DAGCombiner: Avoid generating illegal vector INT_TO_FP nodes

DAGCombiner::reduceBuildVecConvertToConvertBuildVec() was making two
mistakes:

1. It was checking the legality of scalar INT_TO_FP nodes and then generating
vector nodes.

2. It was passing the result value type to
TargetLoweringInfo::getOperationAction() when it should have been
passing the value type of the first operand.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171420 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 5 insertions, 4 deletions

diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 6eed456594..b7a5f29fcd 100644
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -8625,11 +8625,8 @@ SDValue DAGCombiner::reduceBuildVecConvertToConvertBuildVec(SDNode *N) {
     if (Opcode == ISD::DELETED_NODE &&
         (Opc == ISD::UINT_TO_FP || Opc == ISD::SINT_TO_FP)) {
       Opcode = Opc;
-      // If not supported by target, bail out.
-      if (TLI.getOperationAction(Opcode, VT) != TargetLowering::Legal &&
-          TLI.getOperationAction(Opcode, VT) != TargetLowering::Custom)
-        return SDValue();
     }
+
     if (Opc != Opcode)
       return SDValue();
 
@@ -8654,6 +8651,10 @@ SDValue DAGCombiner::reduceBuildVecConvertToConvertBuildVec(SDNode *N) {
   assert(SrcVT != MVT::Other && "Cannot determine source type!");
 
   EVT NVT = EVT::getVectorVT(*DAG.getContext(), SrcVT, NumInScalars);
+
+  if (!TLI.isOperationLegalOrCustom(Opcode, NVT))
+    return SDValue();
+
   SmallVector<SDValue, 8> Opnds;
   for (unsigned i = 0; i != NumInScalars; ++i) {
     SDValue In = N->getOperand(i);