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.
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
