Trim down memory usage in alias.c

[Andreas Jaeger]

Jan Hubicka <jh@suse.cz> writes:

> Hi,
> this trick reduces amount of memory allocated by that ggc_alloc call
> from 31MB to 800Kb for Gerald's testcase and 256MB system.
>
> Fulltesting is still in progress (I've killed it by accident), OK if it
> passes?
>
> Honza
>
> 	* alias.c (old_reg_base_value, old_reg_base_value_size): New global variables.
> 	(init_alias_analysis): Reuse existing array if available.
> 	
> Index: alias.c
> ===================================================================
> RCS file: /cvs/gcc/gcc/gcc/alias.c,v
> retrieving revision 1.210
> diff -c -3 -p -r1.210 alias.c
> *** alias.c	17 Jan 2004 09:31:29 -0000	1.210
> --- alias.c	20 Jan 2004 20:32:36 -0000
> *************** static GTY((length ("reg_base_value_size
> *** 161,166 ****
> --- 161,172 ----
>   static rtx *new_reg_base_value;
>   static unsigned int reg_base_value_size; /* size of reg_base_value array */
>   
> + /* We preserve the copy of old array around to avoid amount of garbage
> +    produced.  About 8% of garbage produced were attributed to this
> +    array.  */
> + static GTY((deletable (""))) rtx *old_reg_base_value;
> + static unsigned int old_reg_base_value_size;

Should we really use int?  I thought that size_t would be more
appropriate or is this not possible to do?

Andreas
-- 
 Andreas Jaeger, aj@suse.de, http://www.suse.de/~aj
  SuSE Linux AG, Maxfeldstr. 5, 90409 Nürnberg, Germany
   GPG fingerprint = 93A3 365E CE47 B889 DF7F  FED1 389A 563C C272 A126
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