Optimized strnlen and wcscmp for x86-64

1 files changed, 55 insertions, 0 deletions

diff --git a/sysdeps/x86_64/multiarch/strnlen.S b/sysdeps/x86_64/multiarch/strnlen.S
new file mode 100644
index 0000000000..75c9adfbcf
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/strnlen.S
@@ -0,0 +1,55 @@
+/* multiple version of strnlen
+   Copyright (C) 2011 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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 <sysdep.h>
+#include <init-arch.h>
+
+
+/* Define multiple versions only for the definition in libc.  */
+#ifndef NOT_IN_libc
+
+	.text
+ENTRY(__strnlen)
+	.type	__strnlen, @gnu_indirect_function
+	cmpl	$0, __cpu_features+KIND_OFFSET(%rip)
+	jne	1f
+	call	__init_cpu_features
+1:	leaq	__strnlen_sse2(%rip), %rax
+	testl	$bit_Slow_BSF, __cpu_features+FEATURE_OFFSET+index_Slow_BSF(%rip)
+	jz	2f
+	leaq	__strnlen_sse2_no_bsf(%rip), %rax
+2:	ret
+END(__strnlen)
+
+# undef ENTRY
+# define ENTRY(name) \
+	.type __strnlen_sse2, @function; \
+	.align 16; \
+	__strnlen_sse2: cfi_startproc; \
+	CALL_MCOUNT
+# undef END
+# define END(name) \
+	cfi_endproc; .size __strnlen_sse2, .-__strnlen_sse2
+
+# undef libc_hidden_def
+# define libc_hidden_def(name) \
+	.globl __GI_strnlen; __GI_strnlen = __strnlen_sse2
+#endif
+
+#include "../strnlen.S"