Workspace is not required for FFTs of following sizes:

• Powers of 2 up to 32768.

• Powers of 3 up to 19683.

• Powers of 5 up to 15625.

• Powers of 6 up to 7776.

• Powers of 7 up to 16807.

• Powers of 10 up to 10000.

• Powers of 11 up to 1331.

• Powers of 12 up to 1728.

• Powers of 13 up to 2187.

• Powers of 14 up to 2744.

• Powers of 15 up to 3375.

• Powers of 17 up to 4913.

• Powers of 18 up to 5832.

• Powers of 19 up to 6859.

• Powers of 20 up to 8000.

• Powers of 21 up to 9261.

• Powers of 22 up to 10649.

• Powers of 23 up to 12167.

• Powers of 24 up to 13824.

• Powers of 26 up to 17576.

• Powers of 29 up to 21952.

• Powers of 30 up to 27000.

• Powers of 32 up to 29781.

• Factors of 4 lower than 512.

In the future versions of cuFFTDx:

• Workspace requirement may be removed for other configurations.

• FFT configurations that do not require workspace will continue to do so.