re PR rtl-optimization/72488 (wrong code (SIGFPE) at -Os and above on…

re PR rtl-optimization/72488 (wrong code (SIGFPE) at -Os and above on x86_64-linux-gnu (in the 64-bit mode))

2017-01-19  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/72488
	* tree-ssa-sccvn.c (run_scc_vn): When we abort the VN make
	sure to restore SSA info.
	* tree-ssa.c (verify_ssa): Verify SSA info is not shared.

From-SVN: r244623

gcc/ChangeLog

+2017-01-19  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/72488
+	* tree-ssa-sccvn.c (run_scc_vn): When we abort the VN make
+	sure to restore SSA info.
+	* tree-ssa.c (verify_ssa): Verify SSA info is not shared.
+
 2017-01-19  Richard Earnshaw  <rearnsha@arm.com>
 
 	PR rtl-optimization/79121

gcc/tree-ssa-sccvn.c

@@ -4844,6 +4844,7 @@ run_scc_vn (vn_lookup_kind default_vn_walk_kind_)
   walker.walk (ENTRY_BLOCK_PTR_FOR_FN (cfun));
   if (walker.fail)
     {
+      scc_vn_restore_ssa_info ();
       free_scc_vn ();
       return false;
     }

gcc/tree-ssa.c

@@ -1027,9 +1027,11 @@ verify_ssa (bool check_modified_stmt, bool check_ssa_operands)
 
   timevar_push (TV_TREE_SSA_VERIFY);
 
+    {
       /* Keep track of SSA names present in the IL.  */
       size_t i;
       tree name;
+      hash_map <void *, tree> ssa_info;
 
       FOR_EACH_SSA_NAME (i, name, cfun)
 	{
@@ -1046,6 +1048,29 @@ verify_ssa (bool check_modified_stmt, bool check_ssa_operands)
 			      name, stmt, virtual_operand_p (name)))
 		goto err;
 	    }
+
+	  void *info = NULL;
+	  if (POINTER_TYPE_P (TREE_TYPE (name)))
+	    info = SSA_NAME_PTR_INFO (name);
+	  else if (INTEGRAL_TYPE_P (TREE_TYPE (name)))
+	    info = SSA_NAME_RANGE_INFO (name);
+	  if (info)
+	    {
+	      bool existed;
+	      tree &val = ssa_info.get_or_insert (info, &existed);
+	      if (existed)
+		{
+		  error ("shared SSA name info");
+		  print_generic_expr (stderr, val, 0);
+		  fprintf (stderr, " and ");
+		  print_generic_expr (stderr, name, 0);
+		  fprintf (stderr, "\n");
+		  goto err;
+		}
+	      else
+		val = name;
+	    }
+	}
     }
 
   calculate_dominance_info (CDI_DOMINATORS);