Adding a feature flag to the llvm backend for x86 TBM instruction set.

Adding TBM feature to bdver2 processor; piledriver supports this instruction set
according to the following document:
http://developer.amd.com/wordpress/media/2012/10/New-Bulldozer-and-Piledriver-Instructions.pdf

Phabricator code review is located here: http://llvm-reviews.chandlerc.com/D1692

llvm-svn: 191324

1 files changed, 5 insertions, 0 deletions

diff --git a/llvm/lib/Target/X86/X86Subtarget.cpp b/llvm/lib/Target/X86/X86Subtarget.cpp
index f5b261428dc..05db662b2c4 100644
--- a/llvm/lib/Target/X86/X86Subtarget.cpp
+++ b/llvm/lib/Target/X86/X86Subtarget.cpp
@@ -384,6 +384,10 @@ void X86Subtarget::AutoDetectSubtargetFeatures() {
         ToggleFeature(X86::FeatureSHA);
       }
     }
+    if (IsAMD && ((ECX >> 21) & 0x1)) {
+      HasTBM = true;
+      ToggleFeature(X86::FeatureTBM);
+    }
   }
 }
 
@@ -492,6 +496,7 @@ void X86Subtarget::initializeEnvironment() {
   HasFMA = false;
   HasFMA4 = false;
   HasXOP = false;
+  HasTBM = false;
   HasMOVBE = false;
   HasRDRAND = false;
   HasF16C = false;