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Handle ands with ~0 correctly too. This fixes PR4052.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70176 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2009-04-27 01:41:10 +00:00
parent 0324205bbb
commit d6c329532b
2 changed files with 105 additions and 0 deletions
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lib/Analysis/ScalarEvolution.cpp
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@@ -1756,6 +1756,8 @@ SCEVHandle ScalarEvolution::createSCEV(Value *V) {
if (ConstantInt *CI = dyn_cast<ConstantInt>(U->getOperand(1))) {
if (CI->isNullValue())
return getSCEV(U->getOperand(1));
if (CI->isAllOnesValue())
return getSCEV(U->getOperand(0));
const APInt &A = CI->getValue();
unsigned Ones = A.countTrailingOnes();
if (APIntOps::isMask(Ones, A))