what does _global_ mean in the context of a function declaration in c?-CodePudding

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what does _global_ mean in the context of a function declaration in c?

Time：10-02

For example, if I'm declaring a function like so:

_global_ void square(float *d_out, float *d_in);

CodePudding user response：

It is not standard C, only some extension or #define.

It looks like CUDA.

__global__ function is executed on GPU, it can be called from CPU or the GPU.

Calling __global__ functions is often more expensive than __device__.

If it is a #define, compile the file with the -E (gcc) or similar option and see how this macro is expanded.