Fix PR36032, PR35432

Summary:

The change fix an assert fail at ScalarEvolutionExpander.cpp:
  assert(ExitCount != SE.getCouldNotCompute() && "Invalid loop count");

Reviewers: sbaranga

Differential Revision: http://reviews.llvm.org/D42604

From: Evgeny Stupachenko <evstupac@gmail.com>
                         <evgeny.v.stupachenko@intel.com>
llvm-svn: 326154

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/Analysis/ScalarEvolution.cpp b/llvm/lib/Analysis/ScalarEvolution.cpp
index e75a29bd0a3..f75b55d4bf4 100644
--- a/llvm/lib/Analysis/ScalarEvolution.cpp
+++ b/llvm/lib/Analysis/ScalarEvolution.cpp
@@ -11649,6 +11649,12 @@ private:
     if (!PredicatedRewrite)
       return Expr;
     for (auto *P : PredicatedRewrite->second){
+      // Wrap predicates from outer loops are not supported.
+      if (auto *WP = dyn_cast<const SCEVWrapPredicate>(P)) {
+        auto *AR = cast<const SCEVAddRecExpr>(WP->getExpr());
+        if (L != AR->getLoop())
+          return Expr;
+      }
       if (!addOverflowAssumption(P))
         return Expr;
     }