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author | Chris Lattner <sabre@nondot.org> | 2001-12-14 16:52:09 +0000 |
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committer | Chris Lattner <sabre@nondot.org> | 2001-12-14 16:52:09 +0000 |
commit | 2d8a523490addd509bbaa3371b622bde3cb58c6a (patch) | |
tree | 537f4df795856741e596ea53581d1758d29d2b90 /include/llvm/Transforms/Scalar/InstructionCombining.h | |
parent | 528e8b58a52c6f5b6a2a694059679c04a49111c9 (diff) | |
download | external_llvm-2d8a523490addd509bbaa3371b622bde3cb58c6a.zip external_llvm-2d8a523490addd509bbaa3371b622bde3cb58c6a.tar.gz external_llvm-2d8a523490addd509bbaa3371b622bde3cb58c6a.tar.bz2 |
Initial checkin of instcombine
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1479 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'include/llvm/Transforms/Scalar/InstructionCombining.h')
-rw-r--r-- | include/llvm/Transforms/Scalar/InstructionCombining.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/include/llvm/Transforms/Scalar/InstructionCombining.h b/include/llvm/Transforms/Scalar/InstructionCombining.h new file mode 100644 index 0000000..09762d1 --- /dev/null +++ b/include/llvm/Transforms/Scalar/InstructionCombining.h @@ -0,0 +1,27 @@ +//===- 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 |