[TargetLowering] Make allowsMemoryAccess methode virtual.

Rename old function to explicitly show that it cares only about alignment.
The new allowsMemoryAccess call the function related to alignment by default
and can be overridden by target to inform whether the memory access is legal or
not.

Differential Revision: https://reviews.llvm.org/D67121

llvm-svn: 372935

1 files changed, 7 insertions, 6 deletions

diff --git a/llvm/lib/Target/XCore/XCoreISelLowering.cpp b/llvm/lib/Target/XCore/XCoreISelLowering.cpp
index fc6fd40c82e..ea3dcfc9d7d 100644
--- a/llvm/lib/Target/XCore/XCoreISelLowering.cpp
+++ b/llvm/lib/Target/XCore/XCoreISelLowering.cpp
@@ -414,8 +414,8 @@ SDValue XCoreTargetLowering::LowerLOAD(SDValue Op, SelectionDAG &DAG) const {
          "Unexpected extension type");
   assert(LD->getMemoryVT() == MVT::i32 && "Unexpected load EVT");
 
-  if (allowsMemoryAccess(Context, DAG.getDataLayout(), LD->getMemoryVT(),
-                         *LD->getMemOperand()))
+  if (allowsMemoryAccessForAlignment(Context, DAG.getDataLayout(),
+                                     LD->getMemoryVT(), *LD->getMemOperand()))
     return SDValue();
 
   SDValue Chain = LD->getChain();
@@ -488,8 +488,8 @@ SDValue XCoreTargetLowering::LowerSTORE(SDValue Op, SelectionDAG &DAG) const {
   assert(!ST->isTruncatingStore() && "Unexpected store type");
   assert(ST->getMemoryVT() == MVT::i32 && "Unexpected store EVT");
 
-  if (allowsMemoryAccess(Context, DAG.getDataLayout(), ST->getMemoryVT(),
-                         *ST->getMemOperand()))
+  if (allowsMemoryAccessForAlignment(Context, DAG.getDataLayout(),
+                                     ST->getMemoryVT(), *ST->getMemOperand()))
     return SDValue();
 
   SDValue Chain = ST->getChain();
@@ -1780,8 +1780,9 @@ SDValue XCoreTargetLowering::PerformDAGCombine(SDNode *N,
     // Replace unaligned store of unaligned load with memmove.
     StoreSDNode *ST = cast<StoreSDNode>(N);
     if (!DCI.isBeforeLegalize() ||
-        allowsMemoryAccess(*DAG.getContext(), DAG.getDataLayout(),
-                           ST->getMemoryVT(), *ST->getMemOperand()) ||
+        allowsMemoryAccessForAlignment(*DAG.getContext(), DAG.getDataLayout(),
+                                       ST->getMemoryVT(),
+                                       *ST->getMemOperand()) ||
         ST->isVolatile() || ST->isIndexed()) {
       break;
     }