From 4a2b23e189cacb3c7afbfe3c38690768a01390ef Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Mon, 11 Oct 2004 04:07:27 +0000
Subject: [PATCH] Fix SingleSource/Benchmarks/McGill/chomp

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16912 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Analysis/ScalarEvolution.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp
index 6a2bc714bbe..31c85172f8a 100644
--- a/lib/Analysis/ScalarEvolution.cpp
+++ b/lib/Analysis/ScalarEvolution.cpp
@@ -1898,6 +1898,7 @@ SCEVHandle ScalarEvolutionsImpl::HowFarToZero(SCEV *V, const Loop *L) {
     //
     // Get the initial value for the loop.
     SCEVHandle Start = getSCEVAtScope(AddRec->getStart(), L->getParentLoop());
+    if (isa<SCEVCouldNotCompute>(Start)) return UnknownValue;
     SCEVHandle Step = AddRec->getOperand(1);
 
     Step = getSCEVAtScope(Step, L->getParentLoop());
-- 
2.34.1