This is the mail archive of the
mailing list for the GCC project.
Re: problems with optimisation
David Brown wrote:
> With -Os, the compiler will obey normal "inline" directives (at least,
> that is my experience when compiling C on the avr - I have not tried C++
> much on it). It won't do any automatic extra inlining, except for
> static functions that are only used once - which are always inlined as
> this saves space. Again, I don't know how that plays with template
> functions or other C++ features.
> As far as I know, gcc uses weighting heuristics to decide whether to do
> something the rcall you mentioned above, compared to using the inlined
> code directly. It is certainly not impossible that the weightings are
> not optimal here.
> There is currently very little use of C++ with avr-gcc. The avr port
> maintainers and the avrlibc developers have little experience with C++,
> and feel they have enough to do with just the C support. But there are
> a few people on the avr-gcc mailing list that work with C++, and it is
> certainly worth posting there too - they may be able to give suggestions.
I see, thx, I'll try there