2012-04-17 02:02:27 +00:00
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/* Optimized version of the standard strcpy() function.
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This file is part of the GNU C Library.
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2020-01-01 00:14:33 +00:00
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Copyright (C) 2000-2020 Free Software Foundation, Inc.
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2012-04-17 02:02:27 +00:00
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Contributed by Dan Pop <Dan.Pop@cern.ch>.
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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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2012-04-17 02:10:24 +00:00
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License along with the GNU C Library; if not, see
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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
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<https://www.gnu.org/licenses/>. */
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2012-04-17 02:02:27 +00:00
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/* Return: dest
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Inputs:
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in0: dest
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in1: src
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In this form, it assumes little endian mode. For big endian mode,
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the two shifts in .l2 must be inverted:
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shl value = r[1], sh1 // value = w0 << sh1
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shr.u tmp = r[0], sh2 // tmp = w1 >> sh2
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*/
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#include <sysdep.h>
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#undef ret
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#define saved_lc r15
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#define saved_pr r16
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#define thresh r17
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#define dest r19
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#define src r20
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#define len r21
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#define asrc r22
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#define tmp r23
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#define pos r24
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#define w0 r25
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#define w1 r26
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#define c r27
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#define sh2 r28
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#define sh1 r29
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#define loopcnt r30
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#define value r31
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ENTRY(strcpy)
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.prologue
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alloc r2 = ar.pfs, 2, 0, 30, 32
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#define MEMLAT 2
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.rotr r[MEMLAT + 2]
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.rotp p[MEMLAT + 1]
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mov ret0 = in0 // return value = dest
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.save pr, saved_pr
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mov saved_pr = pr // save the predicate registers
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.save ar.lc, saved_lc
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mov saved_lc = ar.lc // save the loop counter
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.body
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sub tmp = r0, in0 ;; // tmp = -dest
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mov dest = in0 // dest
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mov src = in1 // src
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and loopcnt = 7, tmp ;; // loopcnt = -dest % 8
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cmp.eq p6, p0 = loopcnt, r0
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adds loopcnt = -1, loopcnt // --loopcnt
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(p6) br.cond.sptk .dest_aligned ;;
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mov ar.lc = loopcnt
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.l1: // copy -dest % 8 bytes
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ld1 c = [src], 1 // c = *src++
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;;
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st1 [dest] = c, 1 // *dest++ = c
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cmp.eq p6, p0 = c, r0
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(p6) br.cond.dpnt .restore_and_exit
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br.cloop.dptk .l1 ;;
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.dest_aligned:
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and sh1 = 7, src // sh1 = src % 8
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mov ar.lc = -1 // "infinite" loop
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and asrc = -8, src ;; // asrc = src & -OPSIZ -- align src
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sub thresh = 8, sh1
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mov pr.rot = 1 << 16 // set rotating predicates
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cmp.ne p7, p0 = r0, r0 // clear p7
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shl sh1 = sh1, 3 ;; // sh1 = 8 * (src % 8)
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sub sh2 = 64, sh1 // sh2 = 64 - sh1
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cmp.eq p6, p0 = sh1, r0 // is the src aligned?
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(p6) br.cond.sptk .src_aligned ;;
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ld8 r[1] = [asrc],8 ;;
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.align 32
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.l2:
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ld8.s r[0] = [asrc], 8
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shr.u value = r[1], sh1 ;; // value = w0 >> sh1
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czx1.r pos = value ;; // do we have an "early" zero
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cmp.lt p7, p0 = pos, thresh // in w0 >> sh1?
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(p7) br.cond.dpnt .found0
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chk.s r[0], .recovery2 // it is safe to do that only
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.back2: // after the previous test
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shl tmp = r[0], sh2 // tmp = w1 << sh2
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;;
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or value = value, tmp ;; // value |= tmp
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czx1.r pos = value ;;
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cmp.ne p7, p0 = 8, pos
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(p7) br.cond.dpnt .found0
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st8 [dest] = value, 8 // store val to dest
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br.ctop.dptk .l2 ;;
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.src_aligned:
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.l3:
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(p[0]) ld8.s r[0] = [src], 8
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(p[MEMLAT]) chk.s r[MEMLAT], .recovery3
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.back3:
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(p[MEMLAT]) mov value = r[MEMLAT]
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(p[MEMLAT]) czx1.r pos = r[MEMLAT] ;;
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(p[MEMLAT]) cmp.ne p7, p0 = 8, pos
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(p7) br.cond.dpnt .found0
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(p[MEMLAT]) st8 [dest] = r[MEMLAT], 8
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br.ctop.dptk .l3 ;;
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.found0:
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mov ar.lc = pos
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.l4:
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extr.u c = value, 0, 8 // c = value & 0xff
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shr.u value = value, 8
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;;
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st1 [dest] = c, 1
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br.cloop.dptk .l4 ;;
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.restore_and_exit:
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mov ar.lc = saved_lc // restore the loop counter
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mov pr = saved_pr, -1 // restore the predicate registers
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br.ret.sptk.many b0
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.recovery2:
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add tmp = -8, asrc ;;
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ld8 r[0] = [tmp]
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br.cond.sptk .back2
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.recovery3:
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add tmp = -(MEMLAT + 1) * 8, src ;;
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ld8 r[MEMLAT] = [tmp]
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br.cond.sptk .back3
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END(strcpy)
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libc_hidden_builtin_def (strcpy)
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