1 files changed, 64 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Target/Hexagon/HexagonSelectionDAGInfo.cpp b/contrib/llvm/lib/Target/Hexagon/HexagonSelectionDAGInfo.cpp
new file mode 100644
index 000000000000..002e87fb32ce
--- /dev/null
+++ b/contrib/llvm/lib/Target/Hexagon/HexagonSelectionDAGInfo.cpp
@@ -0,0 +1,64 @@
+//===-- HexagonSelectionDAGInfo.cpp - Hexagon SelectionDAG Info -----------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the HexagonSelectionDAGInfo class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "HexagonTargetMachine.h"
+#include "llvm/CodeGen/SelectionDAG.h"
+using namespace llvm;
+
+#define DEBUG_TYPE "hexagon-selectiondag-info"
+
+SDValue HexagonSelectionDAGInfo::EmitTargetCodeForMemcpy(
+    SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Dst, SDValue Src,
+    SDValue Size, unsigned Align, bool isVolatile, bool AlwaysInline,
+    MachinePointerInfo DstPtrInfo, MachinePointerInfo SrcPtrInfo) const {
+  ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size);
+  if (AlwaysInline || (Align & 0x3) != 0 || !ConstantSize)
+    return SDValue();
+
+  uint64_t SizeVal = ConstantSize->getZExtValue();
+  if (SizeVal < 32 || (SizeVal % 8) != 0)
+    return SDValue();
+
+  // Special case aligned memcpys with size >= 32 bytes and a multiple of 8.
+  //
+  const TargetLowering &TLI = *DAG.getSubtarget().getTargetLowering();
+  TargetLowering::ArgListTy Args;
+  TargetLowering::ArgListEntry Entry;
+  Entry.Ty = DAG.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);
+
+  const char *SpecialMemcpyName =
+      "__hexagon_memcpy_likely_aligned_min32bytes_mult8bytes";
+  const MachineFunction &MF = DAG.getMachineFunction();
+  bool LongCalls = MF.getSubtarget<HexagonSubtarget>().useLongCalls();
+  unsigned Flags = LongCalls ? HexagonII::HMOTF_ConstExtended : 0;
+
+  TargetLowering::CallLoweringInfo CLI(DAG);
+  CLI.setDebugLoc(dl)
+      .setChain(Chain)
+      .setLibCallee(
+          TLI.getLibcallCallingConv(RTLIB::MEMCPY),
+          Type::getVoidTy(*DAG.getContext()),
+          DAG.getTargetExternalSymbol(
+              SpecialMemcpyName, TLI.getPointerTy(DAG.getDataLayout()), Flags),
+          std::move(Args))
+      .setDiscardResult();
+
+  std::pair<SDValue, SDValue> CallResult = TLI.LowerCallTo(CLI);
+  return CallResult.second;
+}