mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-26 23:10:06 +00:00
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
433 lines
9.4 KiB
ArmAsm
433 lines
9.4 KiB
ArmAsm
/* memcmp/wmemcmp optimized with AVX2.
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Copyright (C) 2017-2019 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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#if IS_IN (libc)
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/* memcmp/wmemcmp is implemented as:
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1. For size from 2 to 7 bytes, load as big endian with movbe and bswap
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to avoid branches.
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2. Use overlapping compare to avoid branch.
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3. Use vector compare when size >= 4 bytes for memcmp or size >= 8
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bytes for wmemcmp.
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4. If size is 8 * VEC_SIZE or less, unroll the loop.
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5. Compare 4 * VEC_SIZE at a time with the aligned first memory
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area.
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6. Use 2 vector compares when size is 2 * VEC_SIZE or less.
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7. Use 4 vector compares when size is 4 * VEC_SIZE or less.
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8. Use 8 vector compares when size is 8 * VEC_SIZE or less. */
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# include <sysdep.h>
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# ifndef MEMCMP
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# define MEMCMP __memcmp_avx2_movbe
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# endif
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# ifdef USE_AS_WMEMCMP
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# define VPCMPEQ vpcmpeqd
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# else
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# define VPCMPEQ vpcmpeqb
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# endif
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# ifndef VZEROUPPER
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# define VZEROUPPER vzeroupper
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# endif
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# define VEC_SIZE 32
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# define VEC_MASK ((1 << VEC_SIZE) - 1)
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/* Warning!
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wmemcmp has to use SIGNED comparison for elements.
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memcmp has to use UNSIGNED comparison for elemnts.
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*/
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.section .text.avx,"ax",@progbits
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ENTRY (MEMCMP)
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# ifdef USE_AS_WMEMCMP
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shl $2, %RDX_LP
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# elif defined __ILP32__
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/* Clear the upper 32 bits. */
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movl %edx, %edx
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# endif
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cmp $VEC_SIZE, %RDX_LP
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jb L(less_vec)
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/* From VEC to 2 * VEC. No branch when size == VEC_SIZE. */
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vmovdqu (%rsi), %ymm2
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VPCMPEQ (%rdi), %ymm2, %ymm2
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vpmovmskb %ymm2, %eax
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subl $VEC_MASK, %eax
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jnz L(first_vec)
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cmpq $(VEC_SIZE * 2), %rdx
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jbe L(last_vec)
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VPCMPEQ %ymm0, %ymm0, %ymm0
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/* More than 2 * VEC. */
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cmpq $(VEC_SIZE * 8), %rdx
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ja L(more_8x_vec)
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cmpq $(VEC_SIZE * 4), %rdx
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jb L(last_4x_vec)
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/* From 4 * VEC to 8 * VEC, inclusively. */
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vmovdqu (%rsi), %ymm1
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VPCMPEQ (%rdi), %ymm1, %ymm1
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vmovdqu VEC_SIZE(%rsi), %ymm2
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VPCMPEQ VEC_SIZE(%rdi), %ymm2, %ymm2
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vmovdqu (VEC_SIZE * 2)(%rsi), %ymm3
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VPCMPEQ (VEC_SIZE * 2)(%rdi), %ymm3, %ymm3
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vmovdqu (VEC_SIZE * 3)(%rsi), %ymm4
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VPCMPEQ (VEC_SIZE * 3)(%rdi), %ymm4, %ymm4
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vpand %ymm1, %ymm2, %ymm5
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vpand %ymm3, %ymm4, %ymm6
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vpand %ymm5, %ymm6, %ymm5
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vptest %ymm0, %ymm5
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jnc L(4x_vec_end)
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leaq -(4 * VEC_SIZE)(%rdi, %rdx), %rdi
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leaq -(4 * VEC_SIZE)(%rsi, %rdx), %rsi
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vmovdqu (%rsi), %ymm1
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VPCMPEQ (%rdi), %ymm1, %ymm1
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vmovdqu VEC_SIZE(%rsi), %ymm2
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VPCMPEQ VEC_SIZE(%rdi), %ymm2, %ymm2
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vpand %ymm2, %ymm1, %ymm5
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vmovdqu (VEC_SIZE * 2)(%rsi), %ymm3
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VPCMPEQ (VEC_SIZE * 2)(%rdi), %ymm3, %ymm3
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vpand %ymm3, %ymm5, %ymm5
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vmovdqu (VEC_SIZE * 3)(%rsi), %ymm4
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VPCMPEQ (VEC_SIZE * 3)(%rdi), %ymm4, %ymm4
