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[ValueTracking] computeKnownBitsFromShiftOperator - consistently use Known2 for the shifted value. NFCI. 

Minor cleanup as part of getting D90479 moving again.
This commit is contained in:
Simon Pilgrim 2020-11-10 16:33:41 +00:00
parent c7e275388e
commit 929a127932
1 changed files with 3 additions and 3 deletions
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6
llvm/lib/Analysis/ValueTracking.cpp
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@ -995,9 +995,9 @@ static void computeKnownBitsFromShiftOperator(
if (Known.isConstant()) { if (Known.isConstant()) {
unsigned ShiftAmt = Known.getConstant().getLimitedValue(BitWidth - 1); unsigned ShiftAmt = Known.getConstant().getLimitedValue(BitWidth - 1);
computeKnownBits(I->getOperand(0), DemandedElts, Known, Depth + 1, Q); computeKnownBits(I->getOperand(0), DemandedElts, Known2, Depth + 1, Q);
Known.Zero = KZF(Known.Zero, ShiftAmt); Known.Zero = KZF(Known2.Zero, ShiftAmt);
Known.One = KOF(Known.One, ShiftAmt); Known.One = KOF(Known2.One, ShiftAmt);
// If the known bits conflict, this must be an overflowing left shift, so // If the known bits conflict, this must be an overflowing left shift, so
// the shift result is poison. We can return anything we want. Choose 0 for // the shift result is poison. We can return anything we want. Choose 0 for
// the best folding opportunity. // the best folding opportunity.