[PATCH] Optimize isValueEqualInPotentialCycles

[Daniel Berlin]

Hi nlewycky, hfinkel,

On larger test cases, we actually spend some time going to grab pass info and such, to be able to do the for loop, even if there is nothing in the visited set.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8433

Files:
  lib/Analysis/BasicAliasAnalysis.cpp

Index: lib/Analysis/BasicAliasAnalysis.cpp
===================================================================
--- lib/Analysis/BasicAliasAnalysis.cpp
+++ lib/Analysis/BasicAliasAnalysis.cpp
@@ -1526,6 +1526,9 @@
   if (!Inst)
     return true;
 
+  if (VisitedPhiBBs.empty())
+    return true;
+
   if (VisitedPhiBBs.size() > MaxNumPhiBBsValueReachabilityCheck)
     return false;

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