[XCore] Target optimized library function __memcpy_4()

Summary:
If the src, dst and size of a memcpy are known to be 4 byte aligned we
can call __memcpy_4() instead of memcpy().

Reviewers: robertlytton

Reviewed By: robertlytton

CC: llvm-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D2871

llvm-svn: 202395

1 files changed, 9 insertions, 0 deletions

diff --git a/llvm/lib/Target/XCore/XCoreSelectionDAGInfo.h b/llvm/lib/Target/XCore/XCoreSelectionDAGInfo.h
index 0386968638b..31704f388a9 100644
--- a/llvm/lib/Target/XCore/XCoreSelectionDAGInfo.h
+++ b/llvm/lib/Target/XCore/XCoreSelectionDAGInfo.h
@@ -24,6 +24,15 @@ class XCoreSelectionDAGInfo : public TargetSelectionDAGInfo {
 public:
   explicit XCoreSelectionDAGInfo(const XCoreTargetMachine &TM);
   ~XCoreSelectionDAGInfo();
+
+  virtual SDValue
+  EmitTargetCodeForMemcpy(SelectionDAG &DAG, SDLoc dl,
+                          SDValue Chain,
+                          SDValue Op1, SDValue Op2,
+                          SDValue Op3, unsigned Align, bool isVolatile,
+                          bool AlwaysInline,
+                          MachinePointerInfo DstPtrInfo,
+                          MachinePointerInfo SrcPtrInfo) const;
 };
 
 }