[llvm-commits] [llvm] r169740 - /llvm/trunk/lib/Target/X86/X86.td
Chandler Carruth
chandlerc at gmail.com
Mon Dec 10 10:22:42 PST 2012
Author: chandlerc
Date: Mon Dec 10 12:22:42 2012
New Revision: 169740
URL: http://llvm.org/viewvc/llvm-project?rev=169740&view=rev
Log:
Make '-mtune=x86_64' assume fast unaligned memory accesses.
Summary:
Not all chips targeted by x86_64 have this feature, but a dramatically
increasing number do. Specifying a chip-specific tuning parameter will
continue to turn the feature on or off as appropriate for that
particular chip, but the generic flag should try to achieve the best
performance on the most widely available hardware. Today, the number of
chips with fast UA access dwarfs those without in the x86-64 space.
Note that this also brings LLVM's code generation for this '-march' flag
more in line with that of modern GCCs.
CC: llvm-commits
Differential Revision: http://llvm-reviews.chandlerc.com/D195
Modified:
llvm/trunk/lib/Target/X86/X86.td
Modified: llvm/trunk/lib/Target/X86/X86.td
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86.td?rev=169740&r1=169739&r2=169740&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86.td (original)
+++ llvm/trunk/lib/Target/X86/X86.td Mon Dec 10 12:22:42 2012
@@ -155,7 +155,8 @@
def : Proc<"pentium-m", [FeatureSSE2, FeatureSlowBTMem]>;
def : Proc<"pentium4", [FeatureSSE2]>;
def : Proc<"pentium4m", [FeatureSSE2, FeatureSlowBTMem]>;
-def : Proc<"x86-64", [FeatureSSE2, Feature64Bit, FeatureSlowBTMem]>;
+def : Proc<"x86-64", [FeatureSSE2, Feature64Bit, FeatureSlowBTMem,
+ FeatureFastUAMem]>;
def : Proc<"yonah", [FeatureSSE3, FeatureSlowBTMem]>;
def : Proc<"prescott", [FeatureSSE3, FeatureSlowBTMem]>;
def : Proc<"nocona", [FeatureSSE3, FeatureCMPXCHG16B,
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