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[ValueTracking] Remove unnecessary temporary APInt from computeNumSignBitsVectorConstant. 

We can just use getNumSignBits instead of inverting negative numbers.

llvm-svn: 316266
This commit is contained in:
Craig Topper 2017-10-21 16:35:41 +00:00
parent b98ee58511
commit 8e8b6efdc8
1 changed files with 1 additions and 5 deletions
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6
llvm/lib/Analysis/ValueTracking.cpp
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@ -2097,11 +2097,7 @@ static unsigned computeNumSignBitsVectorConstant(const Value *V,
if (!Elt)
return 0;
// If the sign bit is 1, flip the bits, so we always count leading zeros.
APInt EltVal = Elt->getValue();
if (EltVal.isNegative())
EltVal = ~EltVal;
MinSignBits = std::min(MinSignBits, EltVal.countLeadingZeros());
MinSignBits = std::min(MinSignBits, Elt->getValue().getNumSignBits());
}
return MinSignBits;