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authorOndrej Bilka <neleai@seznam.cz>2013-03-18 07:39:12 +0100
committerOndrej Bilka <neleai@seznam.cz>2013-03-18 07:39:12 +0100
commit37bb363f03d75e5e6f2ca45f2c686a3a0167797e (patch)
treea50f6871e18f34cab50d770bcc730c53364850d5 /sysdeps/x86_64/strnlen.S
parentf816705060415c476d8a9a0cbb683dc7a5aeef8e (diff)
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Faster strlen on x64.
Diffstat (limited to 'sysdeps/x86_64/strnlen.S')
-rw-r--r--sysdeps/x86_64/strnlen.S67
1 files changed, 5 insertions, 62 deletions
diff --git a/sysdeps/x86_64/strnlen.S b/sysdeps/x86_64/strnlen.S
index 6e53503060..d3c43ac482 100644
--- a/sysdeps/x86_64/strnlen.S
+++ b/sysdeps/x86_64/strnlen.S
@@ -1,63 +1,6 @@
-/* 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.
+#define AS_STRNLEN
+#define strlen __strnlen
+#include "strlen.S"
 
-   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)
+weak_alias (__strnlen, strnlen);
+libc_hidden_builtin_def (strnlen)