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| author | Chris Lattner <sabre@nondot.org> | 2003-03-10 23:23:04 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2003-03-10 23:23:04 +0000 |
| commit | 934a64cfa4475c7bacb235b13f5fe669dd0643e3 (patch) | |
| tree | c5be4062d4f164cf6b6065b04381fba51bb194f8 /llvm/lib | |
| parent | d7342fbd921a1f5eea0c62a6f218953ebabb4e31 (diff) | |
| download | bcm5719-llvm-934a64cfa4475c7bacb235b13f5fe669dd0643e3.tar.gz bcm5719-llvm-934a64cfa4475c7bacb235b13f5fe669dd0643e3.zip | |
Implement: -A*-B == A*B
llvm-svn: 5740
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Transforms/Scalar/InstructionCombining.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/Scalar/InstructionCombining.cpp b/llvm/lib/Transforms/Scalar/InstructionCombining.cpp index 79a551f70c8..067a884bc9d 100644 --- a/llvm/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/llvm/lib/Transforms/Scalar/InstructionCombining.cpp @@ -342,6 +342,10 @@ Instruction *InstCombiner::visitMul(BinaryOperator &I) { } } + if (Value *Op0v = dyn_castNegVal(Op0)) // -X * -Y = X*Y + if (Value *Op1v = dyn_castNegVal(I.getOperand(1))) + return BinaryOperator::create(Instruction::Mul, Op0v, Op1v); + return Changed ? &I : 0; } |
