When folding a bitcast into a load or store, preserve the alignment

information of the original load or store, which is checked to be
at least as good, and possibly better.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52849 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 64aa7ed5e82b0bbc0131392670c97344b3e9acab..38171dff7520ee75b65b413fc81f409e4b56bc97 100644 (file)
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -3445,7 +3445,7 @@ SDOperand DAGCombiner::visitBIT_CONVERT(SDNode *N) {
     if (Align <= OrigAlign) {
       SDOperand Load = DAG.getLoad(VT, LN0->getChain(), LN0->getBasePtr(),
                                    LN0->getSrcValue(), LN0->getSrcValueOffset(),
-                                   LN0->isVolatile(), Align);
+                                   LN0->isVolatile(), OrigAlign);
       AddToWorkList(N);
       CombineTo(N0.Val, DAG.getNode(ISD::BIT_CONVERT, N0.getValueType(), Load),
                 Load.getValue(1));
@@ -4547,7 +4547,7 @@ SDOperand DAGCombiner::visitSTORE(SDNode *N) {
         ((!AfterLegalize && !ST->isVolatile()) ||
          TLI.isOperationLegal(ISD::STORE, SVT)))
       return DAG.getStore(Chain, Value.getOperand(0), Ptr, ST->getSrcValue(),
-                          ST->getSrcValueOffset(), ST->isVolatile(), Align);
+                          ST->getSrcValueOffset(), ST->isVolatile(), OrigAlign);
   }
 
   // Turn 'store float 1.0, Ptr' -> 'store int 0x12345678, Ptr'