X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fana%2Fexecution_frequency.h;h=445dedbf077120aa3aedeb53bd0c3df27d8c7f9e;hb=ff0e8d7fcb34481652f0bf521ba04b1eca5e2106;hp=5d88e37e6934237578c4d03161dda795b9c52f8b;hpb=2c6a8fa3e3be84a942fdf9c7f385f61e0f913110;p=libfirm

diff --git a/ir/ana/execution_frequency.h b/ir/ana/execution_frequency.h
index 5d88e37e6..445dedbf0 100644
--- a/ir/ana/execution_frequency.h
+++ b/ir/ana/execution_frequency.h
@@ -22,30 +22,68 @@
  * We assume the start block of a procedure is executed once.  Based on this we
  * compute the execution freqency of all blocks.
  *
- *
+ * The computation of the freqencies depends on the count of exception control
+ * flow computed during the interval analysis.  The interval analysis again
+ * depends on stuff computed here.
  */
 
 #include "irnode.h"
 #include "irgraph.h"
 
+/* A proj from a Cond that goes to an exception handler. */
+int is_fragile_Proj(ir_node *n);
 
 /** Returns the number of times the block/region is executed according to
- *  our estimate. */
-double get_irn_exec_freq(ir_node *n);
+ *  our estimate. Gives a number relative to the Start node of the procedure
+ *  the block is in, which is weighted with 1. */
+double get_irn_exec_freq   (ir_node *n);
 double get_Block_exec_freq (ir_node *b);
 double get_region_exec_freq(void *reg);
 
 /** Compute the execution frequency for all blocks in the given
  *  graph.
  *
- * @param irg                  The graph to be analyzed.
- * @param default_loop_weight  The default number of executions of a loop.
+ * @param irg                   The graph to be analyzed.
+ * @param default_loop_weight   The default number of executions of a loop.
+ * @param exception_probability The probability that a fragile operation causes an exception.
+ *
+ * Uses link field.
  */
 void compute_execution_frequency(ir_graph *irg, int default_loop_weight, double exception_probability);
+
+/** Compute the execution frequency for all graphs.
+ *
+ * @param default_loop_weight   The default number of executions of a loop.
+ * @param exception_probability The probability that a fragile operation causes an exception.
+ *
+ */
 void compute_execution_frequencies(int default_loop_weight, double exception_probability);
 
-/** Free occupied memory, reset. */
+/** Free occupied memory, reset for all graphs. */
 void free_execution_frequency(void);
 
+/** State of execution freqencies for graphs and the whole program.
+ *
+ * The exec_freq_state in irp is consistent, if the state of all graphs is consistent.
+ * It is none, if the state of all graphs is none.  Else it is inconsistent. */
+typedef enum {
+  exec_freq_none,             /**< Execution frequencies are not computed, no memory is
+				   allocated, access fails. */
+  exec_freq_consistent,       /**< Execution frequency information is computed and correct. */
+  exec_freq_inconsistent      /**< Execution frequency is computed but the graph has been
+				   changed since. */
+} exec_freq_state;
+
+exec_freq_state get_irg_exec_freq_state(ir_graph *irg);
+void            set_irg_exec_freq_state(ir_graph *irg, exec_freq_state s);
+/* Sets irg and irp exec freq state to inconsistent if it is set to consistent. */
+void            set_irg_exec_freq_state_inconsistent(ir_graph *irg);
+
+exec_freq_state get_irp_exec_freq_state(void);
+/* Sets irp and all irg exec freq states to inconsistent if it is set to consistent. */
+void            set_irp_exec_freq_state_inconsistent(void);
+
+
+
 
 #endif /* _EXECUTION_FREQUENCY_H_ */