Revert " * sysdeps/x86_64/strlen.S: Replace with new SSE2 based implementation"

This reverts commit b79188d71716b6286866e06add976fe84100595e.

1 files changed, 62 insertions, 5 deletions

diff --git a/sysdeps/x86_64/strnlen.S b/sysdeps/x86_64/strnlen.S
index d3c43ac482..6e53503060 100644
--- a/sysdeps/x86_64/strnlen.S
+++ b/sysdeps/x86_64/strnlen.S
@@ -1,6 +1,63 @@
-#define AS_STRNLEN
-#define strlen __strnlen
-#include "strlen.S"
+/* strnlen(str,maxlen) -- determine the length of the string STR up to MAXLEN.
+   Copyright (C) 2010-2013 Free Software Foundation, Inc.
+   Contributed by Ulrich Drepper <drepper@redhat.com>.
+   This file is part of the GNU C Library.
 
-weak_alias (__strnlen, strnlen);
-libc_hidden_builtin_def (strnlen)
+   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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sysdep.h>
+
+
+	.text
+ENTRY(__strnlen)
+	movq	%rsi, %rax
+	testq	%rsi, %rsi
+	jz	3f
+	pxor	%xmm2, %xmm2
+	movq	%rdi, %rcx
+	movq	%rdi, %r8
+	movq	$16, %r9
+	andq	$~15, %rdi
+	movdqa	%xmm2, %xmm1
+	pcmpeqb	(%rdi), %xmm2
+	orl	$0xffffffff, %r10d
+	subq	%rdi, %rcx
+	shll	%cl, %r10d
+	subq	%rcx, %r9
+	pmovmskb %xmm2, %edx
+	andl	%r10d, %edx
+	jnz	1f
+	subq	%r9, %rsi
+	jbe	3f
+
+2:	movdqa	16(%rdi), %xmm0
+	leaq	16(%rdi), %rdi
+	pcmpeqb	%xmm1, %xmm0
+	pmovmskb %xmm0, %edx
+	testl	%edx, %edx
+	jnz	1f
+	subq	$16, %rsi
+	jnbe	2b
+3:	ret
+
+1:	subq	%r8, %rdi
+	bsfl	%edx, %edx
+	addq	%rdi, %rdx
+	cmpq	%rdx, %rax
+	cmovnbq	%rdx, %rax
+	ret
+END(__strnlen)
+weak_alias (__strnlen, strnlen)
+libc_hidden_def (strnlen)