From d086fc7ba0d4b58c9db901780cb8adf415e1f2b5 Mon Sep 17 00:00:00 2001 From: Liubov Dmitrieva Date: Fri, 14 Jun 2013 20:46:15 +0200 Subject: 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. --- ChangeLog | 5 +++++ sysdeps/x86_64/multiarch/init-arch.c | 7 +++++++ 2 files changed, 12 insertions(+) diff --git a/ChangeLog b/ChangeLog index 77ac80380c..86d98f7274 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,8 @@ +2013-06-14 Liubov Dmitrieva + + * sysdeps/x86_64/multiarch/init-arch.c (__init_cpu_features): + Set bit_Fast_Unaligned_Load for Intel Silvermont architecture. + 2013-06-14 Siddhesh Poyarekar H.J. Lu diff --git a/sysdeps/x86_64/multiarch/init-arch.c b/sysdeps/x86_64/multiarch/init-arch.c index 7daaf46099..9524aeea18 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. */ -- cgit 1.4.1