Culling out use of unions for converting FP to bits and vice versa.

llvm-svn: 22838

1 files changed, 3 insertions, 14 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 6afa9d08947..81b08039a47 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -224,12 +224,8 @@ void SelectionDAG::RemoveNodeFromCSEMaps(SDNode *N) {
                                          N->getValueType(0)));
     break;
   case ISD::ConstantFP: {
-    union {
-      double DV;
-      uint64_t IV;
-    };
-    DV = cast<ConstantFPSDNode>(N)->getValue();
-    ConstantFPs.erase(std::make_pair(IV, N->getValueType(0)));
+    uint64_t V = DoubleToBits(cast<ConstantFPSDNode>(N)->getValue());
+    ConstantFPs.erase(std::make_pair(V, N->getValueType(0)));
     break;
   }
   case ISD::CONDCODE:
@@ -385,14 +381,7 @@ SDOperand SelectionDAG::getConstantFP(double Val, MVT::ValueType VT) {
   // Do the map lookup using the actual bit pattern for the floating point
   // value, so that we don't have problems with 0.0 comparing equal to -0.0, and
   // we don't have issues with SNANs.
-  union {
-    double DV;
-    uint64_t IV;
-  };
-
-  DV = Val;
-
-  SDNode *&N = ConstantFPs[std::make_pair(IV, VT)];
+  SDNode *&N = ConstantFPs[std::make_pair(DoubleToBits(Val), VT)];
   if (N) return SDOperand(N, 0);
   N = new ConstantFPSDNode(Val, VT);
   AllNodes.push_back(N);