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vpand %ymm4, %ymm5, %ymm5
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vptest %ymm0, %ymm5
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jnc L(4x_vec_end)
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xorl %eax, %eax
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VZEROUPPER
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ret
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.p2align 4
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L(last_2x_vec):
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/* From VEC to 2 * VEC. No branch when size == VEC_SIZE. */
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vmovdqu (%rsi), %ymm2
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VPCMPEQ (%rdi), %ymm2, %ymm2
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vpmovmskb %ymm2, %eax
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subl $VEC_MASK, %eax
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jnz L(first_vec)
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L(last_vec):
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/* Use overlapping loads to avoid branches. */
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leaq -VEC_SIZE(%rdi, %rdx), %rdi
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leaq -VEC_SIZE(%rsi, %rdx), %rsi
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vmovdqu (%rsi), %ymm2
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VPCMPEQ (%rdi), %ymm2, %ymm2
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vpmovmskb %ymm2, %eax
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subl $VEC_MASK, %eax
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jnz L(first_vec)
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VZEROUPPER
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ret
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.p2align 4
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L(first_vec):
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/* A byte or int32 is different within 16 or 32 bytes. */
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tzcntl %eax, %ecx
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# ifdef USE_AS_WMEMCMP
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xorl %eax, %eax
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movl (%rdi, %rcx), %edx
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cmpl (%rsi, %rcx), %edx
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L(wmemcmp_return):
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setl %al
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negl %eax
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orl $1, %eax
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# else
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movzbl (%rdi, %rcx), %eax
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movzbl (%rsi, %rcx), %edx
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sub %edx, %eax
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# endif
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VZEROUPPER
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ret
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# ifdef USE_AS_WMEMCMP
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.p2align 4
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L(4):
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xorl %eax, %eax
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movl (%rdi), %edx
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cmpl (%rsi), %edx
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jne L(wmemcmp_return)
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ret
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# else
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.p2align 4
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L(between_4_7):
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/* Load as big endian with overlapping movbe to avoid branches. */
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movbe (%rdi), %eax
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movbe (%rsi), %ecx
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shlq $32, %rax
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shlq $32, %rcx
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movbe -4(%rdi, %rdx), %edi
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movbe -4(%rsi, %rdx), %esi
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orq %rdi, %rax
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orq %rsi, %rcx
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subq %rcx, %rax
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je L(exit)
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sbbl %eax, %eax
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orl $1, %eax
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ret
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.p2align 4
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L(exit):
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ret
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.p2align 4
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L(between_2_3):
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/* Load as big endian to avoid branches. */
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movzwl (%rdi), %eax
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movzwl (%rsi), %ecx
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shll $8, %eax
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shll $8, %ecx
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bswap %eax
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bswap %ecx
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movb -1(%rdi, %rdx), %al
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movb -1(%rsi, %rdx), %cl
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/* Subtraction is okay because the upper 8 bits are zero. */
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subl %ecx, %eax
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ret
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.p2align 4
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L(1):
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movzbl (%rdi), %eax
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movzbl (%rsi), %ecx
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subl %ecx, %eax
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ret
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# endif
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.p2align 4
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L(zero):
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xorl %eax, %eax
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ret
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.p2align 4
