Avoid generating a convert_rndsat node when the src and dest type are the same.

llvm-svn: 60869
2008-12-11 03:30:13 +00:00 · 2008-12-11 03:30:13 +00:00 · bcdbfa854a
parent 02fe71290a
commit bcdbfa854a
1 changed files with 4 additions and 0 deletions
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@ -1140,6 +1140,10 @@ SDValue SelectionDAG::getCondCode(ISD::CondCode Cond) {
 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))