sese.cc File Reference

#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "backend.h"
#include "tree.h"
#include "gimple.h"
#include "cfghooks.h"
#include "tree-pass.h"
#include "ssa.h"
#include "tree-pretty-print.h"
#include "fold-const.h"
#include "gimplify.h"
#include "gimple-iterator.h"
#include "gimple-pretty-print.h"
#include "gimplify-me.h"
#include "tree-cfg.h"
#include "tree-ssa-loop.h"
#include "tree-into-ssa.h"
#include "cfgloop.h"
#include "tree-data-ref.h"
#include "tree-scalar-evolution.h"
#include "tree-ssa-propagate.h"
#include "cfganal.h"
#include "sese.h"

Include dependency graph for sese.cc:

Functions
static void	sese_build_liveouts_use (sese_info_p region, bitmap liveouts, basic_block bb, tree use)
static void	sese_build_liveouts_bb (sese_info_p region, basic_block bb)
static void	sese_reset_debug_liveouts (sese_info_p region)
void	sese_build_liveouts (sese_info_p region)
sese_info_p	new_sese_info (edge entry, edge exit)
void	free_sese_info (sese_info_p region)
static void	sese_add_exit_phis_edge (basic_block exit, tree use, edge false_e, edge true_e)
void	sese_insert_phis_for_liveouts (sese_info_p region, basic_block bb, edge false_e, edge true_e)
class loop *	outermost_loop_in_sese_1 (sese_l &region, basic_block bb)
loop_p	outermost_loop_in_sese (sese_l &region, basic_block bb)
edge	get_true_edge_from_guard_bb (basic_block bb)
edge	get_false_edge_from_guard_bb (basic_block bb)
ifsese	move_sese_in_condition (sese_info_p region)
void	set_ifsese_condition (ifsese if_region, tree condition)
bool	invariant_in_sese_p_rec (tree t, const sese_l &region, bool *has_vdefs)
bool	scev_analyzable_p (tree def, sese_l &region)
tree	scalar_evolution_in_region (const sese_l &region, loop_p loop, tree t)
bool	sese_trivially_empty_bb_p (basic_block bb)
void	print_edge (FILE *file, const_edge e)
void	print_sese (FILE *file, const sese_l &s)
DEBUG_FUNCTION void	debug_edge (const_edge e)
DEBUG_FUNCTION void	debug_sese (const sese_l &s)

Function Documentation

debug_edge()

DEBUG_FUNCTION void debug_edge

(

const_edge

e

)

Pretty print edge E to STDERR.   

References debug_edge(), and print_edge().

Referenced by debug_edge().

debug_sese()

DEBUG_FUNCTION void debug_sese

(

const sese_l &

s

)

Pretty print sese S to STDERR.   

References debug_sese(), and print_sese().

Referenced by debug_sese().

free_sese_info()

void free_sese_info

(

sese_info_p

region

)

Deletes REGION.   

References BITMAP_FREE, free_sese_info(), and NULL.

Referenced by free_sese_info().

get_false_edge_from_guard_bb()

edge get_false_edge_from_guard_bb

(

basic_block

bb

)

Returns the first successor edge of BB with EDGE_TRUE_VALUE flag cleared.   

References FOR_EACH_EDGE, gcc_unreachable, get_false_edge_from_guard_bb(), NULL, and basic_block_def::succs.

Referenced by get_false_edge_from_guard_bb().

get_true_edge_from_guard_bb()

edge get_true_edge_from_guard_bb

(

basic_block

bb

)

Returns the first successor edge of BB with EDGE_TRUE_VALUE flag set.   

References FOR_EACH_EDGE, gcc_unreachable, get_true_edge_from_guard_bb(), NULL, and basic_block_def::succs.

Referenced by get_true_edge_from_guard_bb().

invariant_in_sese_p_rec()

bool invariant_in_sese_p_rec	(	tree	t,
		const sese_l &	region,
		bool *	has_vdefs )

Return true when T is defined outside REGION or when no definitions are
variant in REGION.  When HAS_VDEFS is a valid pointer, sets HAS_VDEFS to true
when T depends on memory that may change in REGION.   

