Gcc's man page says:
-finline-functions-called-once
Consider all "static" functions called once for inlining into
their caller even if they are not marked "inline". If a call
to a given function is integrated, then the function is not
output as assembler code in its own right.
Enabled at levels -O1, -O2, -O3 and -Os.
Now, when using -flto -fwhole-program, *all* functions (that the user
provided) will be "static inline", no ? - so *all* functions only called
once in that program will be inlined ?
I am asking because our most important programs often consist of a chain
of "routines-that-do-all-the-work" which are all only called once.
However, in general they are (certainly when viewed from the perspective
of a C programmer) *huge*.
E.g., our forecast program:
HLPROG (small "main" program)
|
| calls
V
GEMINI (read input files, write output files, and:)
|
V
SL2TIM (time stepping, and:)
|
V
PHCALL (subgrid scale computations)
|
V
PHTASK (split them into tasks over model domain)
|
V
PHYS (actually hand out the work to:)
|
----------------------
| | | | |
LSP CVP RADIA TURB SOIL
(large scale precipitation, convective precipitation,
radiation, turbulence, soil processes)
The last five are each around 2,000 lines of Fortran, the P
routines are each several hundreds of lines, as is SL2TIM. GEMINI is
more than 2,000 lines.
My question is: How can I be sure that all of them are integrated (note
that the man page says they are "considered") ? Does -Winline help here
? Perhaps I should scan the assembler output (HAH!).
Kind regards,
--
Toon Moene - e-mail: t...@moene.org - phone: +31 346 214290
Saturnushof 14, 3738 XG Maartensdijk, The Netherlands
At home: http://moene.org/~toon/
Progress of GNU Fortran: http://gcc.gnu.org/gcc-4.5/changes.html
