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| author | Craig Topper <craig.topper@intel.com> | 2017-09-21 20:12:19 +0000 |
|---|---|---|
| committer | Craig Topper <craig.topper@intel.com> | 2017-09-21 20:12:19 +0000 |
| commit | de4379251ecbc083104a3796873b24ac677cd162 (patch) | |
| tree | ff78133627ab000380a618011c9140f88cbbc684 /llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | |
| parent | 69dbbb0bca7c4eb1bc3e15412393d7d23fffbdd2 (diff) | |
| download | bcm5719-llvm-de4379251ecbc083104a3796873b24ac677cd162.tar.gz bcm5719-llvm-de4379251ecbc083104a3796873b24ac677cd162.zip | |
[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
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index d9b56bfa897..7b499c2e43b 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -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(); |
