diff options
| -rw-r--r-- | lib/Transforms/Scalar/InstructionCombining.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp index 6961806bcb..c803a18a35 100644 --- a/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/lib/Transforms/Scalar/InstructionCombining.cpp @@ -1011,6 +1011,11 @@ bool InstCombiner::SimplifyDemandedBits(Value *V, uint64_t DemandedMask, // If this is an integer truncate or noop, just look in the input. if (SrcTy->getPrimitiveSizeInBits() >= I->getType()->getPrimitiveSizeInBits()) { + // Cast to bool is a comparison against 0, which demands all bits. We + // can't propagate anything useful up. + if (I->getType() == Type::BoolTy) + break; + if (SimplifyDemandedBits(I->getOperand(0), DemandedMask, KnownZero, KnownOne, Depth+1)) return true; |