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GNU C Library master sources branch master updated. glibc-2.17-811-gd086fc7
- From: aj at sourceware dot org
- To: glibc-cvs at sourceware dot org
- Date: 14 Jun 2013 18:48:01 -0000
- Subject: GNU C Library master sources branch master updated. glibc-2.17-811-gd086fc7
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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=d086fc7ba0d4b58c9db901780cb8adf415e1f2b5
commit d086fc7ba0d4b58c9db901780cb8adf415e1f2b5
Author: Liubov Dmitrieva <liubov.dmitrieva@intel.com>
Date: Fri Jun 14 20:46:15 2013 +0200
Set fast unaligned load flag for new Intel microarchitecture
I have small patch for new Intel Silvermont machines.
http://newsroom.intel.com/community/intel_newsroom/blog/2013/05/06/intel-launches-low-power-high-performance-silvermont-microarchitecture
I checked this on my machine and see that strcpy, ... unaligned
versions are faster than ssse3 versions.
diff --git a/ChangeLog b/ChangeLog
index 77ac803..86d98f7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2013-06-14 Liubov Dmitrieva <liubov.dmitrieva@intel.com>
+
+ * sysdeps/x86_64/multiarch/init-arch.c (__init_cpu_features):
+ Set bit_Fast_Unaligned_Load for Intel Silvermont architecture.
+
2013-06-14 Siddhesh Poyarekar <siddhesh@redhat.com>
H.J. Lu <hjl.tools@gmail.com>
diff --git a/sysdeps/x86_64/multiarch/init-arch.c b/sysdeps/x86_64/multiarch/init-arch.c
index 7daaf46..9524aee 100644
--- a/sysdeps/x86_64/multiarch/init-arch.c
+++ b/sysdeps/x86_64/multiarch/init-arch.c
@@ -78,6 +78,13 @@ __init_cpu_features (void)
__cpu_features.feature[index_Slow_BSF] |= bit_Slow_BSF;
break;
+ case 0x37:
+ /* Unaligned load versions are faster than SSSE3
+ on Silvermont. */
+ __cpu_features.feature[index_Fast_Unaligned_Load]
+ |= bit_Fast_Unaligned_Load;
+ break;
+
default:
/* Unknown family 0x06 processors. Assuming this is one
of Core i3/i5/i7 processors if AVX is available. */
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 5 +++++
sysdeps/x86_64/multiarch/init-arch.c | 7 +++++++
2 files changed, 12 insertions(+), 0 deletions(-)
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