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Re: [GOOGLE] Increase max-early-inliner-iterations to 2 for profile-gen and use


> Increasing the number of early inliner iterations from 1 to 2 enables more
> indirect calls to be promoted/inlined before instrumentation. This in turn
> reduces the instrumentation overhead, particularly for more expensive indirect
> call topn profiling.

How much difference you get here? One posibility would be also to run specialized
ipa-cp before profile instrumentation.

Honza
> 
> Passes internal testing and regression tests. Ok for google/4_9?
> 
> 2014-10-18  Teresa Johnson  <tejohnson@google.com>
> 
>         Google ref b/17934523
>         * opts.c (finish_options): Increase max-early-inliner-iterations to 2
>         for profile-gen and profile-use builds.
> 
> Index: opts.c
> ===================================================================
> --- opts.c      (revision 216286)
> +++ opts.c      (working copy)
> @@ -870,6 +869,14 @@ finish_options (struct gcc_options *opts, struct g
>          opts->x_param_values, opts_set->x_param_values);
>      }
> 
> +  if (opts->x_profile_arc_flag
> +      || opts->x_flag_branch_probabilities)
> +    {
> +      maybe_set_param_value
> +       (PARAM_EARLY_INLINER_MAX_ITERATIONS, 2,
> +        opts->x_param_values, opts_set->x_param_values);
> +    }
> +
>    if (!(opts->x_flag_auto_profile
>          || (opts->x_profile_arc_flag || opts->x_flag_branch_probabilities)))
>      {
> 
> 
> -- 
> Teresa Johnson | Software Engineer | tejohnson@google.com | 408-460-2413


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