Fix a type mismatch assert in SCEV division

An assert was triggered when attempting to create a new SCEV
with operands of different types in the visitAddRecExpr. In this
test case, the operand types of the numerator and denominator
are different. The SCEV division code should generate a
conservative answer when this happens.

Differential Revision: http://reviews.llvm.org/D9021

llvm-svn: 235511

1 files changed, 8 insertions, 0 deletions

diff --git a/llvm/lib/Analysis/ScalarEvolution.cpp b/llvm/lib/Analysis/ScalarEvolution.cpp
index d88b0268651..9d99b8f77c9 100644
--- a/llvm/lib/Analysis/ScalarEvolution.cpp
+++ b/llvm/lib/Analysis/ScalarEvolution.cpp
@@ -795,6 +795,14 @@ public:
     assert(Numerator->isAffine() && "Numerator should be affine");
     divide(SE, Numerator->getStart(), Denominator, &StartQ, &StartR);
     divide(SE, Numerator->getStepRecurrence(SE), Denominator, &StepQ, &StepR);
+    // Bail out if the types do not match.
+    Type *Ty = Denominator->getType();
+    if (Ty != StartQ->getType() || Ty != StartR->getType() ||
+        Ty != StepQ->getType() || Ty != StepR->getType()) {
+      Quotient = Zero;
+      Remainder = Numerator;
+      return;
+    }
     Quotient = SE.getAddRecExpr(StartQ, StepQ, Numerator->getLoop(),
                                 Numerator->getNoWrapFlags());
     Remainder = SE.getAddRecExpr(StartR, StepR, Numerator->getLoop(),