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Convert MaskedValueIsZero and all its users to use APInt. Also add

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a SignBitIsZero function to simplify a common use case.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47561 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2008-02-25 21:11:39 +00:00
parent 63602b8a69
commit 2e68b6f52d
10 changed files with 106 additions and 71 deletions
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6
include/llvm/CodeGen/SelectionDAG.h
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@ -555,10 +555,14 @@ public:
SDOperand FoldSetCC(MVT::ValueType VT, SDOperand N1,
SDOperand N2, ISD::CondCode Cond);
/// SignBitIsZero - Return true if the sign bit of Op is known to be zero. We
/// use this predicate to simplify operations downstream.
bool SignBitIsZero(SDOperand Op, unsigned Depth = 0) const;
/// MaskedValueIsZero - Return true if 'Op & Mask' is known to be zero. We
/// use this predicate to simplify operations downstream. Op and Mask are
/// known to be the same type.
bool MaskedValueIsZero(SDOperand Op, uint64_t Mask, unsigned Depth = 0)
bool MaskedValueIsZero(SDOperand Op, const APInt &Mask, unsigned Depth = 0)
const;
/// ComputeMaskedBits - Determine which of the bits specified in Mask are