tree-outof-ssa.h (ssaexpand): Add partitions_for_undefined_values.

	* tree-outof-ssa.h (ssaexpand): Add partitions_for_undefined_values.
	(always_initialized_rtx_for_ssa_name_p): New predicate.
	* tree-outof-ssa.c (remove_ssa_form): Initialize new field of SA.
	(finish_out_of_ssa): Free new field of SA.
	* tree-ssa-coalesce.h (get_undefined_value_partitions): Declare.
	* tree-ssa-coalesce.c: Include tree-ssa.h.
	(get_parm_default_def_partitions): Remove extern keyword.
	(get_undefined_value_partitions): New function.
	* expr.c (expand_expr_real_1) <expand_decl_rtl>: For a SSA_NAME, do
	not set SUBREG_PROMOTED_VAR_P on the sub-register if it may contain
	uninitialized bits.
	* loop-iv.c (iv_get_reaching_def): Disqualify all subregs.

From-SVN: r253530

1 files changed, 2 insertions, 0 deletions

diff --git a/gcc/tree-outof-ssa.c b/gcc/tree-outof-ssa.c
index 0ce6c15..6327c07 100644
--- a/gcc/tree-outof-ssa.c
+++ b/gcc/tree-outof-ssa.c
@@ -969,6 +969,7 @@ remove_ssa_form (bool perform_ter, struct ssaexpand *sa)
   sa->map = map;
   sa->values = values;
   sa->partitions_for_parm_default_defs = get_parm_default_def_partitions (map);
+  sa->partitions_for_undefined_values = get_undefined_value_partitions (map);
 }
 
 
@@ -1144,6 +1145,7 @@ finish_out_of_ssa (struct ssaexpand *sa)
     BITMAP_FREE (sa->values);
   delete_var_map (sa->map);
   BITMAP_FREE (sa->partitions_for_parm_default_defs);
+  BITMAP_FREE (sa->partitions_for_undefined_values);
   memset (sa, 0, sizeof *sa);
 }