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L(less_vec):
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# ifdef USE_AS_WMEMCMP
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/* It can only be 0, 4, 8, 12, 16, 20, 24, 28 bytes. */
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cmpb $4, %dl
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je L(4)
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jb L(zero)
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# else
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cmpb $1, %dl
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je L(1)
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jb L(zero)
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cmpb $4, %dl
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jb L(between_2_3)
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cmpb $8, %dl
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jb L(between_4_7)
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# endif
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cmpb $16, %dl
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jae L(between_16_31)
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/* It is between 8 and 15 bytes. */
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vmovq (%rdi), %xmm1
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vmovq (%rsi), %xmm2
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VPCMPEQ %xmm1, %xmm2, %xmm2
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vpmovmskb %xmm2, %eax
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subl $0xffff, %eax
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jnz L(first_vec)
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/* Use overlapping loads to avoid branches. */
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leaq -8(%rdi, %rdx), %rdi
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leaq -8(%rsi, %rdx), %rsi
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vmovq (%rdi), %xmm1
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vmovq (%rsi), %xmm2
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VPCMPEQ %xmm1, %xmm2, %xmm2
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vpmovmskb %xmm2, %eax
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subl $0xffff, %eax
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jnz L(first_vec)
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ret
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.p2align 4
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L(between_16_31):
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/* From 16 to 31 bytes. No branch when size == 16. */
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vmovdqu (%rsi), %xmm2
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VPCMPEQ (%rdi), %xmm2, %xmm2
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vpmovmskb %xmm2, %eax
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subl $0xffff, %eax
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jnz L(first_vec)
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/* Use overlapping loads to avoid branches. */
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leaq -16(%rdi, %rdx), %rdi
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leaq -16(%rsi, %rdx), %rsi
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vmovdqu (%rsi), %xmm2
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VPCMPEQ (%rdi), %xmm2, %xmm2
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vpmovmskb %xmm2, %eax
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subl $0xffff, %eax
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jnz L(first_vec)
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ret
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.p2align 4
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L(more_8x_vec):
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/* More than 8 * VEC. Check the first VEC. */
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vmovdqu (%rsi), %ymm2
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VPCMPEQ (%rdi), %ymm2, %ymm2
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vpmovmskb %ymm2, %eax
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subl $VEC_MASK, %eax
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jnz L(first_vec)
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/* Align the first memory area for aligned loads in the loop.
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Compute how much the first memory area is misaligned. */
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movq %rdi, %rcx
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andl $(VEC_SIZE - 1), %ecx
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/* Get the negative of offset for alignment. */
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subq $VEC_SIZE, %rcx
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/* Adjust the second memory area. */
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subq %rcx, %rsi
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/* Adjust the first memory area which should be aligned now. */
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subq %rcx, %rdi
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/* Adjust length. */
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addq %rcx, %rdx
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L(loop_4x_vec):
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/* Compare 4 * VEC at a time forward. */
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vmovdqu (%rsi), %ymm1
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VPCMPEQ (%rdi), %ymm1, %ymm1
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vmovdqu VEC_SIZE(%rsi), %ymm2
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VPCMPEQ VEC_SIZE(%rdi), %ymm2, %ymm2
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vpand %ymm2, %ymm1, %ymm5
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vmovdqu (VEC_SIZE * 2)(%rsi), %ymm3
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VPCMPEQ (VEC_SIZE * 2)(%rdi), %ymm3, %ymm3
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vpand %ymm3, %ymm5, %ymm5
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vmovdqu (VEC_SIZE * 3)(%rsi), %ymm4
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VPCMPEQ (VEC_SIZE * 3)(%rdi), %ymm4, %ymm4
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vpand %ymm4, %ymm5, %ymm5
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vptest %ymm0, %ymm5
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jnc L(4x_vec_end)
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addq $(VEC_SIZE * 4), %rdi
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addq $(VEC_SIZE * 4), %rsi
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subq $(VEC_SIZE * 4), %rdx
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cmpq $(VEC_SIZE * 4), %rdx
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jae L(loop_4x_vec)
