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2 Commits

Author SHA1 Message Date
Lynne
ace42cf581 x86/tx_float: add 15xN PFA FFT AVX SIMD 
~4x faster than the C version.
The shuffles in the 15pt dim1 are seriously expensive. Not happy with it,
but I'm contempt.

Can be easily converted to pure AVX by removing all vpermpd/vpermps
instructions.
 2022-09-23 12:35:27 +02:00
Lynne
68dfb87035 doc/transforms: add documentation for the FFT transforms 
Makes the code far easier to follow, and makes creating new SIMD
for the transforms far, far easier.
 2021-04-24 17:19:17 +02:00