diff options
Diffstat (limited to 'lib/Analysis')
-rw-r--r-- | lib/Analysis/ScalarEvolution.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp index f0f3b1cb66..a654648578 100644 --- a/lib/Analysis/ScalarEvolution.cpp +++ b/lib/Analysis/ScalarEvolution.cpp @@ -5370,6 +5370,12 @@ SolveQuadraticEquation(const SCEVAddRecExpr *AddRec, ScalarEvolution &SE) { SqrtTerm *= B; SqrtTerm -= Four * (A * C); + if (SqrtTerm.isNegative()) { + // The loop is provably infinite. + const SCEV *CNC = SE.getCouldNotCompute(); + return std::make_pair(CNC, CNC); + } + // Compute sqrt(B^2-4ac). This is guaranteed to be the nearest // integer value or else APInt::sqrt() will assert. APInt SqrtVal(SqrtTerm.sqrt()); |