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[SelectionDAG] Tidyup UDIV computeKnownBits implementation

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No need to clear KnownOne2/KnownZero2 bits as the next call to computeKnownBits will overwrite them anyway

llvm-svn: 285398
This commit is contained in:
Simon Pilgrim 2016-10-28 13:42:23 +00:00
parent 8ba1e1dccc
commit a8c45742e8
1 changed files with 0 additions and 2 deletions

2
lib/CodeGen/SelectionDAG/SelectionDAG.cpp

@ -2102,8 +2102,6 @@ void SelectionDAG::computeKnownBits(SDValue Op, APInt &KnownZero,
computeKnownBits(Op.getOperand(0), KnownZero2, KnownOne2, Depth+1);
unsigned LeadZ = KnownZero2.countLeadingOnes();
KnownOne2.clearAllBits();
KnownZero2.clearAllBits();
computeKnownBits(Op.getOperand(1), KnownZero2, KnownOne2, Depth+1);
unsigned RHSUnknownLeadingOnes = KnownOne2.countLeadingZeros();
if (RHSUnknownLeadingOnes != BitWidth)