add a couple of missing folds
llvm-svn: 26724
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 1e05d58..1d6d40e 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -2102,6 +2102,18 @@
// fold (fp_round c1fp) -> c1fp
if (N0CFP)
return DAG.getNode(ISD::FP_ROUND, VT, N0);
+
+ // fold (fp_round (fp_extend x)) -> x
+ if (N0.getOpcode() == ISD::FP_EXTEND && VT == N0.getOperand(0).getValueType())
+ return N0.getOperand(0);
+
+ // fold (fp_round (copysign X, Y)) -> (copysign (fp_round X), Y)
+ if (N0.getOpcode() == ISD::FCOPYSIGN && N0.Val->hasOneUse()) {
+ SDOperand Tmp = DAG.getNode(ISD::FP_ROUND, VT, N0.getOperand(0));
+ AddToWorkList(Tmp.Val);
+ return DAG.getNode(ISD::FCOPYSIGN, VT, Tmp, N0.getOperand(1));
+ }
+
return SDOperand();
}