PATCH: Add __x86_64_data_cache_size

[H.J. Lu]

Hi,

We are working on the optimized 32bit and 64bit memset . We need the full
size of the first level cache.  Otherwise, we see 20% performance drop
vs. 15% performance gain around the the first level cache size on Intel
Atom.  This patch adds __x86_64_data_cache_size.

Thanks.


H.J.
---
2009-12-31  H.J. Lu  <hongjiu.lu@intel.com>

	* sysdeps/i386/i686/cacheinfo.c (__x86_64_data_cache_size): New.

	* sysdeps/x86_64/cacheinfo.c (__x86_64_data_cache_size): New.
	(init_cacheinfo): Set __x86_64_data_cache_size.

diff --git a/sysdeps/i386/i686/cacheinfo.c b/sysdeps/i386/i686/cacheinfo.c
index 82e4cd2..f8b7f52 100644
--- a/sysdeps/i386/i686/cacheinfo.c
+++ b/sysdeps/i386/i686/cacheinfo.c
@@ -1,3 +1,4 @@
+#define __x86_64_data_cache_size __x86_data_cache_size
 #define __x86_64_data_cache_size_half __x86_data_cache_size_half
 #define __x86_64_shared_cache_size __x86_shared_cache_size
 #define __x86_64_shared_cache_size_half __x86_shared_cache_size_half
diff --git a/sysdeps/x86_64/cacheinfo.c b/sysdeps/x86_64/cacheinfo.c
index 5b66c62..d586981 100644
--- a/sysdeps/x86_64/cacheinfo.c
+++ b/sysdeps/x86_64/cacheinfo.c
@@ -452,9 +452,10 @@ __cache_sysconf (int name)
 }
 
 
-/* Half the data cache size for use in memory and string routines, typically
+/* Data cache size for use in memory and string routines, typically
    L1 size.  */
 long int __x86_64_data_cache_size_half attribute_hidden = 32 * 1024 / 2;
+long int __x86_64_data_cache_size attribute_hidden = 32 * 1024;
 /* Shared cache size for use in memory and string routines, typically
    L2 or L3 size.  */
 long int __x86_64_shared_cache_size_half attribute_hidden = 1024 * 1024 / 2;
@@ -657,7 +658,10 @@ init_cacheinfo (void)
     }
 
   if (data > 0)
-    __x86_64_data_cache_size_half = data / 2;
+    {
+      __x86_64_data_cache_size_half = data / 2;
+      __x86_64_data_cache_size = data;
+    }
 
   if (shared > 0)
     {