[InstCombine] Use APInt::getActiveBits() to avoid creating an APInt from a trailing zero count to do a comparison. NFCI

llvm-svn: 313792

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
index b51d7bc4034..980519bcf9c 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
@@ -1718,7 +1718,7 @@ Instruction *InstCombiner::foldICmpAndConstConst(ICmpInst &Cmp,
   // result greater than C1.
   unsigned NumTZ = C2->countTrailingZeros();
   if (Cmp.getPredicate() == ICmpInst::ICMP_UGT && NumTZ < C2->getBitWidth() &&
-      APInt::getOneBitSet(C2->getBitWidth(), NumTZ).ugt(*C1)) {
+      NumTZ >= C1->getActiveBits()) {
     Constant *Zero = Constant::getNullValue(And->getType());
     return new ICmpInst(ICmpInst::ICMP_NE, And, Zero);
   }