topic Yes, this looks like a bug in in Software Archive

cilk_spawn inside cilk_for

Meir_F_ — Fri, 01 Aug 2014 16:20:19 GMT

Hi,

For some reason, whenever I have a spawn and sync inside a cilk_for it seems as though the spawn does not get recognized. I end up getting a compile time error of Expected _Cilk_spawn before _Cilk_sync. As an example consider the following (overly simple) program:

void foo(){
    cout << "foo";
}

void bar(){
    cout << "bar";
}

void baz(){
    cout << "baz";
}

int main(){
    cilk_for(int i-0; i<10; i++){
        cilk_spawn foo();
        bar();
        cilk_sync;
        baz();
    }
}

If I try to compile this I get the above mentioned error. Does anyone have any idea as to why this might be happening and/or how I can solve it. (If I move the spawn and sync into a separate helper method it solves the problem, but unfortunately in my real use case it would mean passing a lot of variables by pointer.) I am using g++ 4.8.1 with cilkplus.

Thanks!

- Meir

It's a bug in the gcc

ARCH_R_Intel — Mon, 04 Aug 2014 21:02:35 GMT

It's a bug in the gcc implementation. icc compiled it without complaint (after I fixed the "int i-0" typo and added the obvious includes/using). I'll try to get this reported to the code maintainer.

Yes, this looks like a bug in

Igor_Z_Intel — Wed, 06 Aug 2014 09:49:00 GMT

Yes, this looks like a bug in GCC's Cilkplus branch. Unfortunately there are no plans to support separate branches anymnore since now we are integrating Cilk_for support into the GCC trunk (it will be version 5.0) thus all Cilk+ features will be there together. Of course, we will make sure that given test works in the trunk after we finish integration