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/// where V is a vector, the mask, known zero, and known one values are the
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/// same width as the vector element, and the bit is set only if it is true
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/// for all of the elements in the vector.
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void ComputeMaskedBits(Value *V, const APInt &Mask, APInt &KnownZero,
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void ComputeMaskedBits(Value *V, APInt &KnownZero, APInt &KnownOne,
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/// ComputeSignBit - Determine whether the sign bit is known to be zero or
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/// one. Convenience wrapper around ComputeMaskedBits.