Limit inlining functions called once

as dicussed in PR ipa/103454 there are several benchmarks that regresses
for -finline-functions-called once. Runtmes:
 - tramp3d with -Ofast. 31%
 - exchange2 with -Ofast 11-21%
 - roms O2 9%-10%
 - tonto 2.5-3.5% with LTO
Build times:
 - specfp2006 41% (mostly wrf that builds 71% faster)
 - specint2006 1.5-3%
 - specfp2017 64% (again mostly wrf)
 - specint2017 2.5-3.5%

This patch adds two params to tweak the behaviour:
 1) max-inline-functions-called-once-loop-depth limiting the loop depth
    (this is useful primarily for exchange where the inlined function is in
     loop depth 9)
 2) max-inline-functions-called-once-insns
    We already have large-function-insns/growth parameters, but these are
    limiting also inlining small functions, so reducing them will regress
    very large functions that are hot.

    Because inlining functions called once is meant just as a cleanup pass
    I think it makes sense to have separate limit for it.
gcc/ChangeLog:

2021-12-09  Jan Hubicka  <hubicka@ucw.cz>

	* doc/invoke.texi (max-inline-functions-called-once-loop-depth,
	max-inline-functions-called-once-insns): New parameters.
	* ipa-inline.c (check_callers): Handle
	param_inline_functions_called_once_loop_depth and
	param_inline_functions_called_once_insns.
	(edge_badness): Fix linebreaks.
	* params.opt (param=max-inline-functions-called-once-loop-depth,
	param=max-inline-functions-called-once-insn): New params.

1 files changed, 8 insertions, 0 deletions

diff --git a/gcc/params.opt b/gcc/params.opt
index e725c99..f1b5757 100644
--- a/gcc/params.opt
+++ b/gcc/params.opt
@@ -545,6 +545,14 @@ The maximum expansion factor when copying basic blocks.
 Common Joined UInteger Var(param_max_hoist_depth) Init(30) Param Optimization
 Maximum depth of search in the dominator tree for expressions to hoist.
 
+-param=max-inline-functions-called-once-loop-depth=
+Common Joined UInteger Var(param_inline_functions_called_once_loop_depth) Init(6) Optimization Param
+Maximum loop depth of a call which is considered for inlining functions called once
+
+-param=max-inline-functions-called-once-insns=
+Common Joined UInteger Var(param_inline_functions_called_once_insns) Init(4000) Optimization Param
+Maximum combinaed size of caller and callee wich is inlined if callee is called once.
+
 -param=max-inline-insns-auto=
 Common Joined UInteger Var(param_max_inline_insns_auto) Init(15) Optimization Param
 The maximum number of instructions when automatically inlining.