re PR tree-optimization/89710 (ICE in dyn_cast<gcond*, gimple>(gimple*) /…

re PR tree-optimization/89710 (ICE in dyn_cast<gcond*, gimple>(gimple*) / should_duplicate_loop_header_p)

2019-03-14  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/89710
	* tree-ssa-loop-ch.c (should_duplicate_loop_header_p): Use
	safe_dyn_cast.

	* gcc.dg/torture/pr89710.c: New testcase.

From-SVN: r269679

gcc/ChangeLog

+2019-03-14  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/89710
+	* tree-ssa-loop-ch.c (should_duplicate_loop_header_p): Use
+	safe_dyn_cast.
+
 2019-03-14  Martin Liska  <mliska@suse.cz>
 
 	* coverage.c (coverage_begin_function): Stream also

gcc/testsuite/ChangeLog

 2019-03-14  Richard Biener  <rguenther@suse.de>
 
+	PR tree-optimization/89710
+	* gcc.dg/torture/pr89710.c: New testcase.
+
+2019-03-14  Richard Biener  <rguenther@suse.de>
+
 	PR middle-end/89698
 	* g++.dg/torture/pr89698.C: New testcase.
 

gcc/testsuite/gcc.dg/torture/pr89710.c

+/* { dg-do compile } */
+
+void
+gm (int *);
+
+__attribute__ ((returns_twice)) void
+jg (void)
+{
+}
+
+void
+eb (void)
+{
+  int r6 = 0;
+
+  if (r6 != 0)
+    gm (&r6);
+}
+
+void
+gm (int *r6)
+{
+  jg ();
+
+  for (;;)
+    {
+      eb ();
+      *r6 = 0;
+    }
+}

gcc/tree-ssa-loop-ch.c

@@ -100,7 +100,7 @@ should_duplicate_loop_header_p (basic_block header, struct loop *loop,
       return false;
     }
 
-  gcond *last = dyn_cast <gcond *> (last_stmt (header));
+  gcond *last = safe_dyn_cast <gcond *> (last_stmt (header));
   if (!last)
     {
       if (dump_file && (dump_flags & TDF_DETAILS))