diff options
Diffstat (limited to 'sysdeps/ia64/strcmp.S')
| -rw-r--r-- | sysdeps/ia64/strcmp.S | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/sysdeps/ia64/strcmp.S b/sysdeps/ia64/strcmp.S new file mode 100644 index 0000000000..164dd1bd7f --- /dev/null +++ b/sysdeps/ia64/strcmp.S @@ -0,0 +1,55 @@ +/* Optimized version of the standard strcmp() 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 + + 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 saved_pfs r14 +#define val1 r15 +#define val2 r16 + + +ENTRY(strcmp) + alloc saved_pfs = ar.pfs, 2, 0, 0, 0 +.loop: + ld1 val1 = [s1], 1 + ld1 val2 = [s2], 1 + cmp.eq p6, p0 = r0, r0 // set p6 + ;; + cmp.ne.and p6, p0 = val1, r0 + cmp.ne.and p6, p0 = val2, r0 + cmp.eq.and p6, p0 = val1, val2 +(p6) br.cond.sptk .loop + sub ret0 = val1, val2 + mov ar.pfs = saved_pfs + br.ret.sptk.many b0 +END(strcmp) |