summaryrefslogtreecommitdiff
path: root/libc/string/x86_64/strcmp.S
diff options
context:
space:
mode:
Diffstat (limited to 'libc/string/x86_64/strcmp.S')
-rw-r--r--libc/string/x86_64/strcmp.S41
1 files changed, 41 insertions, 0 deletions
diff --git a/libc/string/x86_64/strcmp.S b/libc/string/x86_64/strcmp.S
new file mode 100644
index 000000000..0b401a773
--- /dev/null
+++ b/libc/string/x86_64/strcmp.S
@@ -0,0 +1,41 @@
+/* Highly optimized version for x86-64.
+ Copyright (C) 1999, 2000, 2002, 2003, 2005 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Based on i686 version contributed by Ulrich Drepper
+ <drepper@cygnus.com>, 1999.
+
+ 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. */
+
+#include "_glibc_inc.h"
+
+ .text
+ENTRY (BP_SYM (strcmp))
+L(oop): movb (%rdi), %al
+ cmpb (%rsi), %al
+ jne L(neq)
+ incq %rdi
+ incq %rsi
+ testb %al, %al
+ jnz L(oop)
+
+ xorl %eax, %eax
+ ret
+
+L(neq): movl $1, %eax
+ movl $-1, %ecx
+ cmovbl %ecx, %eax
+ ret
+END (BP_SYM (strcmp))