[middle-end, patch 4/8] Add compiler a option to turn on indirect inlining

[Martin Jambor <mjambor at suse dot cz>]

This patch adds an option to turn on inlining of indirect calls.  The
option is also automatically on for when compiling with -O3.

I have added documentation of the new option to this patch.


2008-07-15  Martin Jambor  <mjambor@suse.cz>

	* doc/invoke.texi (Optimize options): Add description of
	-fearly-inlining.

	* common.opt (flag_indirect_inlining): New flag.

	* opts.c (decode_options): Set flag_indirect_inlining when 
	optimize >= 3



Index: iinln/gcc/common.opt
===================================================================
--- iinln.orig/gcc/common.opt
+++ iinln/gcc/common.opt
@@ -571,6 +571,10 @@ finhibit-size-directive
 Common Report Var(flag_inhibit_size_directive)
 Do not generate .size directives
 
+findirect-inlining
+Common Report Var(flag_indirect_inlining)
+Perform indirect inlining
+
 ; Nonzero means that functions declared `inline' will be treated
 ; as `static'.  Prevents generation of zillions of copies of unused
 ; static inline functions; instead, `inlines' are written out
Index: iinln/gcc/opts.c
===================================================================
--- iinln.orig/gcc/opts.c
+++ iinln/gcc/opts.c
@@ -944,6 +944,7 @@ decode_options (unsigned int argc, const
     {
       flag_predictive_commoning = 1;
       flag_inline_functions = 1;
+      flag_indirect_inlining = 1;
       flag_unswitch_loops = 1;
       flag_gcse_after_reload = 1;
       flag_tree_vectorize = 1;
Index: iinln/gcc/doc/invoke.texi
===================================================================
--- iinln.orig/gcc/doc/invoke.texi
+++ iinln/gcc/doc/invoke.texi
@@ -328,8 +328,8 @@ Objective-C and Objective-C++ Dialects}.
 -fearly-inlining -fexpensive-optimizations -ffast-math @gol
 -ffinite-math-only -ffloat-store -fforward-propagate @gol
 -ffunction-sections -fgcse -fgcse-after-reload -fgcse-las -fgcse-lm @gol
--fgcse-sm -fif-conversion -fif-conversion2 -finline-functions @gol
--finline-functions-called-once -finline-limit=@var{n} @gol
+-fgcse-sm -fif-conversion -fif-conversion2 -findirect-inlining @gol
+-finline-functions -finline-functions-called-once -finline-limit=@var{n} @gol
 -finline-small-functions -fipa-cp -fipa-marix-reorg -fipa-pta @gol 
 -fipa-pure-const -fipa-reference -fipa-struct-reorg @gol
 -fipa-type-escape -fivopts -fkeep-inline-functions -fkeep-static-consts @gol
@@ -5221,9 +5221,10 @@ invoking @option{-O2} on programs that u
 @item -O3
 @opindex O3
 Optimize yet more.  @option{-O3} turns on all optimizations specified by
-@option{-O2} and also turns on the @option{-finline-functions},
-@option{-funswitch-loops}, @option{-fpredictive-commoning},
-@option{-fgcse-after-reload} and @option{-ftree-vectorize} options.
+@option{-O2} and also turns on the @option{-findirect-inlining},
+@option{-finline-functions}, @option{-funswitch-loops},
+@option{-fpredictive-commoning}, @option{-fgcse-after-reload} and
+@option{-ftree-vectorize} options.
 
 @item -O0
 @opindex O0
@@ -5323,6 +5324,16 @@ in this way.
 
 Enabled at level @option{-O2}.
 
+@item -findirect-inlining
+@opindex findirect-inlining
+Inline also indirect calls that are discovered to be known at compile
+time thanks to previous inlining.  This option has any effect only
+when inlining itself is turned on by the @option{-finline-functions}
+option (as opposed to early inlining which is not enough to make this
+work).
+
+Enabled at level @option{-O3}.
+
 @item -finline-functions
 @opindex finline-functions
 Integrate all simple functions into their callers.  The compiler

--