vendor/llvm/llvm-trunk-r321530

1 files changed, 10 insertions, 2 deletions

diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp
index 2a8088dc44528..f34549ae52b47 100644
--- a/lib/Analysis/ScalarEvolution.cpp
+++ b/lib/Analysis/ScalarEvolution.cpp
@@ -1268,7 +1268,11 @@ const SCEV *ScalarEvolution::getTruncateExpr(const SCEV *Op,
     }
     if (!hasTrunc)
       return getAddExpr(Operands);
-    UniqueSCEVs.FindNodeOrInsertPos(ID, IP);  // Mutates IP, returns NULL.
+    // In spite we checked in the beginning that ID is not in the cache,
+    // it is possible that during recursion and different modification
+    // ID came to cache, so if we found it, just return it.
+    if (const SCEV *S = UniqueSCEVs.FindNodeOrInsertPos(ID, IP))
+      return S;
   }
 
   // trunc(x1*x2*...*xN) --> trunc(x1)*trunc(x2)*...*trunc(xN) if we can
@@ -1284,7 +1288,11 @@ const SCEV *ScalarEvolution::getTruncateExpr(const SCEV *Op,
     }
     if (!hasTrunc)
       return getMulExpr(Operands);
-    UniqueSCEVs.FindNodeOrInsertPos(ID, IP);  // Mutates IP, returns NULL.
+    // In spite we checked in the beginning that ID is not in the cache,
+    // it is possible that during recursion and different modification
+    // ID came to cache, so if we found it, just return it.
+    if (const SCEV *S = UniqueSCEVs.FindNodeOrInsertPos(ID, IP))
+      return S;
   }
 
   // If the input value is a chrec scev, truncate the chrec's operands.