propagate_freq enormous performance hit in 3.1

[Richard Henderson]

On Tue, Aug 14, 2001 at 06:20:20PM +0200, Jan Hubicka wrote:
> 	* predict.c (struct block_info_def): Remove nvisited.
> 	(propagate_freq): Use EDGE_DFS_BACK to detect irreducible regions.
> 	(estimate_bb_frequencies): Call mark_dfs_back_edges.

Ok.


r~