Initial checkin of instcombine

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1479 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/Transforms/Scalar/InstructionCombining.h b/include/llvm/Transforms/Scalar/InstructionCombining.h
new file mode 100644 (file)
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+++ b/include/llvm/Transforms/Scalar/InstructionCombining.h
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+//===- llvm/Transforms/Scalar/InstructionCombining.h -------------*- C++ -*--=//
+//
+// InstructionCombining - Combine instructions to form fewer, simple
+//   instructions.  This pass does not modify the CFG, and has a tendancy to
+//   make instructions dead, so a subsequent DCE pass is useful.
+//
+// This pass combines things like:
+//    %Y = add int 1, %X
+//    %Z = add int 1, %Y
+// into:
+//    %Z = add int 2, %X
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TRANSFORMS_SCALAR_INSTRUCTIONCOMBINING_H
+#define LLVM_TRANSFORMS_SCALAR_INSTRUCTIONCOMBINING_H
+
+#include "llvm/Pass.h"
+
+struct InstructionCombining : public Pass {
+  static bool doit(Method *M);
+  static bool CombineInstruction(Instruction *I);
+
+  virtual bool doPerMethodWork(Method *M) { return doit(M); }
+};
+
+#endif