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| author | Chris Lattner <sabre@nondot.org> | 2011-02-06 22:05:31 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2011-02-06 22:05:31 +0000 |
| commit | c6ee9181a51fdfa3c07e1e53695681c55aa98ce4 (patch) | |
| tree | 1b11913f91b212aa9a03e4a16ee307d609a9a7c2 /lib/Analysis/InstructionSimplify.cpp | |
| parent | c35a44d3d73a429e59fb3044ee723db0511862f2 (diff) | |
| download | external_llvm-c6ee9181a51fdfa3c07e1e53695681c55aa98ce4.zip external_llvm-c6ee9181a51fdfa3c07e1e53695681c55aa98ce4.tar.gz external_llvm-c6ee9181a51fdfa3c07e1e53695681c55aa98ce4.tar.bz2 | |
teach instsimplify to transform (X / Y) * Y to X
when the div is an exact udiv.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124994 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Analysis/InstructionSimplify.cpp')
| -rw-r--r-- | lib/Analysis/InstructionSimplify.cpp | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/lib/Analysis/InstructionSimplify.cpp b/lib/Analysis/InstructionSimplify.cpp index 220868f..7bb8f69 100644 --- a/lib/Analysis/InstructionSimplify.cpp +++ b/lib/Analysis/InstructionSimplify.cpp @@ -735,9 +735,11 @@ static Value *SimplifyMulInst(Value *Op0, Value *Op1, const TargetData *TD, // (X / Y) * Y -> X if the division is exact. Value *X = 0, *Y = 0; if ((match(Op0, m_SDiv(m_Value(X), m_Value(Y))) && Y == Op1) || // (X / Y) * Y - (match(Op1, m_SDiv(m_Value(X), m_Value(Y))) && Y == Op0)) { // Y * (X / Y) - BinaryOperator *SDiv = cast<BinaryOperator>(Y == Op1 ? Op0 : Op1); - if (SDiv->isExact()) + (match(Op0, m_UDiv(m_Value(X), m_Value(Y))) && Y == Op1) || + (match(Op1, m_SDiv(m_Value(X), m_Value(Y))) && Y == Op0) || // Y * (X / Y) + (match(Op1, m_UDiv(m_Value(X), m_Value(Y))) && Y == Op0)) { + BinaryOperator *Div = cast<BinaryOperator>(Y == Op1 ? Op0 : Op1); + if (Div->isExact()) return X; } |