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/* Less than 4 * VEC. */
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cmpq $VEC_SIZE, %rdx
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jbe L(last_vec)
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cmpq $(VEC_SIZE * 2), %rdx
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jbe L(last_2x_vec)
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L(last_4x_vec):
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/* From 2 * VEC to 4 * VEC. */
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vmovdqu (%rsi), %ymm2
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VPCMPEQ (%rdi), %ymm2, %ymm2
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vpmovmskb %ymm2, %eax
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subl $VEC_MASK, %eax
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jnz L(first_vec)
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addq $VEC_SIZE, %rdi
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addq $VEC_SIZE, %rsi
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vmovdqu (%rsi), %ymm2
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VPCMPEQ (%rdi), %ymm2, %ymm2
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vpmovmskb %ymm2, %eax
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subl $VEC_MASK, %eax
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jnz L(first_vec)
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/* Use overlapping loads to avoid branches. */
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leaq -(3 * VEC_SIZE)(%rdi, %rdx), %rdi
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leaq -(3 * VEC_SIZE)(%rsi, %rdx), %rsi
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vmovdqu (%rsi), %ymm2
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VPCMPEQ (%rdi), %ymm2, %ymm2
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vpmovmskb %ymm2, %eax
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subl $VEC_MASK, %eax
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jnz L(first_vec)
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addq $VEC_SIZE, %rdi
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addq $VEC_SIZE, %rsi
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vmovdqu (%rsi), %ymm2
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VPCMPEQ (%rdi), %ymm2, %ymm2
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vpmovmskb %ymm2, %eax
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subl $VEC_MASK, %eax
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jnz L(first_vec)
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VZEROUPPER
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ret
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.p2align 4
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L(4x_vec_end):
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vpmovmskb %ymm1, %eax
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subl $VEC_MASK, %eax
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jnz L(first_vec)
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vpmovmskb %ymm2, %eax
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subl $VEC_MASK, %eax
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jnz L(first_vec_x1)
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vpmovmskb %ymm3, %eax
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subl $VEC_MASK, %eax
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jnz L(first_vec_x2)
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vpmovmskb %ymm4, %eax
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subl $VEC_MASK, %eax
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tzcntl %eax, %ecx
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# ifdef USE_AS_WMEMCMP
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xorl %eax, %eax
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movl (VEC_SIZE * 3)(%rdi, %rcx), %edx
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cmpl (VEC_SIZE * 3)(%rsi, %rcx), %edx
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jmp L(wmemcmp_return)
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# else
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movzbl (VEC_SIZE * 3)(%rdi, %rcx), %eax
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movzbl (VEC_SIZE * 3)(%rsi, %rcx), %edx
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sub %edx, %eax
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# endif
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VZEROUPPER
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ret
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.p2align 4
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L(first_vec_x1):
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tzcntl %eax, %ecx
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# ifdef USE_AS_WMEMCMP
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xorl %eax, %eax
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movl VEC_SIZE(%rdi, %rcx), %edx
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cmpl VEC_SIZE(%rsi, %rcx), %edx
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jmp L(wmemcmp_return)
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# else
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movzbl VEC_SIZE(%rdi, %rcx), %eax
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movzbl VEC_SIZE(%rsi, %rcx), %edx
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sub %edx, %eax
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# endif
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VZEROUPPER
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ret
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.p2align 4
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L(first_vec_x2):
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tzcntl %eax, %ecx
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# ifdef USE_AS_WMEMCMP
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xorl %eax, %eax
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movl (VEC_SIZE * 2)(%rdi, %rcx), %edx
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cmpl (VEC_SIZE * 2)(%rsi, %rcx), %edx
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jmp L(wmemcmp_return)
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# else
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movzbl (VEC_SIZE * 2)(%rdi, %rcx), %eax
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movzbl (VEC_SIZE * 2)(%rsi, %rcx), %edx
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sub %edx, %eax
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# endif
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VZEROUPPER
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ret
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END (MEMCMP)
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#endif
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