Can't fold the bit_convert is the store is a truncating store.
llvm-svn: 36962
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 290d621..744a474 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -3422,8 +3422,8 @@
SDOperand Ptr = ST->getBasePtr();
// If this is a store of a bit convert, store the input value if the
- // resultant store does not need a higher alignment than the original.
- if (Value.getOpcode() == ISD::BIT_CONVERT) {
+ // resultant store does not need a higher alignment than the original.
+ if (Value.getOpcode() == ISD::BIT_CONVERT && !ST->isTruncatingStore()) {
unsigned Align = ST->getAlignment();
MVT::ValueType SVT = Value.getOperand(0).getValueType();
unsigned OrigAlign = TLI.getTargetMachine().getTargetData()->