comment precising need to use free_dominance_info

Message ID
State New
Headers show

Commit Message

Pierre Vittet May 17, 2011, 2:10 p.m.
So maybe this patch adding a comment on calculate_dominance_info is more 

2011-05-17  Pierre Vittet<>

	* dominance.c (calculate_dominance_info): Add comment
	   precising when to free with free_dominance_info

contributor number: 634276


Index: gcc/dominance.c
--- gcc/dominance.c	(revision 173830)
+++ gcc/dominance.c	(working copy)
@@ -628,8 +628,15 @@  compute_dom_fast_query (enum cdi_direction dir)
 /* The main entry point into this module.  DIR is set depending on whether
-   we want to compute dominators or postdominators.  */
+   we want to compute dominators or postdominators.  
+   We try to keep dominance info alive as long as possible (to avoid
+   recomputing it often). It has to be freed with free_dominance_info when CFG
+   transformation makes it invalide. 
+   post_dominance info is less often used, and should be freed after each use.
 calculate_dominance_info (enum cdi_direction dir)