Add skeleton of simple basic block instruction selector.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54522 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 45 insertions, 0 deletions

diff --git a/lib/CodeGen/SelectionDAG/SimpleBBISel.h b/lib/CodeGen/SelectionDAG/SimpleBBISel.h
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index 0000000000..f5a8be588f
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+++ b/lib/CodeGen/SelectionDAG/SimpleBBISel.h
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+//===-- SimpleBBISel.cpp - Definition of the SimpleBBISel class -----------===//
+//
+//                     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 SimpleBBISel class which handles simple basic block
+// instruction selection. If the given BasicBlock is considered "simple", i.e.
+// all operations are supported by the target and their types are legal, it
+// does instruction directly from LLVM BasicBlock to MachineInstr's.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef SELECTIONDAG_SIMPLEBBISEL_H
+#define SELECTIONDAG_SIMPLEBBISEL_H
+
+#include "llvm/Support/Compiler.h"
+
+namespace llvm {
+
+class BasicBlock;
+class MachineBasicBlock;
+class MachineFunction;
+class TargetLowering;
+
+class VISIBILITY_HIDDEN SimpleBBISel {
+  MachineFunction &MF;
+  TargetLowering &TLI;
+  
+ public:
+  explicit SimpleBBISel(MachineFunction &mf, TargetLowering &tli)
+    : MF(mf), TLI(tli) {};
+
+  /// SelectBasicBlock - Try to convert a LLVM basic block into a
+  /// MachineBasicBlock using simple instruction selection. Returns false if it
+  /// is not able to do so.
+  bool SelectBasicBlock(BasicBlock *BB, MachineBasicBlock *MBB);
+};
+  
+} // end namespace llvm.
+
+#endif