re PR tree-optimization/84929 (ICE at -O3 on valid code on x86_64-linux-gnu:…

re PR tree-optimization/84929 (ICE at -O3 on valid code on x86_64-linux-gnu: tree check: expected polynomial_chrec, have nop_expr in analyze_siv_subscript_cst_affine, at tree-data-ref.c:3018)

2018-03-19  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/84929
	* tree-data-ref.c (analyze_siv_subscript_cst_affine): Guard
	chrec_is_positive against non-chrec arg.

	* gcc.dg/torture/pr84929.c: New testcase.

From-SVN: r258643

gcc/ChangeLog

+2018-03-19  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/84929
+	* tree-data-ref.c (analyze_siv_subscript_cst_affine): Guard
+	chrec_is_positive against non-chrec arg.
+
 2018-03-19  Tamar Christina  <tamar.christina@arm.com>
 
 	PR target/84711

gcc/testsuite/ChangeLog

+2018-03-19  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/84929
+	* gcc.dg/torture/pr84929.c: New testcase.
+
 2018-03-19  Tamar Christina  <tamar.christina@arm.com>
 
 	PR target/84711

gcc/testsuite/gcc.dg/torture/pr84929.c

+/* { dg-do compile } */
+/* { dg-require-effective-target int32plus } */
+
+int a[4];
+void fn1()
+{
+  __UINT64_TYPE__ b = 7818038963515661296;
+  for (;; b++)
+    a[0xA699ECD2C348A3A0] = a[b];
+}

gcc/tree-data-ref.c

@@ -3015,7 +3015,8 @@ analyze_siv_subscript_cst_affine (tree chrec_a,
     {
       if (value0 == false)
 	{
-	  if (!chrec_is_positive (CHREC_RIGHT (chrec_b), &value1))
+	  if (TREE_CODE (chrec_b) != POLYNOMIAL_CHREC
+	      || !chrec_is_positive (CHREC_RIGHT (chrec_b), &value1))
 	    {
 	      if (dump_file && (dump_flags & TDF_DETAILS))
 		fprintf (dump_file, "siv test failed: chrec not positive.\n");
@@ -3096,7 +3097,8 @@ analyze_siv_subscript_cst_affine (tree chrec_a,
 	}
       else
 	{
-	  if (!chrec_is_positive (CHREC_RIGHT (chrec_b), &value2))
+	  if (TREE_CODE (chrec_b) != POLYNOMIAL_CHREC
+	      || !chrec_is_positive (CHREC_RIGHT (chrec_b), &value2))
 	    {
 	      if (dump_file && (dump_flags & TDF_DETAILS))
 		fprintf (dump_file, "siv test failed: chrec not positive.\n");