how many arithmetic operation cufft performs?
I need to calculate gflops of cufft forward and inverse algorithm . 

I have : 

    double gflops = 1.0e-9 * dNumOps/gpuTime;

but I don't know how set dNumOps , I need to know total operations of cufft forward and inverse.

I remember that fft usually have a N*logr(N) operations where r is the number of dataset division in fft, but for cufft ?
how many arithmetic operation cufft performs?
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I need to calculate gflops of cufft forward and inverse algorithm . 

I have : 

    double gflops = 1.0e-9 * dNumOps/gpuTime;

but I don't know how set dNumOps , I need to know total operations of cufft forward and inverse.

I remember that fft usually have a N*logr(N) operations where r is the number of dataset division in fft, but for cufft ?