/** Applies local optimizations (see iropt.h) to all nodes reachable from node n.
*
- * @param n The node to be optimized. */
+ * @param n The node to be optimized.
+ */
void local_optimize_node(ir_node *n);
/** Applies local optimizations (see iropt.h) to all nodes in the graph.
*
- * @param irg The graph to be optimized. */
+ * @param irg The graph to be optimized.
+ *
+ * After applying local_optimize_graph() to a IR-graph, Bad nodes
+ * only occure as predecessor of Block and Phi nodes.
+ */
void local_optimize_graph (ir_graph *irg);
/** Performs dead node elimination by copying the ir graph to a new obstack.
* Removes old attributes of nodes. Sets link field to NULL.
* Callee information must be freed (irg_callee_info_none).
*
- * Attention: the numbers assigned to nodes if the library is compiled for
- * development/debugging are not conserved by copying.
- *
- * @param irg The graph to be optimized. */
+ * @param irg The graph to be optimized.
+ */
void dead_node_elimination(ir_graph *irg);
+typedef struct _survive_dce_t survive_dce_t;
+
+/**
+ * Make a new Survive DCE environment.
+ */
+survive_dce_t *new_survive_dce(void);
+
+/**
+ * Free a Survive DCE environment.
+ */
+void free_survive_dce(survive_dce_t *sd);
+
+/**
+ * Register a node pointer to be patched upon DCE.
+ * When DCE occurs, the node pointer specified by @p place will be
+ * patched to the new address of the node it is pointing to.
+ *
+ * @param sd The Survive DCE environment.
+ * @param place The address of the node pointer.
+ */
+void survive_dce_register_irn(survive_dce_t *sd, ir_node **place);
+
/** Cleans the control flow from Bad predecesors.
*
* Removes Bad predecesors from Blocks and the corresponding
* inputs to Phi nodes as in dead_node_elimination but without
* copying the graph.
*
+ * Conserves loop information.
+ *
* @param irg The graph to be optimized.
*/
void remove_bad_predecessors(ir_graph *irg);
* current and called graph.
* Assumes that both, the called and the calling graph are in state
* "op_pin_state_pinned".
- * It is recommended to call local_optimize_graph after inlining as this
+ * It is recommended to call local_optimize_graph() after inlining as this
* function leaves a set of obscure Tuple nodes, e.g. a Proj-Tuple-Jmp
* combination as control flow operation.
*
*
* @return zero if method could not be inlined (recursion for instance),
* non-zero if all went ok
-**/
+ */
int inline_method(ir_node *call, ir_graph *called_graph);
/** Inlines all small methods at call sites where the called address comes
- * from a Const node that references the entity representing the called
+ * from a SymConst node that references the entity representing the called
* method.
+ *
* The size argument is a rough measure for the code size of the method:
* Methods where the obstack containing the firm graph is smaller than
* size are inlined. Further only a limited number of calls are inlined.
* inlined.
* Inlining is only performed if flags `optimize' and `inlineing' are set.
* The graph may not be in state phase_building.
- * It is recommended to call local_optimize_graph after inlining as this
+ * It is recommended to call local_optimize_graph() after inlining as this
* function leaves a set of obscure Tuple nodes, e.g. a Proj-Tuple-Jmp
- * combination as control flow operation. */
+ * combination as control flow operation.
+ */
void inline_small_irgs(ir_graph *irg, int size);
-/** Inlineing with a different heuristic than inline_small_irgs.
+/** Inlineing with a different heuristic than inline_small_irgs().
*
* Inlines leave functions. If inlinening creates new leave
* function inlines these, too. (If g calls f, and f calls leave h,
*/
void inline_leave_functions(int maxsize, int leavesize, int size);
-/** Code Placement. Pinns all floating nodes to a block where they
- will be executed only if needed. Depends on the flag opt_global_cse.
- Graph may not be in phase_building. Does not schedule control dead
- code. Uses dominator information which it computes if the irg is not
- in state dom_consistent. Destroys the out information as it moves nodes
- to other blocks. Optimizes Tuples in Control edges.
- @todo This is not tested!
-
- Call remove_critical_cf_edges() before place_code(). This normalizes
- the control flow graph so that for all operations a basic block exists
- where they can be optimally placed.
-
- @todo A more powerful code placement would move operations past Phi nodes
- out of loops. */
-void place_code(ir_graph *irg);
-
-/** Control flow optimization.
- * Removes empty blocks doing if simplifications and loop simplifications.
- * A block is empty if it contains only a Jmp node and Phi nodes.
- * Merges single entry single exit blocks with their predecessor
- * and propagates dead control flow by calling equivalent_node.
- * Independent of compiler flag it removes Tuples from cf edges,
- * Bad predecessors form blocks and unnecessary predecessors of End.
- *
- * @bug So far destroys backedge information.
- * @bug Chokes on Id nodes if called in a certain order with other
- * optimizations. Call local_optimize_graph before to remove
- * Ids.
+/** Code Placement.
+ *
+ * Pins all floating nodes to a block where they
+ * will be executed only if needed. Depends on the flag opt_global_cse.
+ * Graph may not be in phase_building. Does not schedule control dead
+ * code. Uses dominator information which it computes if the irg is not
+ * in state dom_consistent. Destroys the out information as it moves nodes
+ * to other blocks. Optimizes Tuples in Control edges.
+ * @todo This is not tested!
+ *
+ * Call remove_critical_cf_edges() before place_code(). This normalizes
+ * the control flow graph so that for all operations a basic block exists
+ * where they can be optimally placed.
+ *
+ * @todo A more powerful code placement would move operations past Phi nodes
+ * out of loops.
*/
-void optimize_cf(ir_graph *irg);
-
+void place_code(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).
- Is only executed if flag set_opt_critical_edges() is set.
- @param irg IR Graph
-*/
+ * 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).
+ *
+ * @param irg IR Graph
+ */
void remove_critical_cf_edges(ir_graph *irg);
# endif /* _IRGOPT_H_ */
projects / libfirm / blobdiff