Can't introduce floating-point immediate constants after legalization.

Radar 9056407.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126864 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 7957098461cdde2a817ef0c18787281b3d4acb46..4c70bc3e88b8d2ce088543855099614cde4911a9 100644 (file)
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -5142,7 +5142,9 @@ SDValue DAGCombiner::visitSINT_TO_FP(SDNode *N) {
   EVT OpVT = N0.getValueType();
 
   // fold (sint_to_fp c1) -> c1fp
-  if (N0C && OpVT != MVT::ppcf128)
+  if (N0C && OpVT != MVT::ppcf128 &&
+      // ...but only if the target supports immediate floating-point values
+      (Level == llvm::Unrestricted || TLI.isOperationLegalOrCustom(llvm::ISD::ConstantFP, VT)))
     return DAG.getNode(ISD::SINT_TO_FP, N->getDebugLoc(), VT, N0);
 
   // If the input is a legal type, and SINT_TO_FP is not legal on this target,
@@ -5164,7 +5166,9 @@ SDValue DAGCombiner::visitUINT_TO_FP(SDNode *N) {
   EVT OpVT = N0.getValueType();
 
   // fold (uint_to_fp c1) -> c1fp
-  if (N0C && OpVT != MVT::ppcf128)
+  if (N0C && OpVT != MVT::ppcf128 &&
+      // ...but only if the target supports immediate floating-point values
+      (Level == llvm::Unrestricted || TLI.isOperationLegalOrCustom(llvm::ISD::ConstantFP, VT)))
     return DAG.getNode(ISD::UINT_TO_FP, N->getDebugLoc(), VT, N0);
 
   // If the input is a legal type, and UINT_TO_FP is not legal on this target,