factor

Author	SHA1	Message	Date
Slava Pestov	d0c393aa60	compiler.cfg: new system to track when results of analyses need to be recomputed (reverse post order, linear order, predecessors, dominance, loops). Passes can now call needs-predecessors, needs-dominance, needs-loops at the beginning, and cfg-changed, predecessors-changd at the end. Linearization order now takes loop nesting into account, and linear scan now uses linearization order instead of RPO.	2009-08-08 20:02:56 -05:00
Slava Pestov	747a2d72c8	compiler.cfg.empty-blocks: new pass to delete empty blocks, runs after phi elimination	2009-07-23 18:02:46 -05:00