re PR tree-optimization/87117 (ICE in…

re PR tree-optimization/87117 (ICE in eliminate_dom_walker::eliminate_cleanup(bool) at gcc/gcc/tree-ssa-sccvn.c:5431 since r263875)

2018-08-28  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/87117
	* tree-ssa-sccvn.c (fully_constant_vn_reference_p): Exclude
	void which is is_gimple_reg_type by checking for COMPLETE_TYPE_P.

	* gcc.dg/pr87117-1.c: New testcase.

From-SVN: r263911

gcc/ChangeLog

 2018-08-28  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/87117
+	* tree-ssa-sccvn.c (fully_constant_vn_reference_p): Exclude
+	void which is is_gimple_reg_type by checking for COMPLETE_TYPE_P.
+
+2018-08-28  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/87117
 	* tree-ssa-pre.c (compute_avail): Do not make expressions
 	with predicated values available.
 	(get_expr_value_id): Assert we do not run into predicated value

gcc/testsuite/ChangeLog

 2018-08-28  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/87117
+	* gcc.dg/pr87117-1.c: New testcase.
+
+2018-08-28  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/87117
 	* gcc.dg/pr87117-2.c: New testcase.
 
 2018-08-28  Richard Biener  <rguenther@suse.de>

gcc/testsuite/gcc.dg/pr87117-1.c

+/* { dg-do compile } */
+/* { dg-options "-O2 -fno-inline -fno-tree-dce" } */
+
+int a, b, c;
+long *d;
+void fn1()
+{
+  for (; 0 < a;)
+    a++;
+}
+void fn3()
+{
+  for (; c; c++)
+    d[c] = 0;
+}
+void fn2()
+{
+  if (b)
+    fn3();
+  fn1();
+}

gcc/tree-ssa-sccvn.c

@@ -1408,6 +1408,7 @@ fully_constant_vn_reference_p (vn_reference_t ref)
 
   /* Simplify reads from constants or constant initializers.  */
   else if (BITS_PER_UNIT == 8
+	   && COMPLETE_TYPE_P (ref->type)
 	   && is_gimple_reg_type (ref->type)
 	   && (!INTEGRAL_TYPE_P (ref->type)
 	       || TYPE_PRECISION (ref->type) % BITS_PER_UNIT == 0))