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-rw-r--r--libc/string/ia64/strncmp.S62
1 files changed, 62 insertions, 0 deletions
diff --git a/libc/string/ia64/strncmp.S b/libc/string/ia64/strncmp.S
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+++ b/libc/string/ia64/strncmp.S
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+/* Optimized version of the standard strncmp() function.
+ This file is part of the GNU C Library.
+ Copyright (C) 2000, 2001, 2003 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 Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; 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 val1 r15
+#define val2 r16
+
+
+ENTRY(strncmp)
+ alloc r2 = 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:
+ br.ret.sptk.many b0
+END(strncmp)
+libc_hidden_def (strncmp)