re PR tree-optimization/91896 (ICE in vect_get_vec_def_for_stmt_copy, at tree-vect-stmts.c:1687)

2019-09-25  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/91896
	* tree-vect-loop.c (vectorizable_reduction): The single
	def-use cycle optimization cannot apply when there's more
	than one pattern stmt involved.

	* gcc.dg/torture/pr91896.c: New testcase.

From-SVN: r276123

gcc/ChangeLog

+2019-09-25  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/91896
+	* tree-vect-loop.c (vectorizable_reduction): The single
+	def-use cycle optimization cannot apply when there's more
+	than one pattern stmt involved.
+
 2019-09-24  Iain Sandoe  <iain@sandoe.co.uk>
 
 	* config/rs6000/rs6000.md (load_macho_picbase_<mode>): New, using

gcc/testsuite/ChangeLog

+2019-09-25  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/91896
+	* gcc.dg/torture/pr91896.c: New testcase.
+
 2019-09-25  Martin Liska  <mliska@suse.cz>
 
 	* gcc.target/s390/pr91014.c: Move to ...

gcc/testsuite/gcc.dg/torture/pr91896.c

+/* { dg-do compile } */
+/* { dg-additional-options "-ftree-vectorize" } */
+
+unsigned int
+zj (unsigned int et)
+{
+  signed char jr = 0;
+
+  do {
+    et *= 3;
+    jr += 2;
+  } while (jr >= 0);
+
+  if (et == (unsigned int) jr)
+    et = 0;
+
+  return et;
+}

gcc/tree-vect-loop.c

@@ -6101,6 +6101,8 @@ vectorizable_reduction (stmt_vec_info stmt_info, gimple_stmt_iterator *gsi,
       if (ncopies > 1
 	  && STMT_VINFO_RELEVANT (reduc_stmt_info) <= vect_used_only_live
 	  && (use_stmt_info = loop_vinfo->lookup_single_use (phi_result))
+	  && (!STMT_VINFO_IN_PATTERN_P (use_stmt_info)
+	      || !STMT_VINFO_PATTERN_DEF_SEQ (use_stmt_info))
 	  && vect_stmt_to_vectorize (use_stmt_info) == reduc_stmt_info)
 	single_defuse_cycle = true;
 
@@ -6868,6 +6870,8 @@ vectorizable_reduction (stmt_vec_info stmt_info, gimple_stmt_iterator *gsi,
   if (ncopies > 1
       && (STMT_VINFO_RELEVANT (stmt_info) <= vect_used_only_live)
       && (use_stmt_info = loop_vinfo->lookup_single_use (reduc_phi_result))
+      && (!STMT_VINFO_IN_PATTERN_P (use_stmt_info)
+	  || !STMT_VINFO_PATTERN_DEF_SEQ (use_stmt_info))
       && vect_stmt_to_vectorize (use_stmt_info) == stmt_info)
     {
       single_defuse_cycle = true;