tree-optimization/101003 - use pattern defs when linearizing

We of course have to use pattern stmt defs for the linearized
chain operands which is what I failed to ensure.

2021-06-10  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/101003
	* tree-vect-slp.c (vect_build_slp_tree_2): Appropriately
	use the pattern stmt defs when linearizing a chain.

diff --git a/gcc/tree-vect-slp.c b/gcc/tree-vect-slp.c
index 1915d74..c4f8f38 100644 (file)
--- a/gcc/tree-vect-slp.c
+++ b/gcc/tree-vect-slp.c
@@ -1806,6 +1806,11 @@ vect_build_slp_tree_2 (vec_info *vinfo, slp_tree node,
                  stmt_vec_info def_stmt_info;
                  bool res = vect_is_simple_use (op, vinfo, &dt, &def_stmt_info);
                  gcc_assert (res);
+                 if (dt == vect_internal_def)
+                   {
+                     def_stmt_info = vect_stmt_to_vectorize (def_stmt_info);
+                     op = gimple_get_lhs (def_stmt_info->stmt);
+                   }
                  gimple *use_stmt;
                  use_operand_p use_p;
                  if (dt == vect_internal_def