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[PATCH] x86-64: Implement wcscpy IFUNC selector in C
- From: "H.J. Lu" <hongjiu dot lu at intel dot com>
- To: GNU C Library <libc-alpha at sourceware dot org>
- Date: Mon, 12 Jun 2017 09:11:34 -0700
- Subject: [PATCH] x86-64: Implement wcscpy IFUNC selector in C
- Authentication-results: sourceware.org; auth=none
- Reply-to: "H.J. Lu" <hjl dot tools at gmail dot com>
Any comments?
H.J.
* sysdeps/x86_64/multiarch/wcscpy.S: Removed.
* sysdeps/x86_64/multiarch/wcscpy.c: New file.
---
sysdeps/x86_64/multiarch/{wcscpy.S => wcscpy.c} | 37 ++++++++++++++-----------
1 file changed, 21 insertions(+), 16 deletions(-)
rename sysdeps/x86_64/multiarch/{wcscpy.S => wcscpy.c} (59%)
diff --git a/sysdeps/x86_64/multiarch/wcscpy.S b/sysdeps/x86_64/multiarch/wcscpy.c
similarity index 59%
rename from sysdeps/x86_64/multiarch/wcscpy.S
rename to sysdeps/x86_64/multiarch/wcscpy.c
index 9150ab6..104ee00 100644
--- a/sysdeps/x86_64/multiarch/wcscpy.S
+++ b/sysdeps/x86_64/multiarch/wcscpy.c
@@ -1,6 +1,6 @@
-/* Multiple versions of wcscpy
+/* Multiple versions of wcscpy.
All versions must be listed in ifunc-impl-list.c.
- Copyright (C) 2011-2017 Free Software Foundation, Inc.
+ Copyright (C) 2017 Free Software Foundation, Inc.
Contributed by Intel Corporation.
This file is part of the GNU C Library.
@@ -18,23 +18,28 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
-#include <sysdep.h>
-#include <init-arch.h>
-
/* Define multiple versions only for the definition in libc. */
#if IS_IN (libc)
+# define wcscpy __redirect_wcscpy
+# include <wchar.h>
+# undef wcscpy
+
+# define SYMBOL_NAME wcscpy
+# include <init-arch.h>
+
+extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2) attribute_hidden;
+extern __typeof (REDIRECT_NAME) OPTIMIZE (ssse3) attribute_hidden;
+
+static inline void *
+IFUNC_SELECTOR (void)
+{
+ const struct cpu_features* cpu_features = __get_cpu_features ();
- .text
-ENTRY(wcscpy)
- .type wcscpy, @gnu_indirect_function
- LOAD_RTLD_GLOBAL_RO_RDX
- HAS_CPU_FEATURE (SSSE3)
- jnz 2f
- leaq __wcscpy_sse2(%rip), %rax
- ret
+ if (CPU_FEATURES_CPU_P (cpu_features, SSSE3))
+ return OPTIMIZE (ssse3);
-2: leaq __wcscpy_ssse3(%rip), %rax
- ret
+ return OPTIMIZE (sse2);
+}
-END(wcscpy)
+libc_ifunc_redirected (__redirect_wcscpy, wcscpy, IFUNC_SELECTOR ());
#endif
--
2.9.4