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PATCH: Remove ENABLE_SSSE3_ON_ATOM
- From: "H.J. Lu" <hongjiu dot lu at intel dot com>
- To: GNU C Library <libc-alpha at sourceware dot org>
- Date: Thu, 27 Aug 2009 18:44:45 -0700
- Subject: PATCH: Remove ENABLE_SSSE3_ON_ATOM
- Reply-to: "H.J. Lu" <hjl dot tools at gmail dot com>
Hi,
It turns that SSSE3 isn't slow on Atom. The problem is bsf. This patch
removes ENABLE_SSSE3_ON_ATOM. I will submit another patch for Atom later.
Thanks.
H.J.
----
2009-08-27 H.J. Lu <hongjiu.lu@intel.com>
* sysdeps/i386/i686/multiarch/init-arch.c (ENABLE_SSSE3_ON_ATOM):
Removed.
* sysdeps/x86_64/multiarch/init-arch.c (__init_cpu_features): Don't
turn off SSSE3 on Atom.
diff --git a/sysdeps/i386/i686/multiarch/init-arch.c b/sysdeps/i386/i686/multiarch/init-arch.c
index b371bae..00a94d8 100644
--- a/sysdeps/i386/i686/multiarch/init-arch.c
+++ b/sysdeps/i386/i686/multiarch/init-arch.c
@@ -1,3 +1 @@
-#define ENABLE_SSSE3_ON_ATOM
-
#include <sysdeps/x86_64/multiarch/init-arch.c>
diff --git a/sysdeps/x86_64/multiarch/init-arch.c b/sysdeps/x86_64/multiarch/init-arch.c
index c152ab2..9a1e776 100644
--- a/sysdeps/x86_64/multiarch/init-arch.c
+++ b/sysdeps/x86_64/multiarch/init-arch.c
@@ -64,15 +64,7 @@ __init_cpu_features (void)
__cpu_features.model += extended_model;
}
else if (__cpu_features.family == 0x06)
- {
- __cpu_features.model += extended_model;
-
-#ifndef ENABLE_SSSE3_ON_ATOM
- if (__cpu_features.model == 0x1c)
- /* Avoid SSSE3 on Atom since it is slow. */
- __cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx &= ~(1 << 9);
-#endif
- }
+ __cpu_features.model += extended_model;
}
/* This spells out "AuthenticAMD". */
else if (ebx == 0x68747541 && ecx == 0x444d4163 && edx == 0x69746e65)