Removal of Return with Depressed Stack Pointer support

	Removal of Return with Depressed Stack Pointer support
	* tree.h (TYPE_RETURNS_STACK_DEPRESSED): Delete.
	(ECF_SP_DEPRESSED): Likewise.
	(ECF_LIBCALL_BLOCK, ECF_NOVOPS): Adjust.
	* calls.c (emit_call_1): Do not test ECF_SP_DEPRESSED.
	(flags_from_decl_or_type): Do not test TYPE_RETURNS_STACK_DEPRESSED.
	(expand_call): Do not test ECF_SP_DEPRESSED.
	* dse.c (dse_step0): Do not test TYPE_RETURNS_STACK_DEPRESSED.
	* function.c (keep_stack_depressed): Delete.
	(handle_epilogue_set): Likewise.
	(update_epilogue_consts): Likewise.
	(emit_equiv_load): Likewise.
	(thread_prologue_and_epilogue_insns): Remove support for Return with
	Depressed Stack Pointer.
	* print-tree.c (print_node): Do not test TYPE_RETURNS_STACK_DEPRESSED.

ada/
	* gigi.h (create_subprog_type): Remove returns_with_dsp parameter.
	* decl.c (gnat_to_gnu_entity): Adjust for above new prototype.
	* utils.c (create_subprog_type): Remove returns_with_dsp parameter.
	* trans.c (gnat_to_gnu) <N_Return_Statement>: Remove code dealing with
	Return by Depressed Stack Pointer.

From-SVN: r133976

1 files changed, 3 insertions, 9 deletions

diff --git a/gcc/dse.c b/gcc/dse.c
index 696b2d8..d5db628 100644
--- a/gcc/dse.c
+++ b/gcc/dse.c
@@ -522,11 +522,8 @@ struct clear_alias_mode_holder
 
 static alloc_pool clear_alias_mode_pool;
 
-/* This is true except for two cases:
-   (1) current_function_stdarg -- i.e. we cannot do this 
-       for vararg functions because they play games with the frame.  
-   (2) In ada, it is sometimes not safe to do assume that any stores
-       based off the stack frame go dead at the exit to a function.  */
+/* This is true except if current_function_stdarg -- i.e. we cannot do
+   this for vararg functions because they play games with the frame.  */
 static bool stores_off_frame_dead_at_return;
 
 /* Counter for stats.  */
@@ -712,10 +709,7 @@ dse_step0 (void)
   bb_table = XCNEWVEC (bb_info_t, last_basic_block);
   rtx_group_next_id = 0;
 
-  stores_off_frame_dead_at_return = 
-    (!(TREE_CODE (TREE_TYPE (current_function_decl)) == FUNCTION_TYPE
-       && (TYPE_RETURNS_STACK_DEPRESSED (TREE_TYPE (current_function_decl)))))
-    && (!current_function_stdarg);
+  stores_off_frame_dead_at_return = !current_function_stdarg;
 
   init_alias_analysis ();