re PR tree-optimization/92555 (ICE in exact_div, at poly-int.h:2162)

2019-09-19  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/92555
	* tree-vect-loop.c (vect_update_vf_for_slp): Also scan PHIs
	for non-SLP stmts.

	* gcc.dg/vect/pr92555.c: New testcase.

From-SVN: r278430

gcc/ChangeLog

+2019-09-19  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/92555
+	* tree-vect-loop.c (vect_update_vf_for_slp): Also scan PHIs
+	for non-SLP stmts.
+
 2019-11-19  Martin Liska  <mliska@suse.cz>
 
 	PR bootstrap/92540

gcc/testsuite/ChangeLog

+2019-09-19  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/92555
+	* gcc.dg/vect/pr92555.c: New testcase.
+
 2019-11-19  Joseph Myers  <joseph@codesourcery.com>
 
 	* gcc.dg/c2x-attr-fallthrough-5.c, gcc.dg/c2x-attr-syntax-5.c: New

gcc/testsuite/gcc.dg/vect/pr92555.c

+/* { dg-do compile } */
+/* { dg-additional-options "-fwrapv" } */
+
+signed char rq;
+
+signed char
+pu (int tr, int al)
+{
+  signed char x8;
+
+  while (tr != 0)
+    {
+      for (x8 = 0; x8 >= 0; x8 += 2)
+        ;
+
+      rq ^= al ^ 1;
+      ++x8;
+      ++tr;
+    }
+
+  return x8;
+}

gcc/tree-vect-loop.c

@@ -1398,6 +1398,18 @@ vect_update_vf_for_slp (loop_vec_info loop_vinfo)
   for (i = 0; i < nbbs; i++)
     {
       basic_block bb = bbs[i];
+      for (gphi_iterator si = gsi_start_phis (bb); !gsi_end_p (si);
+	   gsi_next (&si))
+	{
+	  stmt_vec_info stmt_info = loop_vinfo->lookup_stmt (si.phi ());
+	  if (!stmt_info)
+	    continue;
+	  if ((STMT_VINFO_RELEVANT_P (stmt_info)
+	       || VECTORIZABLE_CYCLE_DEF (STMT_VINFO_DEF_TYPE (stmt_info)))
+	      && !PURE_SLP_STMT (stmt_info))
+	    /* STMT needs both SLP and loop-based vectorization.  */
+	    only_slp_in_loop = false;
+	}
       for (gimple_stmt_iterator si = gsi_start_bb (bb); !gsi_end_p (si);
 	   gsi_next (&si))
 	{