Assert(false) because Large1DThreshold = 2048 in v2.12.2

[sxleixer]

I recently stumbled upon an error in the binary version of clFFT.

Since 2¹¹ and 2¹³ worked right away, I got an SIGFPE on 2¹².

This made me curious and so I installed the newest version of the library.

To keep things short - I debugged into library/plan.cpp and found out that Large1DThreshold = 2048. Stepping along lead me to line 654 where the case-part was starting with 8192 and thus the assert(false) is thrown.

I assume, that during the release compilation the assertions are turned off yielding this strange error.

[sxleixer]

Adding corresponding lines for both single and double for 4096 respective 2048 fixed the issue.

I'm using 2x NVIDIA NVS 295.