Dear all,
Is gcc-help the right place to ask such a question ? If not, can you please
tell me where to post it ?
Cheers,
Florent
On Tue, May 13, 2014 at 06:09:29PM +0200, Florent Hivert wrote:
> Dear all,
>
> I extremely happy to have the new GCC 4.9 support the CilkPlus extension. It
> is both very powerful and extremely simple to use. However, I've hit what I
> suspect is a bug, but before filing a bug report, I'd like to check that this
> is not due to some internal I don't know about. Consider the following code
>
> __attribute__ ((always_inline)) inline int get() { return 1; }
>
> void Bar() {
> if (get() == 0) _Cilk_spawn Bar();
> }
>
> int main(int argc, char **argv) {
> Bar();
> }
>
> It compile without any problem with the following fake Cilk command
> /opt/gcc-4.9.0/bin/g++ -D_Cilk_spawn='' inl.cpp
> But when compiled with a genuine Cilk
> /opt/gcc-4.9.0/bin/g++ -fcilkplus inl.cpp
> I got the following error message:
>
> nl.cpp: In function ‘void Bar()’:
> inl.cpp:4:44: error: inlining failed in call to always_inline ‘int get()’: function not inlinable
> __attribute__ ((always_inline)) inline int get() { return 1; }
> ^
> inl.cpp:7:11: error: called from here
> if (get() == 0) _Cilk_spawn Bar();
>
> So my question is: Is it a genuine bug and I should file a report, or is there
> an internal of the Cilk spawned function which prevent inlining.
>
> For the info, I found that problem noticing that indexed access to C++11
> std::array (ie std::array::operator[](size_type)) wasn't inlined
> causing a large performance degradation to my code.
>
> Cheers,
>
> Florent Hivert
--
Florent Hivert
---
Il y a trois sortes de gens dans le monde : ceux qui savent compter et
ceux qui ne savent pas.
There are three kinds of people in the world: those who can count,
and those who cannot.
---
Professeur, LRI, Univ. Paris Sud 11, CNRS.
Responsable Master 2 CCI
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