mirror of
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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
268 lines
6.5 KiB
ArmAsm
268 lines
6.5 KiB
ArmAsm
/* Copyright (C) 2012-2019 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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*/
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#define dstin x0
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#define src x1
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#define count x2
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#define dst x3
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#define srcend x4
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#define dstend x5
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#define A_l x6
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#define A_lw w6
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#define A_h x7
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#define A_hw w7
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#define B_l x8
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#define B_lw w8
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#define B_h x9
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#define C_l x10
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#define C_h x11
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#define D_l x12
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#define D_h x13
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#define E_l src
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#define E_h count
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#define F_l srcend
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#define F_h dst
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#define G_l count
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#define G_h dst
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#define tmp1 x14
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/* Copies are split into 3 main cases: small copies of up to 16 bytes,
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medium copies of 17..96 bytes which are fully unrolled. Large copies
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of more than 96 bytes align the destination and use an unrolled loop
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processing 64 bytes per iteration.
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In order to share code with memmove, small and medium copies read all
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data before writing, allowing any kind of overlap. So small, medium
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and large backwards memmoves are handled by falling through into memcpy.
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Overlapping large forward memmoves use a loop that copies backwards.
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*/
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#ifndef MEMMOVE
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# define MEMMOVE memmove
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#endif
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#ifndef MEMCPY
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# define MEMCPY memcpy
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#endif
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ENTRY_ALIGN (MEMMOVE, 6)
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DELOUSE (0)
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DELOUSE (1)
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DELOUSE (2)
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sub tmp1, dstin, src
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cmp count, 96
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ccmp tmp1, count, 2, hi
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b.lo L(move_long)
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/* Common case falls through into memcpy. */
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END (MEMMOVE)
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libc_hidden_builtin_def (MEMMOVE)
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ENTRY (MEMCPY)
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DELOUSE (0)
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DELOUSE (1)
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DELOUSE (2)
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prfm PLDL1KEEP, [src]
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add srcend, src, count
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add dstend, dstin, count
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cmp count, 16
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b.ls L(copy16)
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cmp count, 96
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b.hi L(copy_long)
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/* Medium copies: 17..96 bytes. */
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sub tmp1, count, 1
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ldp A_l, A_h, [src]
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tbnz tmp1, 6, L(copy96)
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ldp D_l, D_h, [srcend, -16]
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tbz tmp1, 5, 1f
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ldp B_l, B_h, [src, 16]
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ldp C_l, C_h, [srcend, -32]
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stp B_l, B_h, [dstin, 16]
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stp C_l, C_h, [dstend, -32]
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1:
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stp A_l, A_h, [dstin]
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stp D_l, D_h, [dstend, -16]
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ret
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.p2align 4
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/* Small copies: 0..16 bytes. */
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L(copy16):
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cmp count, 8
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b.lo 1f
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ldr A_l, [src]
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ldr A_h, [srcend, -8]
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str A_l, [dstin]
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str A_h, [dstend, -8]
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ret
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.p2align 4
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1:
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tbz count, 2, 1f
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ldr A_lw, [src]
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ldr A_hw, [srcend, -4]
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str A_lw, [dstin]
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str A_hw, [dstend, -4]
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ret
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/* Copy 0..3 bytes. Use a branchless sequence that copies the same
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byte 3 times if count==1, or the 2nd byte twice if count==2. */
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1:
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cbz count, 2f
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lsr tmp1, count, 1
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ldrb A_lw, [src]
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ldrb A_hw, [srcend, -1]
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ldrb B_lw, [src, tmp1]
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strb A_lw, [dstin]
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strb B_lw, [dstin, tmp1]
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strb A_hw, [dstend, -1]
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2: ret
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.p2align 4
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/* Copy 64..96 bytes. Copy 64 bytes from the start and
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32 bytes from the end. */
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L(copy96):
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ldp B_l, B_h, [src, 16]
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ldp C_l, C_h, [src, 32]
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ldp D_l, D_h, [src, 48]
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ldp E_l, E_h, [srcend, -32]
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ldp F_l, F_h, [srcend, -16]
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stp A_l, A_h, [dstin]
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stp B_l, B_h, [dstin, 16]
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stp C_l, C_h, [dstin, 32]
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stp D_l, D_h, [dstin, 48]
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stp E_l, E_h, [dstend, -32]
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stp F_l, F_h, [dstend, -16]
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ret
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/* Align DST to 16 byte alignment so that we don't cross cache line
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boundaries on both loads and stores. There are at least 96 bytes
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to copy, so copy 16 bytes unaligned and then align. The loop
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copies 64 bytes per iteration and prefetches one iteration ahead. */
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.p2align 4
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L(copy_long):
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and tmp1, dstin, 15
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bic dst, dstin, 15
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ldp D_l, D_h, [src]
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sub src, src, tmp1
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add count, count, tmp1 /* Count is now 16 too large. */
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ldp A_l, A_h, [src, 16]
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stp D_l, D_h, [dstin]
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ldp B_l, B_h, [src, 32]
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ldp C_l, C_h, [src, 48]
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ldp D_l, D_h, [src, 64]!
