2018-12-21 01:48:04 +00:00
|
|
|
/* The assembly function for memory compare. C-SKY ABIV2 version.
|
2020-01-01 00:14:33 +00:00
|
|
|
Copyright (C) 2018-2020 Free Software Foundation, Inc.
|
2018-12-21 01:48:04 +00:00
|
|
|
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
|
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
|
|
|
<https://www.gnu.org/licenses/>. */
|
2018-12-21 01:48:04 +00:00
|
|
|
|
|
|
|
|
#include <sysdep.h>
|
|
|
|
|
|
|
|
|
|
ENTRY (memcmp)
|
|
|
|
|
/* Test if len less than 4 bytes. */
|
|
|
|
|
mov r3, r0
|
|
|
|
|
movi r0, 0
|
|
|
|
|
mov r12, r4
|
|
|
|
|
cmplti r2, 4
|
|
|
|
|
jbt .L_compare_by_byte
|
|
|
|
|
|
|
|
|
|
andi r13, r0, 3
|
|
|
|
|
movi r19, 4
|
|
|
|
|
/* Test if s1 is not 4 bytes aligned. */
|
|
|
|
|
bnez r13, .L_s1_not_aligned
|
|
|
|
|
|
|
|
|
|
LABLE_ALIGN
|
|
|
|
|
.L_s1_aligned:
|
|
|
|
|
/* If dest is aligned, then copy. */
|
|
|
|
|
zext r18, r2, 31, 4
|
|
|
|
|
/* Test if len less than 16 bytes. */
|
|
|
|
|
bez r18, .L_compare_by_word
|
|
|
|
|
|
|
|
|
|
.L_compare_by_4word:
|
|
|
|
|
/* If aligned, load word each time. */
|
|
|
|
|
ldw r20, (r3, 0)
|
|
|
|
|
ldw r21, (r1, 0)
|
|
|
|
|
/* If s1[i] != s2[i], goto .L_byte_check. */
|
|
|
|
|
cmpne r20, r21
|
|
|
|
|
bt .L_byte_check
|
|
|
|
|
|
|
|
|
|
ldw r20, (r3, 4)
|
|
|
|
|
ldw r21, (r1, 4)
|
|
|
|
|
cmpne r20, r21
|
|
|
|
|
bt .L_byte_check
|
|
|
|
|
|
|
|
|
|
ldw r20, (r3, 8)
|
|
|
|
|
ldw r21, (r1, 8)
|
|
|
|
|
cmpne r20, r21
|
|
|
|
|
bt .L_byte_check
|
|
|
|
|
|
|
|
|
|
ldw r20, (r3, 12)
|
|
|
|
|
ldw r21, (r1, 12)
|
|
|
|
|
cmpne r20, r21
|
|
|
|
|
bt .L_byte_check
|
|
|
|
|
|
|
|
|
|
PRE_BNEZAD (r18)
|
|
|
|
|
addi a3, 16
|
|
|
|
|
addi a1, 16
|
|
|
|
|
|
|
|
|
|
BNEZAD (r18, .L_compare_by_4word)
|
|
|
|
|
|
|
|
|
|
.L_compare_by_word:
|
|
|
|
|
zext r18, r2, 3, 2
|
|
|
|
|
bez r18, .L_compare_by_byte
|
|
|
|
|
.L_compare_by_word_loop:
|
|
|
|
|
ldw r20, (r3, 0)
|
|
|
|
|
ldw r21, (r1, 0)
|
|
|
|
|
addi r3, 4
|
|
|
|
|
PRE_BNEZAD (r18)
|
|
|
|
|
cmpne r20, r21
|
|
|
|
|
addi r1, 4
|
|
|
|
|
bt .L_byte_check
|
|
|
|
|
BNEZAD (r18, .L_compare_by_word_loop)
|
|
|
|
|
|
|
|
|
|
.L_compare_by_byte:
|
|
|
|
|
zext r18, r2, 1, 0
|
|
|
|
|
bez r18, .L_return
|
|
|
|
|
.L_compare_by_byte_loop:
|
|
|
|
|
ldb r0, (r3, 0)
|
|
|
|
|
ldb r4, (r1, 0)
|
|
|
|
|
addi r3, 1
|
|
|
|
|
subu r0, r4
|
|
|
|
|
PRE_BNEZAD (r18)
|
|
|
|
|
addi r1, 1
|
|
|
|
|
bnez r0, .L_return
|
|
|
|
|
BNEZAD (r18, .L_compare_by_byte_loop)
|
|
|
|
|
|
|
|
|
|
.L_return:
|
|
|
|
|
mov r4, r12
|
|
|
|
|
rts
|
|
|
|
|
|
|
|
|
|
/* s1[i] != s2[i] in word, so we check byte 3. */
|
|
|
|
|
.L_byte_check:
|
|
|
|
|
xtrb3 r0, r20
|
|
|
|
|
xtrb3 r2, r21
|
|
|
|
|
subu r0, r2
|
|
|
|
|
bnez r0, .L_return
|
|
|
|
|
|
|
|
|
|
/* check byte 2 */
|
|
|
|
|
xtrb2 r0, r20
|
|
|
|
|
xtrb2 r2, r21
|
|
|
|
|
subu r0, r2
|
|
|
|
|
bnez r0, .L_return
|
|
|
|
|
|
|
|
|
|
/* check byte 1 */
|
|
|
|
|
xtrb1 r0, r20
|
|
|
|
|
xtrb1 r2, r21
|
|
|
|
|
subu r0, r2
|
|
|
|
|
bnez r0, .L_return
|
|
|
|
|
|
|
|
|
|
/* check byte 0 */
|
|
|
|
|
xtrb0 r0, r20
|
|
|
|
|
xtrb0 r2, r21
|
|
|
|
|
subu r0, r2
|
|
|
|
|
br .L_return
|
|
|
|
|
|
|
|
|
|
/* Compare when s1 is not aligned. */
|
|
|
|
|
.L_s1_not_aligned:
|
|
|
|
|
sub r13, r19, r13
|
|
|
|
|
sub r2, r13
|
|
|
|
|
.L_s1_not_aligned_loop:
|
|
|
|
|
ldb r0, (r3, 0)
|
|
|
|
|
ldb r4, (r1, 0)
|
|
|
|
|
addi r3, 1
|
|
|
|
|
subu r0, r4
|
|
|
|
|
PRE_BNEZAD (r13)
|
|
|
|
|
addi r1, 1
|
|
|
|
|
bnez r0, .L_return
|
|
|
|
|
BNEZAD (r13, .L_s1_not_aligned_loop)
|
|
|
|
|
br .L_s1_aligned
|
|
|
|
|
END (memcmp)
|
|
|
|
|
weak_alias (memcmp, bcmp)
|
|
|
|
|
libc_hidden_def (memcmp)
|
|
|
|
|
.weak memcmp
|
