re PR tree-optimization/87967 (ICE in slpeel_duplicate_current_defs_from_edges)

2018-11-13  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/87967
	* tree-vect-loop.c (vect_transform_loop): Also copy PHIs
	for constants for the scalar loop.

	* g++.dg/opt/pr87967.C: New testcase.

From-SVN: r266070

gcc/ChangeLog

+2018-11-13  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/87967
+	* tree-vect-loop.c (vect_transform_loop): Also copy PHIs
+	for constants for the scalar loop.
+
 2018-11-13  Alan Modra  <amodra@gmail.com>
 
 	* config/rs6000/linux64.h (ASM_OUTPUT_SPECIAL_POOL_ENTRY_P): Exclude

gcc/testsuite/ChangeLog

+2018-11-13  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/87967
+	* g++.dg/opt/pr87967.C: New testcase.
+
 2018-11-13  Claudiu Zissulescu  <claziss@synopsys.com>
 
 	* gcc.target/arc/builtin_eh.c: New test.

gcc/testsuite/g++.dg/opt/pr87967.C

+// { dg-do compile { target c++11 } }
+// { dg-options "-O3" }
+
+void h();
+template <typename b> struct k { using d = b; };
+template <typename b, template <typename> class> using e = k<b>;
+template <typename b, template <typename> class f>
+using g = typename e<b, f>::d;
+struct l {
+  template <typename i> using ab = typename i::j;
+};
+struct n : l {
+  using j = g<char *, ab>;
+};
+class o {
+public:
+  long r();
+};
+char m;
+char s() {
+  if (m)
+    return '0';
+  return 'A';
+}
+class t {
+public:
+  typedef char *ad;
+  ad m_fn2();
+};
+void fn3() {
+  char *a;
+  t b;
+  bool p = false;
+  while (*a) {
+    h();
+    o c;
+    if (*a)
+      a++;
+    if (c.r()) {
+      n::j q;
+      for (t::ad d = b.m_fn2(), e; d != e; d++) {
+        char f = *q;
+        *d = f + s();
+      }
+      p = true;
+    }
+  }
+  if (p)
+    throw;
+}

gcc/tree-vect-loop.c

@@ -8264,7 +8264,7 @@ vect_transform_loop (loop_vec_info loop_vinfo)
       e = single_exit (LOOP_VINFO_SCALAR_LOOP (loop_vinfo));
       if (! single_pred_p (e->dest))
 	{
-	  split_loop_exit_edge (e);
+	  split_loop_exit_edge (e, true);
 	  if (dump_enabled_p ())
 	    dump_printf (MSG_NOTE, "split exit edge of scalar loop\n");
 	}