mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-03 04:01:43 +08:00
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
268 lines
7.1 KiB
ArmAsm
268 lines
7.1 KiB
ArmAsm
/* strchrnul (str, ch) -- Return pointer to first occurrence of CH in STR
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or the final NUL byte.
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For Motorola 68000.
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Copyright (C) 1999-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Andreas Schwab <schwab@gnu.org>.
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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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TEXT
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ENTRY(__strchrnul)
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/* Save the callee-saved registers we use. */
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movel R(d2),MEM_PREDEC(sp)
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cfi_adjust_cfa_offset (4)
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movel R(d3),MEM_PREDEC(sp)
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cfi_adjust_cfa_offset (4)
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cfi_rel_offset (R(d2), 4)
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cfi_rel_offset (R(d3), 0)
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/* Get string pointer and character. */
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movel MEM_DISP(sp,12),R(a0)
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moveb MEM_DISP(sp,19),R(d0)
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/* Distribute the character to all bytes of a longword. */
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movel R(d0),R(d1)
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lsll #8,R(d1)
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moveb R(d0),R(d1)
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movel R(d1),R(d0)
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swap R(d0)
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movew R(d1),R(d0)
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/* First search for the character one byte at a time until the
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pointer is aligned to a longword boundary. */
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movel R(a0),R(d1)
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#ifdef __mcoldfire__
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andl #3,R(d1)
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#else
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andw #3,R(d1)
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#endif
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beq L(L1)
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moveb MEM(a0),R(d2)
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cmpb R(d0),R(d2)
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beq L(L9)
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tstb R(d2)
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beq L(L9)
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addql #1,R(a0)
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#ifdef __mcoldfire__
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subql #3,R(d1)
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#else
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subqw #3,R(d1)
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#endif
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beq L(L1)
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moveb MEM(a0),R(d2)
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cmpb R(d0),R(d2)
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beq L(L9)
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tstb R(d2)
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beq L(L9)
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addql #1,R(a0)
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#ifdef __mcoldfire__
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addql #1,R(d1)
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#else
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addqw #1,R(d1)
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#endif
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beq L(L1)
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moveb MEM(a0),R(d2)
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cmpb R(d0),R(d2)
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beq L(L9)
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tstb R(d2)
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beq L(L9)
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addql #1,R(a0)
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L(L1:)
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/* Load the magic bits. Unlike the generic implementation we can
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use the carry bit as the fourth hole. */
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movel #0xfefefeff,R(d3)
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/* We exit the loop if adding MAGIC_BITS to LONGWORD fails to
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change any of the hole bits of LONGWORD.
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1) Is this safe? Will it catch all the zero bytes?
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Suppose there is a byte with all zeros. Any carry bits
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propagating from its left will fall into the hole at its
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least significant bit and stop. Since there will be no
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carry from its most significant bit, the LSB of the
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byte to the left will be unchanged, and the zero will be
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detected.
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2) Is this worthwhile? Will it ignore everything except
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zero bytes? Suppose every byte of LONGWORD has a bit set
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somewhere. There will be a carry into bit 8. If bit 8
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is set, this will carry into bit 16. If bit 8 is clear,
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one of bits 9-15 must be set, so there will be a carry
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into bit 16. Similarly, there will be a carry into bit
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24. If one of bits 24-31 is set, there will be a carry
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into bit 32 (=carry flag), so all of the hole bits will
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be changed.
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3) But wait! Aren't we looking for C, not zero?
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Good point. So what we do is XOR LONGWORD with a longword,
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each of whose bytes is C. This turns each byte that is C
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into a zero. */
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L(L2:)
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/* Get the longword in question. */
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movel MEM_POSTINC(a0),R(d1)
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/* XOR with the byte we search for. */
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eorl R(d0),R(d1)
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/* Add the magic value. We get carry bits reported for each byte
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which is not C. */
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movel R(d3),R(d2)
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addl R(d1),R(d2)
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/* Check the fourth carry bit before it is clobbered by the next
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XOR. If it is not set we have a hit. */
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bcc L(L8)
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/* We are only interested in carry bits that change due to the
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previous add, so remove original bits. */
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eorl R(d1),R(d2)
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/* Now test for the other three overflow bits.
