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| author | Chris Lattner <sabre@nondot.org> | 2003-06-25 17:09:20 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2003-06-25 17:09:20 +0000 |
| commit | 0af1fab019fba132f40748fe549cf6b1d5d8672b (patch) | |
| tree | 3c09916f447b6746d2b65ac0b1e1555017e4bdb1 /lib | |
| parent | 5db61fdc8a0f81d4277e5b6cc7b7f8ab35d4c8c4 (diff) | |
| download | external_llvm-0af1fab019fba132f40748fe549cf6b1d5d8672b.tar.gz external_llvm-0af1fab019fba132f40748fe549cf6b1d5d8672b.tar.bz2 external_llvm-0af1fab019fba132f40748fe549cf6b1d5d8672b.zip | |
Instcombine: X * -1 -> -X
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6904 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Transforms/Scalar/InstructionCombining.cpp | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp index 505313ba9c..696575e3d6 100644 --- a/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/lib/Transforms/Scalar/InstructionCombining.cpp @@ -361,10 +361,11 @@ Instruction *InstCombiner::visitMul(BinaryOperator &I) { if (Constant *Op1 = dyn_cast<Constant>(I.getOperand(1))) { if (ConstantInt *CI = dyn_cast<ConstantInt>(Op1)) { const Type *Ty = CI->getType(); - uint64_t Val = Ty->isSigned() ? - (uint64_t)cast<ConstantSInt>(CI)->getValue() : - cast<ConstantUInt>(CI)->getValue(); + int64_t Val = Ty->isSigned() ? cast<ConstantSInt>(CI)->getValue() : + (int64_t)cast<ConstantUInt>(CI)->getValue(); switch (Val) { + case -1: // X * -1 -> -X + return BinaryOperator::createNeg(Op0, I.getName()); case 0: return ReplaceInstUsesWith(I, Op1); // Eliminate 'mul double %X, 0' case 1: |