From 06e51c8f3de38761f8855700841bc49cf495c8c0 Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hongjiu.lu@intel.com>
Date: Fri, 3 Jul 2009 02:48:56 -0700
Subject: Add SSE4.2 support for strcspn, strpbrk, and strspn on x86-64.

---
 sysdeps/x86_64/multiarch/strcspn.S | 82 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 sysdeps/x86_64/multiarch/strcspn.S

(limited to 'sysdeps/x86_64/multiarch/strcspn.S')

diff --git a/sysdeps/x86_64/multiarch/strcspn.S b/sysdeps/x86_64/multiarch/strcspn.S
new file mode 100644
index 0000000000..cc75ab70e6
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/strcspn.S
@@ -0,0 +1,82 @@
+/* Multiple versions of strcspn
+   Copyright (C) 2009 Free Software Foundation, Inc.
+   Contributed by Intel Corporation.
+   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 <config.h>
+
+#ifdef HAVE_SSE4_SUPPORT
+
+#include <sysdep.h>
+#include <ifunc-defines.h>
+
+#ifdef USE_AS_STRPBRK
+#define STRCSPN_SSE42	__strpbrk_sse42
+#define STRCSPN_SSE2	__strpbrk_sse2
+#define __GI_STRCSPN	__GI_strpbrk
+#else
+#ifndef STRCSPN
+#define STRCSPN		strcspn
+#define STRCSPN_SSE42	__strcspn_sse42
+#define STRCSPN_SSE2	__strcspn_sse2
+#define __GI_STRCSPN	__GI_strcspn
+#endif
+#endif
+
+/* Define multiple versions only for the definition in libc.  Don't
+   define multiple versions for strpbrk in static library since we
+   need strpbrk before the initialization happened.  */
+#if (defined SHARED || !defined USE_AS_STRPBRK) && !defined NOT_IN_libc
+	.text
+ENTRY(STRCSPN)
+	.type	STRCSPN, @gnu_indirect_function
+	cmpl	$0, __cpu_features+KIND_OFFSET(%rip)
+	jne	1f
+	call	__init_cpu_features
+1:	leaq	STRCSPN_SSE2(%rip), %rax
+	testl	$(1<<20), __cpu_features+CPUID_OFFSET+COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET(%rip)
+	jz	2f
+	leaq	STRCSPN_SSE42(%rip), %rax
+2:	ret
+END(STRCSPN)
+
+# undef ENTRY
+# define ENTRY(name) \
+	.type STRCSPN_SSE2, @function; \
+	.globl STRCSPN_SSE2; \
+	.align 16; \
+	STRCSPN_SSE2: cfi_startproc; \
+	CALL_MCOUNT
+# undef END
+# define END(name) \
+	cfi_endproc; .size STRCSPN_SSE2, .-STRCSPN_SSE2
+# undef libc_hidden_builtin_def
+/* It doesn't make sense to send libc-internal strcspn calls through a PLT.
+   The speedup we get from using SSE4.2 instruction is likely eaten away
+   by the indirect call in the PLT.  */
+# define libc_hidden_builtin_def(name) \
+	.globl __GI_STRCSPN; __GI_STRCSPN = STRCSPN_SSE2
+#endif
+
+#endif /* HAVE_SSE4_SUPPORT */
+
+#ifdef USE_AS_STRPBRK
+#include "../strpbrk.S"
+#else
+#include "../strcspn.S"
+#endif
-- 
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