#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "tree.h"
#include "rtl.h"
#include "regs.h"
#include "expr.h"
#include "tree-pass.h"
#include "basic-block.h"
#include "flags.h"
#include "output.h"
#include "df.h"

Include dependency graph for stack-ptr-mod.c:

Functions
static void	notice_stack_pointer_modification_1 (rtx x, const_rtx pat, void *data)
static void	notice_stack_pointer_modification ()
static unsigned int	rest_of_handle_stack_ptr_mod ()
rtl_opt_pass *	make_pass_stack_ptr_mod ()

Function Documentation

rtl_opt_pass* make_pass_stack_ptr_mod ( )

static void notice_stack_pointer_modification ( )

static

 Assume that the stack pointer is unchanging if alloca hasn't
 been used.

             Check if insn modifies the stack pointer.

 The value coming into this pass was 0, and the exit block uses
 are based on this.  If the value is now 1, we need to redo the
 exit block uses.

References crtl, INSN_P, note_stores(), notice_stack_pointer_modification_1(), NULL, and PATTERN.

static void notice_stack_pointer_modification_1	(	rtx	x,
		const_rtx	pat,
		void *	data
	)

static

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version.

GCC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with GCC; see the file COPYING3. If not see http://www.gnu.org/licenses/. Determine if the stack pointer is constant over the life of the function. Only useful before prologues have been emitted.

The stack pointer is only modified indirectly as the result of a push until later. See the comments in rtl.texi regarding Embedded Side-Effects on Addresses.

References crtl, GET_CODE, GET_RTX_CLASS, MEM_P, RTX_AUTOINC, stack_pointer_rtx, and XEXP.

Referenced by notice_stack_pointer_modification().

static unsigned int rest_of_handle_stack_ptr_mod ( )

static

Some targets can emit simpler epilogues if they know that sp was not ever modified during the function. After reload, of course, we've already emitted the epilogue so there's no sense searching.

References OPTGROUP_NONE, RTL_PASS, and TV_NONE.

Functions

Function Documentation