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For PR1205:
Provide an APIntified version of MaskedValueIsZero. This will (temporarily) cause a "defined but not used" message from the compiler. It will be used in the next patch in this series. Patch by Sheng Zhou. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35019 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -979,6 +979,16 @@ static bool MaskedValueIsZero(Value *V, uint64_t Mask, unsigned Depth = 0) {
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return (KnownZero & Mask) == Mask;
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}
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/// MaskedValueIsZero - Return true if 'V & Mask' is known to be zero. We use
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/// this predicate to simplify operations downstream. Mask is known to be zero
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/// for bits that V cannot have.
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static bool MaskedValueIsZero(Value *V, const APInt& Mask, unsigned Depth = 0) {
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APInt KnownZero(Mask), KnownOne(Mask);
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ComputeMaskedBits(V, Mask, KnownZero, KnownOne, Depth);
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assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
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return (KnownZero & Mask) == Mask;
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}
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/// ShrinkDemandedConstant - Check to see if the specified operand of the
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/// specified instruction is a constant integer. If so, check to see if there
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/// are any bits set in the constant that are not demanded. If so, shrink the
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