src/share/vm/opto/loopopts.cpp

rev 10203 : 8149543: range check CastII nodes should not be split through Phi
Summary: splitting range check CastIIs through loop induction Phi prevents further optimizations
Reviewed-by:

*** 45,54 ****
--- 45,61 ----
      // ConvI2L may have type information on it which is unsafe to push up
      // so disable this for now
      return NULL;
    }
  
+   // Splitting range check CastIIs through a loop induction Phi can
+   // cause new Phis to be created that are left unrelated to the loop
+   // induction Phi and prevent optimizations (vectorization)
+   if (n->Opcode() == Op_CastII && n->as_CastII()->has_range_check()) {
+     return NULL;
+   }
+ 
    int wins = 0;
    assert(!n->is_CFG(), "");
    assert(region->is_Region(), "");
  
    const Type* type = n->bottom_type();