cuFFT Question

[Anis]

Is it safe to use idata as the input and output parameter; any difference in results

cufftComplex *idata;

cudaMalloc((void**)&idata, sizeof(cufftComplex)*NX*NY);

/* Create a 2D FFT plan. */

cufftPlan2d(&plan, NX, NY, CUFFT_C2C);

/* Use the CUFFT plan to transform the signal out of place. */

cufftExecC2C(plan, idata, idata, CUFFT_FORWARD);

[mfatica]

Yes, it is safe, it is called an in-place transform.

[Anis]

thanks.

An in-place transform is one in which the output data overwrite the input data. It thus requires half as much memory as–and is often faster than–its opposite, an out-of-place transform.