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[DAGCombiner] Slightly simplify some code by using APInt::isMask() and countTrailingOnes instead of getting active bits and checking if all the bits below that make a mask. 

At least for the 64-bit and less case, we should be able to determine if we even have a mask without counting any bits. This also removes the need to explicitly check for 0 active bits, isMask will return false for 0.

llvm-svn: 313908
This commit is contained in:
Craig Topper 2017-09-21 20:12:19 +00:00
parent 69dbbb0bca
commit de4379251e
1 changed files with 3 additions and 3 deletions
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6
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -3666,11 +3666,11 @@ SDValue DAGCombiner::visitANDLike(SDValue N0, SDValue N1, SDNode *N) {
bool DAGCombiner::isAndLoadExtLoad(ConstantSDNode *AndC, LoadSDNode *LoadN,
EVT LoadResultTy, EVT &ExtVT, EVT &LoadedVT,
bool &NarrowLoad) {
uint32_t ActiveBits = AndC->getAPIntValue().getActiveBits();
if (ActiveBits == 0 || !AndC->getAPIntValue().isMask(ActiveBits))
if (!AndC->getAPIntValue().isMask())
return false;
unsigned ActiveBits = AndC->getAPIntValue().countTrailingOnes();
ExtVT = EVT::getIntegerVT(*DAG.getContext(), ActiveBits);
LoadedVT = LoadN->getMemoryVT();