Convert ACCUMULATE_OUTGOING_ARGS to an expression.

	* calls.c (PUSH_ARGS_REVERSED) Change to expression.
	(ACCUMULATE_OUTGOING_ARGS, PUSH_ARGS): Provide default value.
	(struct arg_data): Remove #ifdef ACCUMULATE_OUTGOING_ARGS.
	(save_fixed_argument_area, restore_fixed_argument_area):
	conditionize by #ifdef REG_PARM_STACK_SPACE only.
	(emit_call): Change #ifdefs on ACCUMULATE_OUTGOING_ARGS
	to conditions, handle RETURN_POPS_ARGS on ACCUMULATE_OUTGOING_ARGS.
	(precompute_register_parameters): Avoid #ifdefs on
	ACCUMULATE_OUTGOING_ARGS and PUSH_ARGS_REVERSED.
	(stire_one_args): Likewise.
	(expand_call): Likewise; conditionize PUSH_ROUNDING code by PUSH_ARGS.
	(emit_library_call_value_1): Likewise.
	(compute_argument_block_size): Align to STACK_BOUNDARY only for
	ACCUMULATE_OUTGOING_ARGS.
	* combine.c (ACCUMULATE_OUTGOING_ARGS, PUSH_ARGS): Provide default
	value.
	(nonzero_bits): Conditionize PUSH_ROUNDING code by USE_PUSH.
	(use_crosses_set_p): Likewise.
	* all targets (ACCUMULATE_OUTGOING_ARGS define): Change to
	#define ACCUMULATE_OUTGOING_ARGS 1.
	* i386.c (ix86_compute_frame_size): Handle ACCUMULATE_OUTGOING_ARGS
	frames.
	* i386.h (MASK_NO_PUSH_ARGS, MASK_ACCUMULATE_OUTGOING_ARGS): New
	constants.
	(TARGET_PUSH_ARGS, TARGET_ACCUMULATE_OUTGOING_ARGS): New macros.
	(TARGET_SWITCHES): Add push-args, no-push-args,
	accumulate-outgoing-args and no-accumulate-outgoing-args.
	(ACCUMULATE_OUTGOING_ARGS, PUSH_ARGS): New macro.
	* expr.c (ACCUMULATE_OUTGONG_ARGS, PUSH_ARGS): Provide default.
	(push_block): Avoid ifdefs on ACCUMULATE_OUTGONG_ARGS
	and PUSH_ROUNDING.
	(emit_push_insn): Likewise.
	* final.c (ACCUMULATE_OUTGOING_ARGS): Provide default.
	(final_scan_insn): Avoid ifdefs on ACCUMULATE_OUTGOING_ARGS.
	* function.c (ACCUMULATE_OUTGOING_ARGS): Provide default.
	(STACK_DYNAMIC_OFFSET): Define correctly for both
	ACCUMULATE_OUTGOING_ARGS and normal mode.
	* invoke.texi (-mpush_args, -maccumulate-outgoing-args): Document.
	* tm.texi (PUSH_ARGS): Document.
	(ACCUMULATE_OUTGOING_ARGS, PUSH_ROUNDING): Update documentation.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@32803 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 16 insertions, 7 deletions

diff --git a/gcc/tm.texi b/gcc/tm.texi
index 803e014dc3d..dac89115101 100644
--- a/gcc/tm.texi
+++ b/gcc/tm.texi
@@ -2630,15 +2630,24 @@ errors in certain cases of mismatch, it also makes for better
 code on certain machines.  If the macro is not defined in target
 header files, it defaults to 0.
 
+@findex PUSH_ARGS
+@item PUSH_ARGS
+A C expression. If nonzero, push insns will be used to pass
+outgoing arguments.
+If the target machine does not have a push instruction, set it to zero.
+That directs GCC to use an alternate strategy: to
+allocate the entire argument block and then store the arguments into
+it.  When PUSH_ARGS is nonzero, PUSH_ROUNDING must be defined too.
+On some machines, the definition
+
+@findex PUSH_ROUNDING
+@item PUSH_ROUNDING (@var{npushed})
+A C expression that is the number of bytes actually pushed onto the
+stack when an instruction attempts to push @var{npushed} bytes.
 @findex PUSH_ROUNDING
 @item PUSH_ROUNDING (@var{npushed})
 A C expression that is the number of bytes actually pushed onto the
 stack when an instruction attempts to push @var{npushed} bytes.
-
-If the target machine does not have a push instruction, do not define
-this macro.  That directs GCC to use an alternate strategy: to
-allocate the entire argument block and then store the arguments into
-it.
 
 On some machines, the definition
 
@@ -2658,13 +2667,13 @@ alignment.  Then the definition should be
 @findex ACCUMULATE_OUTGOING_ARGS
 @findex current_function_outgoing_args_size
 @item ACCUMULATE_OUTGOING_ARGS
-If defined, the maximum amount of space required for outgoing arguments
+A C expression. If nonzero, the maximum amount of space required for outgoing arguments
 will be computed and placed into the variable
 @code{current_function_outgoing_args_size}.  No space will be pushed
 onto the stack for each call; instead, the function prologue should
 increase the stack frame size by this amount.
 
-Defining both @code{PUSH_ROUNDING} and @code{ACCUMULATE_OUTGOING_ARGS}
+Setting both @code{PUSH_ARGS} and @code{ACCUMULATE_OUTGOING_ARGS}
 is not proper.
 
 @findex REG_PARM_STACK_SPACE