> 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 <tejohn...@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 | tejohn...@google.com | 408-460-2413
