Out Of SSA Rewrite - Coalesce hash table patch - checked in

Andrew MacLeod amacleod@redhat.com
Thu Nov 30 21:41:00 GMT 2006


-------- Forwarded Message --------
> From: Andrew MacLeod <amacleod@redhat.com>
> To: gcc-patches <gcc-patches@gcc.gnu.org>
> Subject: Out Of SSA Rewrite - Coalesce hash table patch
> Date: Tue, 21 Nov 2006 13:55:37 -0500
> 
>   This patch changes the coalesce list from a linked list representation
> to a hash table implementation.  Nothing particularly fascinating or
> interesting.  I fooled around with numerous hash functions, and this one
> seems to work as well/better than most. 
> 
>   bootstrapped and regression tested on i686-pc-linux-gnu.
> 

Re-bootstrapped with mainline on i686-pc-linux-gnu, and just checked in.

> 
> 	* tree-ssa-live.c (create_coalesce_list): Create a hash table.
> 	(COALESCE_HASH_FN): New.  Define hash function.
> 	(partition_pair_map_hash): New.  Hash value for a partition pair.
> 	(partition_pair_map_eq): New.  Equality for hash pairs.
> 	(create_coalesce_list): Create hash table.
> 	(delete_coalesce_list): Free hash table.
> 	(find_partition_pair): Find/create pairs in hash table.
> 	(compare_pairs):  Sort pairs in ascending order now.
> 	(num_coalesce_pairs): New.  Number of pairs in hash table.
> 	(struct partition_pair_iterator): Iterator struct for pair table.
> 	(first_partition_pair): Iterator function for first pair.
> 	(end_partition_pair_p): Iterator function for end of iteration.
> 	(next_partition_pair): Iterator function for next pair.
> 	(FOR_EACH_PARTITION_PAIR): Macro for iterating over pairs.
> 	(sort_coalesce_list): Sort pairs from hash table into an array.
> 	(pop_best_coalesce): Take pairs from the array.
> 	(dump_coalesce_list): Update to use hash table or sorted array.
> 	* tree-ssa-live.h (struct partition_pair_d): Remove next field.
> 	(struct coalesce_list_d): Add hash table related fields.
> 
> 
> 



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