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[InstCombine] Remove unnecessary temporary APInt. NFCI 

llvm-svn: 309887
This commit is contained in:
Craig Topper 2017-08-02 21:05:40 +00:00
parent ecd901314d
commit fc9bf50dee
1 changed files with 1 additions and 6 deletions
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7
llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
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@ -527,11 +527,6 @@ Value *InstCombiner::SimplifyDemandedUseBits(Value *V, APInt DemandedMask,
Known.Zero.lshrInPlace(ShiftAmt);
Known.One.lshrInPlace(ShiftAmt);
// Handle the sign bits.
APInt SignMask(APInt::getSignMask(BitWidth));
// Adjust to where it is now in the mask.
SignMask.lshrInPlace(ShiftAmt);
// If the input sign bit is known to be zero, or if none of the top bits
// are demanded, turn this into an unsigned shift right.
assert(BitWidth > ShiftAmt && "Shift amount not saturated?");
@ -541,7 +536,7 @@ Value *InstCombiner::SimplifyDemandedUseBits(Value *V, APInt DemandedMask,
I->getOperand(1));
LShr->setIsExact(cast<BinaryOperator>(I)->isExact());
return InsertNewInstWith(LShr, *I);
} else if (Known.One.intersects(SignMask)) { // New bits are known one.
} else if (Known.One[BitWidth-ShiftAmt-1]) { // New bits are known one.
Known.One |= HighBits;
}
}