DependenceAnalysis: Don't crash if there is no constant operand.
This makes the code match the comments. Resolves a crash in loop idiom (PR14219).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167110 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/DependenceAnalysis.cpp b/lib/Analysis/DependenceAnalysis.cpp
index f97f0f2..c1321b6 100644
--- a/lib/Analysis/DependenceAnalysis.cpp
+++ b/lib/Analysis/DependenceAnalysis.cpp
@@ -2278,11 +2278,12 @@
assert(!Constant && "Surprised to find multiple constants");
Constant = cast<SCEVConstant>(Operand);
}
- else if (isa<SCEVMulExpr>(Operand)) {
+ else if (const SCEVMulExpr *Product = dyn_cast<SCEVMulExpr>(Operand)) {
// Search for constant operand to participate in GCD;
// If none found; return false.
- const SCEVConstant *ConstOp =
- getConstantPart(cast<SCEVMulExpr>(Operand));
+ const SCEVConstant *ConstOp = getConstantPart(Product);
+ if (!ConstOp)
+ return false;
APInt ConstOpValue = ConstOp->getValue()->getValue();
ExtraGCD = APIntOps::GreatestCommonDivisor(ExtraGCD,
ConstOpValue.abs());