v2.5.0

FINUFFT 2.5.0

Major update including:

Math changes for the CPU code:

• major improvement of spreading (gridding) kernel, switching from ES to PSWF
• better kernel parameter logic that much more closely than before matches user tolerance
• on-the-fly polynomial coefficient generation allowing SIMD-vectorized Horner kernel evaluation at
• arbitrary upsampling factor

New GPU method 3 for type 1 NUFFTs (spread) with higher performance than method 2 especially at high accuracy

Other improvements / features / changes (CPU unless stated):

• new "execute_adjoint" added to the API, so that only one plan needed for type 1/2 pairs
• work array allocation moved from plan/setpts to execute stage
• major CMake/CI build improvement, including MATLAB/CUDA, LTO support
• improved tolerance-sweeping error tests as part of CI, better performance tests
• moving finufft_spread_opts.h from public to private
• finufft_opts adds spread_kerformula, deprecates kerevalmeth and kerpad
• GPU performance improvements via binsize and np heuristics
• various minor bugfixes and tidying (GPU and CPU)
• See CHANGELOG and GH Discussion posts 798 and 809 for details.