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Set all non-carry bits. */
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orl R(d3),R(d2)
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/* Add 1 to get zero if all carry bits were set. */
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addql #1,R(d2)
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/* If we don't get zero then at least one byte of the word equals
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C. */
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bne L(L8)
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/* Next look for a NUL byte.
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Restore original longword without reload. */
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eorl R(d0),R(d1)
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/* Add the magic value. We get carry bits reported for each byte
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which is not NUL. */
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movel R(d3),R(d2)
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addl R(d1),R(d2)
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/* Check the fourth carry bit before it is clobbered by the next
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XOR. If it is not set we have a hit. */
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bcc L(L8)
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/* We are only interested in carry bits that change due to the
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previous add, so remove original bits. */
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eorl R(d1),R(d2)
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/* Now test for the other three overflow bits.
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Set all non-carry bits. */
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orl R(d3),R(d2)
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/* Add 1 to get zero if all carry bits were set. */
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addql #1,R(d2)
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/* If we don't get zero then at least one byte of the word was
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NUL. Otherwise continue with the next longword. */
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bne L(L8)
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/* Get the longword in question. */
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movel MEM_POSTINC(a0),R(d1)
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/* XOR with the byte we search for. */
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eorl R(d0),R(d1)
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/* Add the magic value. We get carry bits reported for each byte
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which is not C. */
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movel R(d3),R(d2)
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addl R(d1),R(d2)
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/* Check the fourth carry bit before it is clobbered by the next
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XOR. If it is not set we have a hit. */
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bcc L(L8)
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/* We are only interested in carry bits that change due to the
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previous add, so remove original bits */
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eorl R(d1),R(d2)
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/* Now test for the other three overflow bits.
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Set all non-carry bits. */
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orl R(d3),R(d2)
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/* Add 1 to get zero if all carry bits were set. */
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addql #1,R(d2)
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/* If we don't get zero then at least one byte of the word equals
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C. */
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bne L(L8)
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/* Next look for a NUL byte.
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Restore original longword without reload. */
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eorl R(d0),R(d1)
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/* Add the magic value. We get carry bits reported for each byte
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which is not NUL. */
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movel R(d3),R(d2)
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addl R(d1),R(d2)
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/* Check the fourth carry bit before it is clobbered by the next
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XOR. If it is not set we have a hit. */
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bcc L(L8)
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/* We are only interested in carry bits that change due to the
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previous add, so remove original bits */
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eorl R(d1),R(d2)
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/* Now test for the other three overflow bits.
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Set all non-carry bits. */
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orl R(d3),R(d2)
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/* Add 1 to get zero if all carry bits were set. */
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addql #1,R(d2)
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/* If we don't get zero then at least one byte of the word was
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NUL. Otherwise continue with the next longword. */
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beq L(L2)
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L(L8:)
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/* We have a hit. Check to see which byte it was. First
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compensate for the autoincrement in the loop. */
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subql #4,R(a0)
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moveb MEM(a0),R(d1)
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cmpb R(d0),R(d1)
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beq L(L9)
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tstb R(d1)
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beq L(L9)
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addql #1,R(a0)
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moveb MEM(a0),R(d1)
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cmpb R(d0),R(d1)
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beq L(L9)
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tstb R(d1)
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beq L(L9)
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addql #1,R(a0)
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moveb MEM(a0),R(d1)
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cmpb R(d0),R(d1)
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beq L(L9)
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tstb R(d1)
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beq L(L9)
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addql #1,R(a0)
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/* Otherwise the fourth byte must equal C or be NUL. */
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L(L9:)
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movel R(a0),R(d0)
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movel MEM_POSTINC(sp),R(d3)
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cfi_adjust_cfa_offset (-4)
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cfi_restore (R(d3))
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movel MEM_POSTINC(sp),R(d2)
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cfi_adjust_cfa_offset (-4)
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cfi_restore (R(d2))
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rts
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END(__strchrnul)
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weak_alias (__strchrnul, strchrnul)
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