re PR tree-optimization/92222 (ice in useless_type_conversion_p, at gimple-expr.c:86)

2019-10-25  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/92222
	* tree-vect-slp.c (_slp_oprnd_info::first_pattern): Remove.
	(_slp_oprnd_info::second_pattern): Likewise.
	(_slp_oprnd_info::any_pattern): New.
	(vect_create_oprnd_info): Adjust.
	(vect_get_and_check_slp_defs): Compute whether any stmt is
	in a pattern.
	(vect_build_slp_tree_2): Avoid building up a node from scalars
	if any of the operand defs, not just the first, is in a pattern.

	* gcc.dg/torture/pr92222.c: New testcase.

From-SVN: r277448

gcc/ChangeLog

 2019-10-25  Richard Biener  <rguenther@suse.de>
 
+	PR tree-optimization/92222
+	* tree-vect-slp.c (_slp_oprnd_info::first_pattern): Remove.
+	(_slp_oprnd_info::second_pattern): Likewise.
+	(_slp_oprnd_info::any_pattern): New.
+	(vect_create_oprnd_info): Adjust.
+	(vect_get_and_check_slp_defs): Compute whether any stmt is
+	in a pattern.
+	(vect_build_slp_tree_2): Avoid building up a node from scalars
+	if any of the operand defs, not just the first, is in a pattern.
+
+2019-10-25  Richard Biener  <rguenther@suse.de>
+
 	* tree-vect-slp.c (vect_get_and_check_slp_defs): Only fail
 	swapping if we actually have to modify the IL on a shared stmt.
 	(vect_build_slp_tree_2): Never fail swapping on shared stmts

gcc/testsuite/ChangeLog

+2019-10-25  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/92222
+	* gcc.dg/torture/pr92222.c: New testcase.
+
 2019-10-25  Richard Sandiford  <richard.sandiford@arm.com>
 
 	* gcc.target/aarch64/sve/reduc_strict_3.c (double_reduc1): Prevent

gcc/testsuite/gcc.dg/torture/pr92222.c

+/* { dg-do compile } */
+/* { dg-additional-options "-ftree-vectorize" } */
+
+unsigned char *a;
+int b;
+void f();
+void c()
+{
+  char *d;
+  int e;
+  for (; b; b++) {
+      e = 7;
+      for (; e >= 0; e--)
+	*d++ = a[b] & 1 << e ? '1' : '0';
+  }
+  f();
+}

gcc/tree-vect-slp.c

@@ -177,8 +177,7 @@ typedef struct _slp_oprnd_info
      stmt.  */
   tree first_op_type;
   enum vect_def_type first_dt;
-  bool first_pattern;
-  bool second_pattern;
+  bool any_pattern;
 } *slp_oprnd_info;
 
 
@@ -199,8 +198,7 @@ vect_create_oprnd_info (int nops, int group_size)
       oprnd_info->ops.create (group_size);
       oprnd_info->first_dt = vect_uninitialized_def;
       oprnd_info->first_op_type = NULL_TREE;
-      oprnd_info->first_pattern = false;
-      oprnd_info->second_pattern = false;
+      oprnd_info->any_pattern = false;
       oprnds_info.quick_push (oprnd_info);
     }
 
@@ -339,13 +337,11 @@ vect_get_and_check_slp_defs (vec_info *vinfo, unsigned char *swap,
   tree oprnd;
   unsigned int i, number_of_oprnds;
   enum vect_def_type dt = vect_uninitialized_def;
-  bool pattern = false;
   slp_oprnd_info oprnd_info;
   int first_op_idx = 1;
   unsigned int commutative_op = -1U;
   bool first_op_cond = false;
   bool first = stmt_num == 0;
-  bool second = stmt_num == 1;
 
   if (gcall *stmt = dyn_cast <gcall *> (stmt_info->stmt))
     {
@@ -418,13 +414,12 @@ again:
 	  return -1;
 	}
 
-      if (second)
-	oprnd_info->second_pattern = pattern;
+      if (def_stmt_info && is_pattern_stmt_p (def_stmt_info))
+	oprnd_info->any_pattern = true;
 
       if (first)
 	{
 	  oprnd_info->first_dt = dt;
-	  oprnd_info->first_pattern = pattern;
 	  oprnd_info->first_op_type = TREE_TYPE (oprnd);
 	}
       else
@@ -1311,7 +1306,7 @@ vect_build_slp_tree_2 (vec_info *vinfo,
 	      /* ???  Rejecting patterns this way doesn't work.  We'd have to
 		 do extra work to cancel the pattern so the uses see the
 		 scalar version.  */
-	      && !is_pattern_stmt_p (SLP_TREE_SCALAR_STMTS (child)[0]))
+	      && !oprnd_info->any_pattern)
 	    {
 	      slp_tree grandchild;
 
@@ -1358,7 +1353,8 @@ vect_build_slp_tree_2 (vec_info *vinfo,
 	  /* ???  Rejecting patterns this way doesn't work.  We'd have to
 	     do extra work to cancel the pattern so the uses see the
 	     scalar version.  */
-	  && !is_pattern_stmt_p (stmt_info))
+	  && !is_pattern_stmt_p (stmt_info)
+	  && !oprnd_info->any_pattern)
 	{
 	  if (dump_enabled_p ())
 	    dump_printf_loc (MSG_NOTE, vect_location,
@@ -1447,7 +1443,7 @@ vect_build_slp_tree_2 (vec_info *vinfo,
 		  /* ???  Rejecting patterns this way doesn't work.  We'd have
 		     to do extra work to cancel the pattern so the uses see the
 		     scalar version.  */
-		  && !is_pattern_stmt_p (SLP_TREE_SCALAR_STMTS (child)[0]))
+		  && !oprnd_info->any_pattern)
 		{
 		  unsigned int j;
 		  slp_tree grandchild;