jz 2f /* yes => return */
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incq %rax /* increment pointer */
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testl $0xff0000, %ecx /* is third byte NUL? */
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jz 2f /* yes => return pointer */
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incq %rax /* increment pointer */
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2:
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/* Second step: Copy source to destination. */
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movq %rsi, %rcx /* duplicate */
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andl $7,%ecx /* mask alignment bits */
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movq %rax, %rdx /* move around */
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jz 22f /* aligned => start loop */
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neg %ecx /* align to 8 bytes. */
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addl $8, %ecx
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/* Align the source pointer. */
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21:
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movb (%rsi), %al /* Fetch a byte */
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testb %al, %al /* Is it NUL? */
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movb %al, (%rdx) /* Store it */
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jz 24f /* If it was NUL, done! */
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incq %rsi
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incq %rdx
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decl %ecx
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jnz 21b
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/* Now the sources is aligned. Unfortunatly we cannot force
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to have both source and destination aligned, so ignore the
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alignment of the destination. */
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.p2align 4
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22:
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/* 1st unroll. */
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movq (%rsi), %rax /* Read double word (8 bytes). */
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addq $8, %rsi /* Adjust pointer for next word. */
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movq %rax, %r9 /* Save a copy for NUL finding. */
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addq %r8, %r9 /* add the magic value to the word. We get
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carry bits reported for each byte which
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is *not* 0 */
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jnc 23f /* highest byte is NUL => return pointer */
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xorq %rax, %r9 /* (word+magic)^word */
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orq %r8, %r9 /* set all non-carry bits */
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incq %r9 /* add 1: if one carry bit was *not* set
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the addition will not result in 0. */
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jnz 23f /* found NUL => return pointer */
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movq %rax, (%rdx) /* Write value to destination. */
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addq $8, %rdx /* Adjust pointer. */
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/* 2nd unroll. */
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movq (%rsi), %rax /* Read double word (8 bytes). */
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addq $8, %rsi /* Adjust pointer for next word. */
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movq %rax, %r9 /* Save a copy for NUL finding. */
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addq %r8, %r9 /* add the magic value to the word. We get
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carry bits reported for each byte which
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is *not* 0 */
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jnc 23f /* highest byte is NUL => return pointer */
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xorq %rax, %r9 /* (word+magic)^word */
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orq %r8, %r9 /* set all non-carry bits */
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incq %r9 /* add 1: if one carry bit was *not* set
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the addition will not result in 0. */
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jnz 23f /* found NUL => return pointer */
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movq %rax, (%rdx) /* Write value to destination. */
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addq $8, %rdx /* Adjust pointer. */
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/* 3rd unroll. */
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movq (%rsi), %rax /* Read double word (8 bytes). */
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addq $8, %rsi /* Adjust pointer for next word. */
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movq %rax, %r9 /* Save a copy for NUL finding. */
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addq %r8, %r9 /* add the magic value to the word. We get
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carry bits reported for each byte which
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is *not* 0 */
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jnc 23f /* highest byte is NUL => return pointer */
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xorq %rax, %r9 /* (word+magic)^word */
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orq %r8, %r9 /* set all non-carry bits */
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incq %r9 /* add 1: if one carry bit was *not* set
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the addition will not result in 0. */
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jnz 23f /* found NUL => return pointer */
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movq %rax, (%rdx) /* Write value to destination. */
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addq $8, %rdx /* Adjust pointer. */
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/* 4th unroll. */
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movq (%rsi), %rax /* Read double word (8 bytes). */
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addq $8, %rsi /* Adjust pointer for next word. */
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movq %rax, %r9 /* Save a copy for NUL finding. */
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addq %r8, %r9 /* add the magic value to the word. We get
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carry bits reported for each byte which
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is *not* 0 */
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jnc 23f /* highest byte is NUL => return pointer */
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xorq %rax, %r9 /* (word+magic)^word */
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orq %r8, %r9 /* set all non-carry bits */
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incq %r9 /* add 1: if one carry bit was *not* set
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the addition will not result in 0. */
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jnz 23f /* found NUL => return pointer */
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movq %rax, (%rdx) /* Write value to destination. */
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addq $8, %rdx /* Adjust pointer. */
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jmp 22b /* Next iteration. */
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/* Do the last few bytes. %rax contains the value to write.
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The loop is unrolled twice. */
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.p2align 4
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23:
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movb %al, (%rdx) /* 1st byte. */
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testb %al, %al /* Is it NUL. */
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jz 24f /* yes, finish. */
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incq %rdx /* Increment destination. */
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movb %ah, (%rdx) /* 2nd byte. */
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testb %ah, %ah /* Is it NUL?. */
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jz 24f /* yes, finish. */
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incq %rdx /* Increment destination. */
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shrq $16, %rax /* Shift... */
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jmp 23b /* and look at next two bytes in %rax. */
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24:
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movq %rdi, %rax /* Source is return value. */
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retq
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END (strcat)
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libc_hidden_builtin_def (strcat)
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