[SystemZ] Use MVC for memcpy

Use MVC for memcpy in cases where a single MVC is enough.  Using MVC is
a win for longer copies too, but I'll leave that for later.

llvm-svn: 185802

1 files changed, 40 insertions, 0 deletions

diff --git a/llvm/lib/Target/SystemZ/SystemZSelectionDAGInfo.h b/llvm/lib/Target/SystemZ/SystemZSelectionDAGInfo.h
new file mode 100644
index 00000000000..39c149137c6
--- /dev/null
+++ b/llvm/lib/Target/SystemZ/SystemZSelectionDAGInfo.h
@@ -0,0 +1,40 @@
+//===-- SystemZSelectionDAGInfo.h - SystemZ SelectionDAG Info ---*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the SystemZ subclass for TargetSelectionDAGInfo.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef SYSTEMZSELECTIONDAGINFO_H
+#define SYSTEMZSELECTIONDAGINFO_H
+
+#include "llvm/Target/TargetSelectionDAGInfo.h"
+
+namespace llvm {
+
+class SystemZTargetMachine;
+
+class SystemZSelectionDAGInfo : public TargetSelectionDAGInfo {
+public:
+  explicit SystemZSelectionDAGInfo(const SystemZTargetMachine &TM);
+  ~SystemZSelectionDAGInfo();
+
+  virtual
+  SDValue EmitTargetCodeForMemcpy(SelectionDAG &DAG, SDLoc DL, SDValue Chain,
+                                  SDValue Dst, SDValue Src,
+                                  SDValue Size, unsigned Align,
+                                  bool IsVolatile, bool AlwaysInline,
+                                  MachinePointerInfo DstPtrInfo,
+                                  MachinePointerInfo SrcPtrInfo) const
+    LLVM_OVERRIDE;
+};
+
+}
+
+#endif