4dbb64174c
2001-07-06 Jakub Jelinek <jakub@redhat.com> * sysdeps/unix/sysv/linux/i386/sigaction.c (RESTORE2): Put asm explicitly into .text section. 2001-04-16 Jes Sorensen <jes@linuxcare.com> * sysdeps/unix/sysv/linux/ia64/bits/sigcontext.h (struct sigcontext): Add 16 longwords reserved for future use to match changes in the kernel. 2001-07-03 Jes Sorensen <jes@trained-monkey.org> * sysdeps/ia64/strncpy.S: Call strnlen() when determining the string length rather than strlen(). Solves the performance problem of doing strlen on a 5MB string when strncpy was called with a length argument of 5 bytes. 2001-07-02 Jakub Jelinek <jakub@redhat.com> * sysdeps/sparc/sparc32/dl-machine.h (elf_machine_rela): Handle R_SPARC_UA16 and R_SPARC_UA32. * sysdeps/sparc/sparc64/dl-machine.h (elf_machine_rela): Likewise. 2001-07-01 Stephen L Moshier <moshier@mediaone.net> * sysdeps/ieee754/ldbl-96/e_acoshl.c (__ieee754_acoshl): acosh(x) = ln(2x) if x > 2^30. * sysdeps/ieee754/ldbl-128/e_acoshl.c (__ieee754_acoshl): acosh(x) = ln(2x) if x > 2^54. * sysdeps/hppa/dl-machine.h (elf_machine_rela): Handle relocs
101 lines
2.8 KiB
ArmAsm
101 lines
2.8 KiB
ArmAsm
/* Optimized version of the standard strncpy() function.
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This file is part of the GNU C Library.
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Copyright (C) 2000, 2001 Free Software Foundation, Inc.
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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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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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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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in2: char count
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If n >= 24, do a memcpy(dest, src, min(strnlen(src, n)+1, n)), followed by a
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memset(dest + strlen(src, n), 0, n - strlen(src, n) - 1) if necessary.
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Otherwise, copy characters one by one and fill with nulls if necessary. */
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#include <sysdep.h>
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#undef ret
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#define saved_b0 loc0
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#define saved_pfs loc1
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#define saved_pr loc2
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#define saved_lc loc3
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#define tmp loc4
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#define len loc5
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#define dest in0
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#define src in1
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#define n in2
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#define rc ret0
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ENTRY(strncpy)
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.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(3)
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alloc saved_pfs = ar.pfs, 3, 6, 3, 0
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mov saved_b0 = b0
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.save pr, saved_pr
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mov saved_pr = pr
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.save ar.lc, saved_lc
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mov saved_lc = ar.lc
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.body
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cmp.gtu p6, p0 = 24, n
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(p6) br.cond.spnt .cpyfew
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mov out0 = src
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mov out1 = n
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mov tmp = gp
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br.call.sptk.many b0 = strnlen# ;; // rc = strnlen(src, n);
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add len = 1, rc // include the null in len
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mov gp = tmp
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mov out0 = dest ;;
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cmp.ltu p4, p5 = len, n
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mov out1 = src ;;
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(p4) mov out2 = len
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(p5) mov out2 = n
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br.call.sptk.many b0 = memcpy# ;; // memcpy(dest, src, min(len, n));
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mov gp = tmp
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(p4) add out0 = dest, len
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(p4) mov out1 = r0
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(p4) sub out2 = n, len
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(p4) br.call.sptk.many b0 = memset# ;; // fill the rest with nulls
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(p4) mov gp = tmp
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mov rc = dest
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mov b0 = saved_b0
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mov ar.pfs = saved_pfs
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mov pr = saved_pr, -1
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br.ret.sptk.many b0
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.cpyfew:
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mov rc = dest
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cmp.eq p6, p0 = n, r0
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adds n = -1, n
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(p6) br.cond.spnt .restore_and_exit ;; // do nothing if n == 0
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mov ar.lc = n
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cmp.eq p6, p0 = r0, r0 ;; // set p6
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.loop:
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(p6) ld1 tmp = [src],1
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;;
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st1 [dest] = tmp, 1
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(p6) cmp.ne p6, p0 = tmp, r0 // clear p6 after encountering the
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br.cloop.dptk .loop ;; // null character in src
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.restore_and_exit:
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mov ar.lc = saved_lc
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mov ar.pfs = saved_pfs
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br.ret.sptk.many b0
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END(strncpy)
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