Graph Transformations

Functions
void	local_optimize_node (ir_node *n)
	Applies local optimizations (see iropt.h) to all nodes reachable from node n.
ir_node *	optimize_node (ir_node *n)
	Applies local optimizations to a single node.
void	local_optimize_graph (ir_graph *irg)
	Applies local optimizations (see iropt.h) to all nodes in the graph.
void	optimize_graph_df (ir_graph *irg)
	Applies local optimizations (see iropt.h) to all nodes in the graph.
void	local_opts_const_code (void)
	Perform local optimizations on nodes on const code irg.
void	remove_unreachable_code (ir_graph *irg)
	Eliminates (obviously) unreachable code.
void	remove_bads (ir_graph *irg)
	Removes all Bad nodes from a graph.
void	remove_tuples (ir_graph *irg)
	Removes all Tuple nodes from a graph.
void	remove_critical_cf_edges (ir_graph *irg)
	Places an empty basic block on critical control flow edges thereby removing them.
void	remove_critical_cf_edges_ex (ir_graph *irg, int ignore_exception_edges)
	Places an empty basic block on critical control flow edges thereby removing them.

Detailed Description

Function Documentation

local_optimize_graph()

void local_optimize_graph

(

ir_graph *

irg

)

Applies local optimizations (see iropt.h) to all nodes in the graph.

Parameters

irg	The graph to be optimized.

After applying local_optimize_graph() to a IR-graph, Bad nodes only occur as predecessor of Block and Phi nodes.

local_optimize_node()

void local_optimize_node

(

ir_node *

n

)

Applies local optimizations (see iropt.h) to all nodes reachable from node n.

Parameters

n	The node to be optimized.

local_opts_const_code()

void local_opts_const_code

(

void

)

Perform local optimizations on nodes on const code irg.

optimize_graph_df()

void optimize_graph_df

(

ir_graph *

irg

)

Applies local optimizations (see iropt.h) to all nodes in the graph.

After applying optimize_graph_df() to a IR-graph, Bad nodes only occur as predecessor of Block and Phi nodes.

This version uses fixpoint iteration.

Parameters

irg	The graph to be optimized.

optimize_node()

ir_node * optimize_node

(

ir_node *

n

)

Applies local optimizations to a single node.

Node constructors call this function, so you should not need to call this manually.

remove_bads()

void remove_bads

(

ir_graph *

irg

)

Removes all Bad nodes from a graph.

Parameters

irg	The graph to be optimized.

remove_critical_cf_edges()

void remove_critical_cf_edges

(

ir_graph *

irg

)

Places an empty basic block on critical control flow edges thereby removing them.

A critical control flow edge is an edge from a block with several control exits to a block with several control entries (See Muchnic p. 407). Exception edges are always ignored.

Parameters

irg

IR Graph

remove_critical_cf_edges_ex()

void remove_critical_cf_edges_ex	(	ir_graph *	irg,
		int	ignore_exception_edges )

Places an empty basic block on critical control flow edges thereby removing them.

A critical control flow edge is an edge from a block with several control exits to a block with several control entries (See Muchnic p. 407).

Parameters

irg	IR Graph
ignore_exception_edges	if non-zero, exception edges will be ignored

remove_tuples()

void remove_tuples

(

ir_graph *

irg

)

Removes all Tuple nodes from a graph.

Parameters

irg	The graph to be optimized.

remove_unreachable_code()

void remove_unreachable_code

(

ir_graph *

irg

)

Eliminates (obviously) unreachable code.