[gcc r12-6984] AutoFDO: don't set param_early_inliner_max_iterations to 10.

[gcc r12-6984] AutoFDO: don't set param_early_inliner_max_iterations to 10.

[Eugene Rozenfeld]

https://gcc.gnu.org/g:c17975d81aaed49ff759c20c68b31304a6953d58

commit r12-6984-gc17975d81aaed49ff759c20c68b31304a6953d58
Author: Eugene Rozenfeld <erozen@microsoft.com>
Date:   Tue Jan 18 16:03:19 2022 -0800

    AutoFDO: don't set param_early_inliner_max_iterations to 10.
    
    param_early_inliner_max_iterations specifies the maximum number
    of nested indirect inlining iterations performed by early inliner.
    Normally, the default value is 1.
    
    For AutoFDO this parameter was also used as the number of iteration for
    its indirect call promotion loop and the default value was set to 10.
    While it makes sense to have 10 in the indirect call promotion loop
    (we want to make the IR match the profiled binary before actual annotation)
    there is no reason to have a special default value for the
    regular early inliner.
    
    This change removes the special AutoFDO default value setting for
    param_early_inliner_max_iterations while keeping 10 as the number of
    iterations for the AutoFDO indirect call promotion loop.
    
    This change improves a simple fibonacci benchmark in AutoFDO mode
    by 15% on x86_64-pc-linux-gnu.
    
    Tested on x86_64-pc-linux-gnu.
    
    gcc/ChangeLog:
            * auto-profile.cc (auto_profile): Hard-code the number of iterations (10).
    
    gcc/ChangeLog:
            * opts.cc (common_handle_option): Don't set param_early_inliner_max_iterations
            to 10 for AutoFDO.

Diff:
---
 gcc/auto-profile.cc | 3 +--
 gcc/opts.cc         | 2 --
 2 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/gcc/auto-profile.cc b/gcc/auto-profile.cc
index 0bfaae7b091..c7cee639c85 100644
--- a/gcc/auto-profile.cc
+++ b/gcc/auto-profile.cc
@@ -1644,8 +1644,7 @@ auto_profile (void)
        function before annotation, so the profile inside bar@loc_foo2
        will be useful.  */
     autofdo::stmt_set promoted_stmts;
-    for (int i = 0; i < opt_for_fn (node->decl,
-				    param_early_inliner_max_iterations); i++)
+    for (int i = 0; i < 10; i++)
       {
         if (!flag_value_profile_transformations
             || !autofdo::afdo_vpt_for_early_inline (&promoted_stmts))
diff --git a/gcc/opts.cc b/gcc/opts.cc
index 7d30deb8e4b..6e2ee821c44 100644
--- a/gcc/opts.cc
+++ b/gcc/opts.cc
@@ -2895,8 +2895,6 @@ common_handle_option (struct gcc_options *opts,
     case OPT_fauto_profile:
       enable_fdo_optimizations (opts, opts_set, value);
       SET_OPTION_IF_UNSET (opts, opts_set, flag_profile_correction, value);
-      SET_OPTION_IF_UNSET (opts, opts_set,
-			   param_early_inliner_max_iterations, 10);
       break;
 
     case OPT_fprofile_generate_: