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Fix Transforms/InstCombine/2006-09-15-CastToBool.ll and PR913
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30405 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1011,6 +1011,11 @@ bool InstCombiner::SimplifyDemandedBits(Value *V, uint64_t DemandedMask,
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// If this is an integer truncate or noop, just look in the input.
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if (SrcTy->getPrimitiveSizeInBits() >=
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I->getType()->getPrimitiveSizeInBits()) {
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// Cast to bool is a comparison against 0, which demands all bits. We
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// can't propagate anything useful up.
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if (I->getType() == Type::BoolTy)
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break;
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if (SimplifyDemandedBits(I->getOperand(0), DemandedMask,
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KnownZero, KnownOne, Depth+1))
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return true;
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