* gimple-ssa-evrp-analyze.c

	(evrp_range_analyzer::record_ranges_from_phis): Only use SCEV to
	refine ranges if scev_initialized_p returns true.
	* vr-values.c (vr_values::extract_range_from_phi_node): Likewise.

From-SVN: r255211

gcc/ChangeLog

+2017-11-28  Jeff Law  <law@redhat.com>
+
+	* gimple-ssa-evrp-analyze.c
+	(evrp_range_analyzer::record_ranges_from_phis): Only use SCEV to
+	refine ranges if scev_initialized_p returns true.
+	* vr-values.c (vr_values::extract_range_from_phi_node): Likewise.
+
 2017-11-28  Julia Koval  <julia.koval@intel.com>
 
 	* config/i386/avx512vbmi2intrin.h (_mm512_shrdi_epi16,

gcc/gimple-ssa-evrp-analyze.c

@@ -246,7 +246,8 @@ evrp_range_analyzer::record_ranges_from_phis (basic_block bb)
 	     to use VARYING for them.  But we can still resort to
 	     SCEV for loop header PHIs.  */
 	  struct loop *l;
-	  if (interesting
+	  if (scev_initialized_p ()
+	      && interesting
 	      && (l = loop_containing_stmt (phi))
 	      && l->header == gimple_bb (phi))
 	  vr_values->adjust_range_with_scev (&vr_result, l, phi, lhs);

gcc/vr-values.c

@@ -2935,7 +2935,8 @@ scev_check:
      scev_check can be reached from two paths, one is a fall through from above
      "varying" label, the other is direct goto from code block which tries to
      avoid infinite simulation.  */
-  if ((l = loop_containing_stmt (phi))
+  if (scev_initialized_p ()
+      && (l = loop_containing_stmt (phi))
       && l->header == gimple_bb (phi))
     adjust_range_with_scev (vr_result, l, phi, lhs);