56 lines
1.6 KiB
ArmAsm
56 lines
1.6 KiB
ArmAsm
/* Optimized version of the standard strcmp() function.
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This file is part of the GNU C Library.
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Copyright (C) 2000 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* Return: the result of the comparison
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Inputs:
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in0: s1
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in1: s2
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Unlike memcmp(), this function is optimized for mismatches within the
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first few characters. */
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#include <sysdep.h>
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#undef ret
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#define s1 in0
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#define s2 in1
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#define saved_pfs r14
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#define val1 r15
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#define val2 r16
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ENTRY(strcmp)
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alloc saved_pfs = ar.pfs, 2, 0, 0, 0
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.loop:
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ld1 val1 = [s1], 1
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ld1 val2 = [s2], 1
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cmp.eq p6, p0 = r0, r0 // set p6
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;;
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cmp.ne.and p6, p0 = val1, r0
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cmp.ne.and p6, p0 = val2, r0
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cmp.eq.and p6, p0 = val1, val2
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(p6) br.cond.sptk .loop
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sub ret0 = val1, val2
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mov ar.pfs = saved_pfs
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br.ret.sptk.many b0
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END(strcmp)
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