* function.c (try_fit_stack_local, add_frame_space): New static

	functions.
	(assign_stack_local_1): Use them.  Look for opportunities to use
	space previously wasted on alignment.
	* function.h (struct frame_space): New.
	(struct rtl_data): Add FRAME_SPACE_LIST member.
	* reload1.c (something_was_spilled): New static variable.
	(alter_reg): Set it.
	(reload): Test it in addition to testing if the frame size changed.



git-svn-id: https://gcc.gnu.org/svn/gcc/trunk@159480 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 14 insertions, 0 deletions

diff --git a/gcc/function.h b/gcc/function.h
index e5e03384718..d008e8586ef 100644
--- a/gcc/function.h
+++ b/gcc/function.h
@@ -231,6 +231,17 @@ struct GTY(()) function_subsections {
   const char *unlikely_text_section_name;
 };
 
+/* Describe an empty area of space in the stack frame.  These can be chained
+   into a list; this is used to keep track of space wasted for alignment
+   reasons.  */
+struct GTY(()) frame_space
+{
+  struct frame_space *next;
+
+  HOST_WIDE_INT start;
+  HOST_WIDE_INT length;
+};
+
 /* Datastructures maintained for currently processed function in RTL form.  */
 struct GTY(()) rtl_data {
   struct expr_status expr;
@@ -278,6 +289,9 @@ struct GTY(()) rtl_data {
      Made for the sake of unshare_all_rtl.  */
   rtx x_stack_slot_list;
 
+  /* List of empty areas in the stack frame.  */
+  struct frame_space *frame_space_list;
+
   /* Place after which to insert the tail_recursion_label if we need one.  */
   rtx x_stack_check_probe_note;