1 files changed, 39 insertions, 4 deletions
diff --git a/lib/Target/XCore/XCoreSelectionDAGInfo.cpp b/lib/Target/XCore/XCoreSelectionDAGInfo.cpp
index 44aeb60..91b33fd 100644
--- a/lib/Target/XCore/XCoreSelectionDAGInfo.cpp
+++ b/lib/Target/XCore/XCoreSelectionDAGInfo.cpp
@@ -11,13 +11,48 @@
 //
 //===----------------------------------------------------------------------===//
 
-#define DEBUG_TYPE "xcore-selectiondag-info"
 #include "XCoreTargetMachine.h"
 using namespace llvm;
 
-XCoreSelectionDAGInfo::XCoreSelectionDAGInfo(const XCoreTargetMachine &TM)
-  : TargetSelectionDAGInfo(TM) {
-}
+#define DEBUG_TYPE "xcore-selectiondag-info"
+
+XCoreSelectionDAGInfo::XCoreSelectionDAGInfo(const DataLayout &DL)
+    : TargetSelectionDAGInfo(&DL) {}
 
 XCoreSelectionDAGInfo::~XCoreSelectionDAGInfo() {
 }
+
+SDValue XCoreSelectionDAGInfo::
+EmitTargetCodeForMemcpy(SelectionDAG &DAG, SDLoc dl, SDValue Chain,
+                        SDValue Dst, SDValue Src, SDValue Size, unsigned Align,
+                        bool isVolatile, bool AlwaysInline,
+                        MachinePointerInfo DstPtrInfo,
+                        MachinePointerInfo SrcPtrInfo) const
+{
+  unsigned SizeBitWidth = Size.getValueType().getSizeInBits();
+  // Call __memcpy_4 if the src, dst and size are all 4 byte aligned.
+  if (!AlwaysInline && (Align & 3) == 0 &&
+      DAG.MaskedValueIsZero(Size, APInt(SizeBitWidth, 3))) {
+    const TargetLowering &TLI = *DAG.getTarget().getTargetLowering();
+    TargetLowering::ArgListTy Args;
+    TargetLowering::ArgListEntry Entry;
+    Entry.Ty = TLI.getDataLayout()->getIntPtrType(*DAG.getContext());
+    Entry.Node = Dst; Args.push_back(Entry);
+    Entry.Node = Src; Args.push_back(Entry);
+    Entry.Node = Size; Args.push_back(Entry);
+
+    TargetLowering::CallLoweringInfo CLI(DAG);
+    CLI.setDebugLoc(dl).setChain(Chain)
+      .setCallee(TLI.getLibcallCallingConv(RTLIB::MEMCPY),
+                 Type::getVoidTy(*DAG.getContext()),
+                 DAG.getExternalSymbol("__memcpy_4", TLI.getPointerTy()),
+                 std::move(Args), 0)
+      .setDiscardResult();
+
+    std::pair<SDValue,SDValue> CallResult = TLI.LowerCallTo(CLI);
+    return CallResult.second;
+  }
+
+  // Otherwise have the target-independent code call memcpy.
+  return SDValue();
+}