Optimized st{r,p}{,n}cpy for SSE2/SSSE3 on x86-32

1 files changed, 154 insertions, 0 deletions

diff --git a/sysdeps/i386/i686/multiarch/strcpy.S b/sysdeps/i386/i686/multiarch/strcpy.S
new file mode 100644
index 0000000..d025a4f
--- /dev/null
+++ b/sysdeps/i386/i686/multiarch/strcpy.S
@@ -0,0 +1,154 @@
+/* Multiple versions of strcpy
+   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>
+
+#if !defined (USE_AS_STPCPY) && !defined (USE_AS_STRNCPY)
+# ifndef STRCPY
+#  define STRCPY strcpy
+# endif
+#endif
+
+#ifdef USE_AS_STPCPY
+# ifdef USE_AS_STRNCPY
+#  define STRCPY_SSSE3	__stpncpy_ssse3
+#  define STRCPY_SSE2		__stpncpy_sse2
+#  define STRCPY_IA32		__stpncpy_ia32
+#  define __GI_STRCPY		__GI_stpncpy
+#  define __GI___STRCPY		__GI___stpncpy
+# else
+#  define STRCPY_SSSE3	__stpcpy_ssse3
+#  define STRCPY_SSE2		__stpcpy_sse2
+#  define STRCPY_IA32		__stpcpy_ia32
+#  define __GI_STRCPY		__GI_stpcpy
+#  define __GI___STRCPY		__GI___stpcpy
+# endif
+#else
+# ifdef USE_AS_STRNCPY
+#  define STRCPY_SSSE3	__strncpy_ssse3
+#  define STRCPY_SSE2		__strncpy_sse2
+#  define STRCPY_IA32		__strncpy_ia32
+#  define __GI_STRCPY		__GI_strncpy
+# else
+#  define STRCPY_SSSE3	__strcpy_ssse3
+#  define STRCPY_SSE2		__strcpy_sse2
+#  define STRCPY_IA32		__strcpy_ia32
+#  define __GI_STRCPY		__GI_strcpy
+# endif
+#endif
+
+
+/* Define multiple versions only for the definition in libc.  Don't
+   define multiple versions for strncpy in static library since we
+   need strncpy before the initialization happened.  */
+#ifndef NOT_IN_libc
+
+# ifdef SHARED
+	.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
+
+	.text
+ENTRY(STRCPY)
+	.type	STRCPY, @gnu_indirect_function
+	pushl	%ebx
+	cfi_adjust_cfa_offset (4)
+	cfi_rel_offset (ebx, 0)
+	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:	leal	STRCPY_IA32@GOTOFF(%ebx), %eax
+	testl	$bit_SSE2, CPUID_OFFSET+index_SSE2+__cpu_features@GOTOFF(%ebx)
+	jz	2f
+	leal	STRCPY_SSE2@GOTOFF(%ebx), %eax
+	testl	$bit_Fast_Unaligned_Load, FEATURE_OFFSET+index_Fast_Unaligned_Load+__cpu_features@GOTOFF(%ebx)
+	jnz	2f
+	testl	$bit_SSSE3, CPUID_OFFSET+index_SSSE3+__cpu_features@GOTOFF(%ebx)
+	jz	2f
+	leal	STRCPY_SSSE3@GOTOFF(%ebx), %eax
+2:	popl	%ebx
+	cfi_adjust_cfa_offset (-4)
+	cfi_restore (ebx)
+	ret
+END(STRCPY)
+# else
+
+ENTRY(STRCPY)
+	.type	STRCPY, @gnu_indirect_function
+	cmpl	$0, KIND_OFFSET+__cpu_features
+	jne	1f
+	call	__init_cpu_features
+1:	leal	STRCPY_IA32, %eax
+	testl	$bit_SSE2, CPUID_OFFSET+index_SSE2+__cpu_features
+	jz	2f
+	leal	STRCPY_SSE2, %eax
+	testl	$bit_Fast_Unaligned_Load, FEATURE_OFFSET+index_Fast_Unaligned_Load+__cpu_features
+	jnz	2f
+	testl	$bit_SSSE3, CPUID_OFFSET+index_SSSE3+__cpu_features
+	jz	2f
+	leal	STRCPY_SSSE3, %eax
+2:	ret
+END(STRCPY)
+
+# endif
+
+# undef ENTRY
+# define ENTRY(name) \
+	.type STRCPY_IA32, @function; \
+	.align 16; \
+	STRCPY_IA32: cfi_startproc; \
+	CALL_MCOUNT
+# undef END
+# define END(name) \
+	cfi_endproc; .size STRCPY_IA32, .-STRCPY_IA32
+
+# ifdef SHARED
+#  undef libc_hidden_builtin_def
+/* It doesn't make sense to send libc-internal strcpy calls through a PLT.
+   The speedup we get from using SSSE3 instruction is likely eaten away
+   by the indirect call in the PLT.  */
+#  define libc_hidden_builtin_def(name) \
+	.globl __GI_STRCPY; __GI_STRCPY = STRCPY_IA32
+#  undef libc_hidden_def
+#  define libc_hidden_def(name) \
+	.globl __GI___STRCPY; __GI___STRCPY = STRCPY_IA32
+
+# endif
+#endif
+
+#ifdef USE_AS_STPCPY
+# ifdef USE_AS_STRNCPY
+#  include "../../stpncpy.S"
+# else
+#  include "../../i586/stpcpy.S"
+# endif
+#else
+# ifndef USE_AS_STRNCPY
+#  include "../../i586/strcpy.S"
+# endif
+#endif