re PR tree-optimization/88964 (ICE in wide_int_to_tree_1, at tree.c:1561)

	PR tree-optimization/88964
	* gimple-loop-interchange.cc (loop_cand::analyze_induction_var): Also
	punt if HONOR_SNANS (chrec).

From-SVN: r268247

gcc/ChangeLog

 2019-01-24  Jakub Jelinek  <jakub@redhat.com>
 
+	PR tree-optimization/88964
+	* gimple-loop-interchange.cc (loop_cand::analyze_induction_var): Also
+	punt if HONOR_SNANS (chrec).
+
 	PR middle-end/89015
 	* tree-nested.c (convert_nonlocal_reference_stmt,
 	convert_local_reference_stmt, convert_tramp_reference_stmt,

gcc/gimple-loop-interchange.cc

@@ -690,8 +690,8 @@ loop_cand::analyze_induction_var (tree var, tree chrec)
     {
       /* Punt on floating point invariants if honoring signed zeros,
 	 representing that as + 0.0 would change the result if init
-	 is -0.0.  */
-      if (HONOR_SIGNED_ZEROS (chrec))
+	 is -0.0.  Similarly for SNaNs it can raise exception.  */
+      if (HONOR_SIGNED_ZEROS (chrec) || HONOR_SNANS (chrec))
 	return false;
       struct induction *iv = XCNEW (struct induction);
       iv->var = var;