glibc/sysdeps/ia64/strncmp.S
Ulrich Drepper 5bfc425236 Update.
* sysdeps/ia64/memccpy.S: New file.
	* sysdeps/ia64/memchr.S: New file.
	* sysdeps/ia64/memcmp.S: New file.
	* sysdeps/ia64/memcpy.S: New file.
	* sysdeps/ia64/memmove.S: New file.
	* sysdeps/ia64/memset.S: New file.
	* sysdeps/ia64/strcat.S: New file.
	* sysdeps/ia64/strchr.S: New file.
	* sysdeps/ia64/strcmp.S: New file.
	* sysdeps/ia64/strcpy.S: New file.
	* sysdeps/ia64/strlen.S: New file.
	* sysdeps/ia64/strncmp.S: New file.
	* sysdeps/ia64/strncpy.S: New file.
	* sysdeps/ia64/softpipe.h: New file.
	Patches by Dan Pop <Dan.Pop@cern.ch>.

	* manual/memory.texi: Document memory handling functions (mlock,
	munlock, mlockall, munlockall, brk, and sbrk)
2000-05-21 22:04:15 +00:00

64 lines
1.8 KiB
ArmAsm

/* Optimized version of the standard strncmp() function.
This file is part of the GNU C Library.
Copyright (C) 2000 Free Software Foundation, Inc.
Contributed by Dan Pop <Dan.Pop@cern.ch>.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* Return: the result of the comparison
Inputs:
in0: s1
in1: s2
in2: n
Unlike memcmp(), this function is optimized for mismatches within the
first few characters. */
#include <sysdep.h>
#undef ret
#define s1 in0
#define s2 in1
#define n in2
#define saved_pfs r14
#define val1 r15
#define val2 r16
ENTRY(strncmp)
alloc saved_pfs = ar.pfs, 3, 0, 0, 0
mov ret0 = r0
cmp.eq p6, p0 = r0, r0 // set p6
cmp.eq p7, p0 = n, r0 // return immediately if n == 0
(p7) br.cond.spnt .restore_and_exit ;;
.loop:
ld1 val1 = [s1], 1
ld1 val2 = [s2], 1
adds n = -1, n // n--
;;
cmp.ne.and p6, p0 = val1, r0
cmp.ne.and p6, p0 = val2, r0
cmp.ne.and p6, p0 = n, r0
cmp.eq.and p6, p0 = val1, val2
(p6) br.cond.sptk .loop
sub ret0 = val1, val2
.restore_and_exit:
mov ar.pfs = saved_pfs
br.ret.sptk.many b0
END(strncmp)