References defined_in_sese_p(), FOR_EACH_SSA_USE_OPERAND, gimple_vdef(), gimple_vuse(), invariant_in_sese_p_rec(), SSA_NAME_DEF_STMT, SSA_OP_USE, and USE_FROM_PTR.

Referenced by invariant_in_sese_p_rec().

move_sese_in_condition()

ifsese move_sese_in_condition

(

sese_info_p

region

)

Moves REGION in a condition expression:
  | if (1)
  |   ;
  | else
  |   REGION;

References CDI_DOMINATORS, dom_info_available_p(), ifsese_s::false_region, find_edge(), gimple_build_cond(), GSI_CONTINUE_LINKING, gsi_insert_after(), gsi_last_bb(), integer_one_node, integer_zero_node, make_edge(), move_sese_in_condition(), NULL_TREE, ifsese_s::region, set_immediate_dominator(), single_pred_edge(), single_succ_edge(), split_edge(), and ifsese_s::true_region.

Referenced by move_sese_in_condition().

new_sese_info()

sese_info_p new_sese_info	(	edge	entry,
		edge	exit )

Builds a new SESE region from edges ENTRY and EXIT.   

References new_sese_info(), and NULL.

Referenced by new_sese_info().

outermost_loop_in_sese()

loop_p outermost_loop_in_sese	(	sese_l &	region,
		basic_block	bb )

Same as outermost_loop_in_sese_1, returns the outermost loop
containing BB in REGION, but makes sure that the returned loop
belongs to the REGION, and so this returns the first loop in the
REGION when the loop containing BB does not belong to REGION.   

References gcc_assert, loop_in_sese_p(), outermost_loop_in_sese(), and outermost_loop_in_sese_1().

Referenced by outermost_loop_in_sese().

outermost_loop_in_sese_1()

class loop * outermost_loop_in_sese_1	(	sese_l &	region,
		basic_block	bb )

Returns the outermost loop in SCOP that contains BB.   

References basic_block_def::loop_father, loop_in_sese_p(), loop_outer(), and outermost_loop_in_sese_1().

Referenced by outermost_loop_in_sese(), and outermost_loop_in_sese_1().

print_edge()

void print_edge	(	FILE *	file,
		const_edge	e )

Pretty print edge E to FILE.   

References print_edge().

Referenced by vect_optimize_slp_pass::dump().

print_sese()

void print_sese	(	FILE *	file,
		const sese_l &	s )

Pretty print sese S to FILE.   

References print_edge(), and print_sese().

Referenced by debug_sese(), and print_sese().

scalar_evolution_in_region()

tree scalar_evolution_in_region	(	const sese_l &	region,
		loop_p	loop,
		tree	t )

Returns the scalar evolution of T in REGION.  Every variable that
is not defined in the REGION is considered a parameter.   

References analyze_scalar_evolution(), defined_in_sese_p(), sese_l::entry, instantiate_scev(), loop_in_sese_p(), NULL, scalar_evolution_in_region(), and TREE_CODE.

Referenced by scalar_evolution_in_region(), and scev_analyzable_p().

scev_analyzable_p()

bool scev_analyzable_p	(	tree	def,
		sese_l &	region )

Return true when DEF can be analyzed in REGION by the scalar
evolution analyzer.   

References chrec_contains_symbols_defined_in_loop(), chrec_contains_undetermined(), defined_in_sese_p(), INTEGRAL_TYPE_P, loop_containing_stmt(), loop_in_sese_p(), loop::num, POINTER_TYPE_P, scalar_evolution_in_region(), scev_analyzable_p(), scev_is_linear_expression(), SSA_NAME_DEF_STMT, TREE_CODE, and TREE_TYPE.

Referenced by scev_analyzable_p().

sese_add_exit_phis_edge()

void sese_add_exit_phis_edge ( basic_block exit, tree use, edge false_e, edge true_e )

static

Add exit phis for USE on EXIT.   

References add_phi_arg(), create_new_def_for(), create_phi_node(), gimple_phi_result_ptr(), NULL_TREE, sese_add_exit_phis_edge(), UNKNOWN_LOCATION, and update_stmt().

Referenced by sese_add_exit_phis_edge(), and sese_insert_phis_for_liveouts().

sese_build_liveouts()

void sese_build_liveouts

(

sese_info_p

region

)

Build the LIVEOUTS of REGION: the set of variables defined inside
and used outside the REGION.   

