From 951fbcec70e65c49705fcdbf4630bee5ce2a5691 Mon Sep 17 00:00:00 2001
From: Liubov Dmitrieva <liubov.dmitrieva@gmail.com>
Date: Wed, 12 Oct 2011 11:42:04 -0400
Subject: Optimized memchr, memrchr, rawmemchr for x86-32

---
 sysdeps/i386/i686/multiarch/memchr.S | 99 ++++++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 sysdeps/i386/i686/multiarch/memchr.S

(limited to 'sysdeps/i386/i686/multiarch/memchr.S')

diff --git a/sysdeps/i386/i686/multiarch/memchr.S b/sysdeps/i386/i686/multiarch/memchr.S
new file mode 100644
index 0000000000..163a83e17b
--- /dev/null
+++ b/sysdeps/i386/i686/multiarch/memchr.S
@@ -0,0 +1,99 @@
+/* Multiple versions of memchr
+   Copyright (C) 2011 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 <sysdep.h>
+#include <init-arch.h>
+
+#ifndef  NOT_IN_libc
+	.section	.gnu.linkonce.t.__i686.get_pc_thunk.bx,"ax",@progbits
+	.globl	__i686.get_pc_thunk.bx
+	.hidden	__i686.get_pc_thunk.bx
+	.p2align 4
+	.type	__i686.get_pc_thunk.bx,@function
+__i686.get_pc_thunk.bx:
+	movl	(%esp), %ebx
+	ret
+
+# define CFI_POP(REG) \
+	cfi_adjust_cfa_offset (-4); \
+	cfi_restore (REG)
+
+# define CFI_PUSH(REG) \
+	cfi_adjust_cfa_offset (4); \
+	cfi_rel_offset (REG, 0)
+
+	.text
+ENTRY(__memchr)
+	.type	__memchr, @gnu_indirect_function
+	pushl	%ebx
+	CFI_PUSH (%ebx)
+	call	__i686.get_pc_thunk.bx
+	addl	$_GLOBAL_OFFSET_TABLE_, %ebx
+	cmpl	$0, KIND_OFFSET+__cpu_features@GOTOFF(%ebx)
+	jne	1f
+	call	__init_cpu_features
+
+1:	testl	$bit_SSE2, CPUID_OFFSET+index_SSE2+__cpu_features@GOTOFF(%ebx)
+	jz	2f
+	testl	$bit_Slow_BSF, FEATURE_OFFSET+index_Slow_BSF+__cpu_features@GOTOFF(%ebx)
+	jz	3f
+
+	leal	__memchr_sse2@GOTOFF(%ebx), %eax
+	popl	%ebx
+	CFI_POP	(%ebx)
+	ret
+
+	CFI_PUSH (%ebx)
+
+2:	leal	__memchr_ia32@GOTOFF(%ebx), %eax
+	popl	%ebx
+	CFI_POP	(%ebx)
+	ret
+
+	CFI_PUSH (%ebx)
+
+3:	leal	__memchr_sse2_bsf@GOTOFF(%ebx), %eax
+	popl	%ebx
+	CFI_POP	(%ebx)
+	ret
+END(__memchr)
+
+weak_alias(__memchr, memchr)
+
+# undef ENTRY
+# define ENTRY(name) \
+	.type __memchr_ia32, @function; \
+	.globl __memchr_ia32; \
+	.p2align 4; \
+	__memchr_ia32: cfi_startproc; \
+	CALL_MCOUNT
+# undef END
+# define END(name) \
+	cfi_endproc; .size __memchr_ia32, .-__memchr_ia32
+
+# undef libc_hidden_builtin_def
+/* IFUNC doesn't work with the hidden functions in shared library since
+   they will be called without setting up EBX needed for PLT which is
+   used by IFUNC.  */
+# define libc_hidden_builtin_def(name) \
+	.globl __GI_memchr; __GI_memchr = __memchr_ia32
+
+#endif
+#include "../../memchr.S"
-- 
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