diff options
| -rw-r--r-- | lib/Transforms/InstCombine/InstCombineShifts.cpp | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/lib/Transforms/InstCombine/InstCombineShifts.cpp b/lib/Transforms/InstCombine/InstCombineShifts.cpp index 9dd60dd4a2..836bda3693 100644 --- a/lib/Transforms/InstCombine/InstCombineShifts.cpp +++ b/lib/Transforms/InstCombine/InstCombineShifts.cpp @@ -394,16 +394,16 @@ Instruction *InstCombiner::visitLShr(BinaryOperator &I) { if (ConstantInt *Op1C = dyn_cast<ConstantInt>(Op1)) if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(Op0)) { + unsigned BitWidth = Op0->getType()->getScalarSizeInBits(); // ctlz.i32(x)>>5 --> zext(x == 0) // cttz.i32(x)>>5 --> zext(x == 0) // ctpop.i32(x)>>5 --> zext(x == -1) if ((II->getIntrinsicID() == Intrinsic::ctlz || II->getIntrinsicID() == Intrinsic::cttz || II->getIntrinsicID() == Intrinsic::ctpop) && - (1ULL << Op1C->getZExtValue()) == - Op0->getType()->getScalarSizeInBits()) { + isPowerOf2_32(BitWidth) && Log2_32(BitWidth) == Op1C->getZExtValue()){ bool isCtPop = II->getIntrinsicID() == Intrinsic::ctpop; - Constant *RHS = ConstantInt::getSigned(Op0->getType(), isCtPop ? -1 : 0); + Constant *RHS = ConstantInt::getSigned(Op0->getType(), isCtPop ? -1:0); Value *Cmp = Builder->CreateICmpEQ(II->getOperand(1), RHS); return new ZExtInst(Cmp, II->getType()); } |