Re: [PATCH PR45098, 5/10] Bound cost

[Zdenek Dvorak <rakdver@kam.mff.cuni.cz>]

Hi,

> Resubmitting with comment.
> 
> This improves the estimation of cost of bound calculation:
> - It tries to estimate whether an ssa_name can be used in the loop
>   at zero cost, or whether a regcopy is needed to keep the ssa_name
>   alive during the loop, and counts the cost of the regcopy.
> - It adjusts the cost of a complex loop bound: if a complex loop bound
>   uses more that 1 invariant, it is counted as a new single invariant.
> - It estimates the cost of an int bound at zero.
> 
> 2011-05-05  Tom de Vries  <tom@codesourcery.com>
> 
> 	PR target/45098
> 	* tree-ssa-loop-ivopts.c (get_expr_id): Factored new function out of
> 	get_loop_invariant_expr_id.
> 	(get_loop_invariant_expr_id): Use get_expr_id.
> 	(parm_decl_cost): New function.
> 	(determine_use_iv_cost_condition): Use get_expr_id and parm_decl_cost.
> 	Improve bound cost estimation.  Use different inv_expr_id for elim and
> 	express cases.

OK,

Zdenek