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subs count, count, 128 + 16 /* Test and readjust count. */
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b.ls L(last64)
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L(loop64):
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stp A_l, A_h, [dst, 16]
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ldp A_l, A_h, [src, 16]
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stp B_l, B_h, [dst, 32]
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ldp B_l, B_h, [src, 32]
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stp C_l, C_h, [dst, 48]
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ldp C_l, C_h, [src, 48]
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stp D_l, D_h, [dst, 64]!
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ldp D_l, D_h, [src, 64]!
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subs count, count, 64
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b.hi L(loop64)
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/* Write the last full set of 64 bytes. The remainder is at most 64
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bytes, so it is safe to always copy 64 bytes from the end even if
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there is just 1 byte left. */
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L(last64):
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ldp E_l, E_h, [srcend, -64]
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stp A_l, A_h, [dst, 16]
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ldp A_l, A_h, [srcend, -48]
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stp B_l, B_h, [dst, 32]
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ldp B_l, B_h, [srcend, -32]
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stp C_l, C_h, [dst, 48]
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ldp C_l, C_h, [srcend, -16]
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stp D_l, D_h, [dst, 64]
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stp E_l, E_h, [dstend, -64]
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stp A_l, A_h, [dstend, -48]
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stp B_l, B_h, [dstend, -32]
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stp C_l, C_h, [dstend, -16]
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ret
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.p2align 4
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L(move_long):
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cbz tmp1, 3f
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add srcend, src, count
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add dstend, dstin, count
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/* Align dstend to 16 byte alignment so that we don't cross cache line
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boundaries on both loads and stores. There are at least 96 bytes
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to copy, so copy 16 bytes unaligned and then align. The loop
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copies 64 bytes per iteration and prefetches one iteration ahead. */
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and tmp1, dstend, 15
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ldp D_l, D_h, [srcend, -16]
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sub srcend, srcend, tmp1
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sub count, count, tmp1
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ldp A_l, A_h, [srcend, -16]
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stp D_l, D_h, [dstend, -16]
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ldp B_l, B_h, [srcend, -32]
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ldp C_l, C_h, [srcend, -48]
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ldp D_l, D_h, [srcend, -64]!
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sub dstend, dstend, tmp1
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subs count, count, 128
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b.ls 2f
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nop
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1:
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stp A_l, A_h, [dstend, -16]
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ldp A_l, A_h, [srcend, -16]
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stp B_l, B_h, [dstend, -32]
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ldp B_l, B_h, [srcend, -32]
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stp C_l, C_h, [dstend, -48]
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ldp C_l, C_h, [srcend, -48]
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stp D_l, D_h, [dstend, -64]!
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ldp D_l, D_h, [srcend, -64]!
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subs count, count, 64
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b.hi 1b
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/* Write the last full set of 64 bytes. The remainder is at most 64
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bytes, so it is safe to always copy 64 bytes from the start even if
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there is just 1 byte left. */
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2:
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ldp G_l, G_h, [src, 48]
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stp A_l, A_h, [dstend, -16]
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ldp A_l, A_h, [src, 32]
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stp B_l, B_h, [dstend, -32]
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ldp B_l, B_h, [src, 16]
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stp C_l, C_h, [dstend, -48]
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ldp C_l, C_h, [src]
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stp D_l, D_h, [dstend, -64]
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stp G_l, G_h, [dstin, 48]
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stp A_l, A_h, [dstin, 32]
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stp B_l, B_h, [dstin, 16]
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stp C_l, C_h, [dstin]
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3: ret
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END (MEMCPY)
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libc_hidden_builtin_def (MEMCPY)
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