re PR tree-optimization/89572 (ICE in dyn_cast<gcond*, gimple>(gimple*) /…

re PR tree-optimization/89572 (ICE in dyn_cast<gcond*, gimple>(gimple*) / get_loop_exit_condition(loop const*))

2019-03-04  Richard Biener  <rguenther@suse.de>

	PR middle-end/89572
	* tree-scalar-evolution.c: (get_loop_exit_condition): Use
	safe_dyn_cast.

	* gcc.dg/torture/pr89572.c: New testcase.

From-SVN: r269363

gcc/ChangeLog

+2019-03-04  Richard Biener  <rguenther@suse.de>
+
+	PR middle-end/89572
+	* tree-scalar-evolution.c: (get_loop_exit_condition): Use
+	safe_dyn_cast.
+
 2019-03-04  Bin Cheng  <bin.cheng@linux.alibaba.com>
 
 	PR tree-optimization/89487

gcc/testsuite/ChangeLog

+2019-03-04  Richard Biener  <rguenther@suse.de>
+
+	PR middle-end/89572
+	* gcc.dg/torture/pr89572.c: New testcase.
+
 2018-03-04  Bin Cheng  <bin.cheng@linux.alibaba.com>
 
 	PR tree-optimization/89487

gcc/testsuite/gcc.dg/torture/pr89572.c

+/* { dg-do compile } */
+/* { dg-additional-options "-finline-functions" } */
+
+int vh, it, k1;
+
+void
+vn (void)
+{
+  ++vh;
+  if (vh == 0 && it == 0)
+    k1 = -k1;
+}
+
+__attribute__ ((returns_twice)) void
+ef (int *uw)
+{
+  while (uw != (void *) 0)
+    {
+      vn ();
+      *uw = 0;
+    }
+}
+
+void
+gu (int *uw)
+{
+  ef (uw);
+}

gcc/tree-scalar-evolution.c

@@ -910,7 +910,7 @@ get_loop_exit_condition (const struct loop *loop)
       gimple *stmt;
 
       stmt = last_stmt (exit_edge->src);
-      if (gcond *cond_stmt = dyn_cast <gcond *> (stmt))
+      if (gcond *cond_stmt = safe_dyn_cast <gcond *> (stmt))
 	res = cond_stmt;
     }