References bb_in_sese_p(), BITMAP_ALLOC, cfun, FOR_EACH_BB_FN, gcc_assert, NULL, sese_build_liveouts(), and sese_build_liveouts_bb().

Referenced by sese_build_liveouts().

sese_build_liveouts_bb()

void sese_build_liveouts_bb ( sese_info_p region, basic_block bb )

static

Marks for rewrite all the SSA_NAMES defined in REGION and that are
used in BB that is outside of the REGION.   

References FOR_EACH_PHI_ARG, FOR_EACH_SSA_USE_OPERAND, gsi_end_p(), gsi_next(), gsi_start_bb(), gsi_start_phis(), gsi_stmt(), is_gimple_debug(), sese_build_liveouts_bb(), sese_build_liveouts_use(), SSA_OP_USE, and USE_FROM_PTR.

Referenced by sese_build_liveouts(), and sese_build_liveouts_bb().

sese_build_liveouts_use()

void sese_build_liveouts_use ( sese_info_p region, bitmap liveouts, basic_block bb, tree use )

static

Single entry single exit control flow regions.
   Copyright (C) 2008-2026 Free Software Foundation, Inc.
   Contributed by Jan Sjodin <jan.sjodin@amd.com> and
   Sebastian Pop <sebastian.pop@amd.com>.

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/>.   

For a USE in BB, if BB is outside REGION, mark the USE in the
LIVEOUTS set.   

References bb_in_sese_p(), bitmap_set_bit, gcc_assert, gimple_bb(), sese_build_liveouts_use(), SSA_NAME_DEF_STMT, SSA_NAME_VERSION, and TREE_CODE.

Referenced by sese_build_liveouts_bb(), and sese_build_liveouts_use().

sese_insert_phis_for_liveouts()

void sese_insert_phis_for_liveouts	(	sese_info_p	region,
		basic_block	bb,
		edge	false_e,
		edge	true_e )

Insert in the block BB phi nodes for variables defined in REGION
  and used outside the REGION.  The code generation moves REGION in
  the else clause of an "if (1)" and generates code in the then
  clause that is at this point empty:

  | if (1)
  |   empty;
  | else
  |   REGION;

References EXECUTE_IF_SET_IN_BITMAP, i, MAY_HAVE_DEBUG_BIND_STMTS, sese_add_exit_phis_edge(), sese_insert_phis_for_liveouts(), sese_reset_debug_liveouts(), ssa_name, and virtual_operand_p().

Referenced by sese_insert_phis_for_liveouts().

sese_reset_debug_liveouts()

void sese_reset_debug_liveouts ( sese_info_p region )

static

Reset debug stmts that reference SSA_NAMES defined in REGION that
are not marked as liveouts.   

References bb_in_sese_p(), EXECUTE_IF_AND_COMPL_IN_BITMAP, FOR_EACH_IMM_USE_STMT, gimple_bb(), gimple_debug_bind_reset_value(), i, is_gimple_debug(), sese_reset_debug_liveouts(), ssa_name, and update_stmt().

Referenced by sese_insert_phis_for_liveouts(), and sese_reset_debug_liveouts().

sese_trivially_empty_bb_p()

bool sese_trivially_empty_bb_p

(

basic_block

bb

)

Return true if BB is empty, contains only DEBUG_INSNs.   

References gsi_end_p(), gsi_next(), gsi_start_bb(), gsi_stmt(), is_gimple_debug(), and sese_trivially_empty_bb_p().

Referenced by sese_trivially_empty_bb_p().

set_ifsese_condition()

void set_ifsese_condition	(	ifsese	if_region,
		tree	condition )

Replaces the condition of the IF_REGION with CONDITION:
  | if (CONDITION)
  |   true_region;
  | else
  |   false_region;

References force_gimple_operand_gsi_1(), gcc_assert, gimple_build_cond_from_tree(), gsi_insert_before(), gsi_last_bb(), gsi_remove(), GSI_SAME_STMT, is_gimple_condexpr_for_cond(), NULL_TREE, ifsese_s::region, and set_ifsese_condition().

Referenced by set_ifsese_condition().