Re: Flow graph cleanup, version 2

[Jeffrey A Law <law at cygnus dot com>]

  In message <Pine.GSO.4.02A.9810261348060.29793-100000@colt.informatik.rwth-aa
chen.de>you write:
  > 	* flow.c (XNMALLOC): New macro.
  > 	(flow_int_list_blocks, basic_block_succ, basic_block_pred): New
  > 	static variables.
  > 	(add_edge, add_edge_to_label): New static functions.
  > 	(free_bb_memory): New function.
  > 	(flow_delete_insn): Delete function.
  > 	(basic_block_drops_in): Delete variable.
  > 	(find_basic_blocks): Allocate and initialize basic_block_head,
  > 	basic_block_succ.  Don't allocate basic_block_drops_in.
  > 	Call free_bb_memory at the beginning.
  > 	(find_basic_blocks_1): Don't do multiple passes.
  > 	Delete code to compute basic_block_drops_in.
  > 	After calling make_edges, mark blocks reached by current block live.
  > 	Update test for unreachable live blocks.
  > 	(mark_label_ref): Delete args X, CHECKDUP.  Add PRED arg.  All callers
  > 	changed.
  > 	Simplify to call add_edge_to_label when a LABEL_REF is found.
  > 	(make_edges): Simplify to call add_edge_to_label instead of
  > 	mark_label_ref most of the time.
  > 	Compute here whether control drops into the next block.
  > 	(delete_unreachable_blocks): Return void.  All callers changed.
  > 	Delete unreachable blocks in reverse order.
  > 	After deleting all unreachable blocks, renumber the remaining ones
  > 	and update n_basic_blocks.
  > 	(delete_block): Speed up deletion a bit.
  > 	Don't set basic_block_drops_in for deleted blocks.
  > 	(free_basic_block_vars): Don't free basic_block_drops_in.
  > 	(life_analysis_1): Update to use new edge representation.
  > 	(dump_flow_info): Delete code to print basic block info; call
  > 	dump_bb_data instead.
  > 	(compute_preds_succs): Delete code to recompute basic_block_drops_in
  > 	and uid_block_number.
  > 	Simply copy the previously computed cfg.
  > 	(dump_bb_data): New arg LIVE_INFO.  All callers changed.
  > 	Print register lifetime information if LIVE_INFO is nonzero.
  > 
  > 	* basic-block.h (dump_bb_data): Adjust prototype.
  > 	* gcse.c (gcse_main): Update call to dump_bb_data.
  > 	* rtl.h (free_bb_memory): Declare.
  > 	* toplev.c (rest_of_compilation): Call free_bb_memory.
Thanks.  Installed.
jeff