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
155 lines
3.4 KiB
ArmAsm
155 lines
3.4 KiB
ArmAsm
/* memcmp - compare memory
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Copyright (C) 2013-2019 Free Software Foundation, Inc.
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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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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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/* Assumptions:
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*
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* ARMv8-a, AArch64, unaligned accesses.
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*/
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/* Parameters and result. */
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#define src1 x0
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#define src2 x1
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#define limit x2
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#define result w0
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/* Internal variables. */
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#define data1 x3
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#define data1w w3
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#define data1h x4
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#define data2 x5
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#define data2w w5
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#define data2h x6
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#define tmp1 x7
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#define tmp2 x8
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ENTRY_ALIGN (memcmp, 6)
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DELOUSE (0)
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DELOUSE (1)
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DELOUSE (2)
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subs limit, limit, 8
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b.lo L(less8)
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ldr data1, [src1], 8
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ldr data2, [src2], 8
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cmp data1, data2
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b.ne L(return)
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subs limit, limit, 8
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b.gt L(more16)
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ldr data1, [src1, limit]
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ldr data2, [src2, limit]
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b L(return)
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L(more16):
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ldr data1, [src1], 8
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ldr data2, [src2], 8
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cmp data1, data2
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bne L(return)
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/* Jump directly to comparing the last 16 bytes for 32 byte (or less)
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strings. */
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subs limit, limit, 16
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b.ls L(last_bytes)
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/* We overlap loads between 0-32 bytes at either side of SRC1 when we
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try to align, so limit it only to strings larger than 128 bytes. */
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cmp limit, 96
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b.ls L(loop16)
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/* Align src1 and adjust src2 with bytes not yet done. */
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and tmp1, src1, 15
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add limit, limit, tmp1
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sub src1, src1, tmp1
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sub src2, src2, tmp1
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/* Loop performing 16 bytes per iteration using aligned src1.
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Limit is pre-decremented by 16 and must be larger than zero.
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Exit if <= 16 bytes left to do or if the data is not equal. */
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.p2align 4
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L(loop16):
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ldp data1, data1h, [src1], 16
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ldp data2, data2h, [src2], 16
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subs limit, limit, 16
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ccmp data1, data2, 0, hi
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ccmp data1h, data2h, 0, eq
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b.eq L(loop16)
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cmp data1, data2
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bne L(return)
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mov data1, data1h
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mov data2, data2h
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cmp data1, data2
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bne L(return)
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/* Compare last 1-16 bytes using unaligned access. */
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L(last_bytes):
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add src1, src1, limit
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add src2, src2, limit
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ldp data1, data1h, [src1]
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ldp data2, data2h, [src2]
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cmp data1, data2
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bne L(return)
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mov data1, data1h
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mov data2, data2h
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cmp data1, data2
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/* Compare data bytes and set return value to 0, -1 or 1. */
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L(return):
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#ifndef __AARCH64EB__
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rev data1, data1
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rev data2, data2
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#endif
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cmp data1, data2
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L(ret_eq):
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cset result, ne
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cneg result, result, lo
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ret
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.p2align 4
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/* Compare up to 8 bytes. Limit is [-8..-1]. */
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L(less8):
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adds limit, limit, 4
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b.lo L(less4)
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ldr data1w, [src1], 4
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ldr data2w, [src2], 4
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cmp data1w, data2w
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b.ne L(return)
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sub limit, limit, 4
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L(less4):
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adds limit, limit, 4
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beq L(ret_eq)
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L(byte_loop):
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ldrb data1w, [src1], 1
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ldrb data2w, [src2], 1
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subs limit, limit, 1
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ccmp data1w, data2w, 0, ne /* NZCV = 0b0000. */
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b.eq L(byte_loop)
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sub result, data1w, data2w
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ret
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END (memcmp)
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#undef bcmp
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weak_alias (memcmp, bcmp)
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libc_hidden_builtin_def (memcmp)
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