Added lower packed support for the extractelement operation.

llvm-svn: 25180

1 files changed, 12 insertions, 0 deletions

diff --git a/llvm/lib/Transforms/Scalar/SCCP.cpp b/llvm/lib/Transforms/Scalar/SCCP.cpp
index 491ca73fa3b..1a76eb5e5e8 100644
--- a/llvm/lib/Transforms/Scalar/SCCP.cpp
+++ b/llvm/lib/Transforms/Scalar/SCCP.cpp
@@ -322,6 +322,7 @@ private:
   void visitSelectInst(SelectInst &I);
   void visitBinaryOperator(Instruction &I);
   void visitShiftInst(ShiftInst &I) { visitBinaryOperator(I); }
+  void visitExtractElementInst(ExtractElementInst &I);
 
   // Instructions that cannot be folded away...
   void visitStoreInst     (Instruction &I);
@@ -728,6 +729,17 @@ void SCCPSolver::visitBinaryOperator(Instruction &I) {
   }
 }
 
+void SCCPSolver::visitExtractElementInst(ExtractElementInst &I) {
+  LatticeVal &ValState = getValueState(I.getOperand(0));
+  LatticeVal &IdxState = getValueState(I.getOperand(1));
+
+  if (ValState.isOverdefined() || IdxState.isOverdefined())
+    markOverdefined(&I);
+  else if(ValState.isConstant() && IdxState.isConstant())
+    markConstant(&I, ConstantExpr::getExtractElement(ValState.getConstant(),
+                                                     IdxState.getConstant()));
+}
+
 // Handle getelementptr instructions... if all operands are constants then we
 // can turn this into a getelementptr ConstantExpr.
 //