Change the interface of TLI.isMultiStoresCheaperThanBitsMerge.

This is for splitMergedValStore in DAG Combine to share the target query interface
with similar logic in CodeGenPrepare.

Differential Revision: https://reviews.llvm.org/D24707

llvm-svn: 290363

1 files changed, 9 insertions, 2 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index a91e727130d..1d28124ce7a 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -12435,8 +12435,15 @@ SDValue DAGCombiner::splitMergedValStore(StoreSDNode *ST) {
       Hi.getOperand(0).getValueSizeInBits() > HalfValBitSize)
     return SDValue();
 
-  if (!TLI.isMultiStoresCheaperThanBitsMerge(Lo.getOperand(0),
-                                             Hi.getOperand(0)))
+  // Use the EVT of low and high parts before bitcast as the input
+  // of target query.
+  EVT LowTy = (Lo.getOperand(0).getOpcode() == ISD::BITCAST)
+                  ? Lo.getOperand(0).getValueType()
+                  : Lo.getValueType();
+  EVT HighTy = (Hi.getOperand(0).getOpcode() == ISD::BITCAST)
+                   ? Hi.getOperand(0).getValueType()
+                   : Hi.getValueType();
+  if (!TLI.isMultiStoresCheaperThanBitsMerge(LowTy, HighTy))
     return SDValue();
 
   // Start to split store.