Avoid generating a convert_rndsat node when the src and dest type are the same.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60869 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index bb3b42c..33eddae 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -1140,6 +1140,10 @@
SDValue SelectionDAG::getConvertRndSat(MVT VT, SDValue Val, SDValue DTy,
SDValue STy, SDValue Rnd, SDValue Sat,
ISD::CvtCode Code) {
+ // If the src and dest types are the same, no conversion is necessary.
+ if (DTy == STy)
+ return Val;
+
FoldingSetNodeID ID;
void* IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))