stevengj
commented
10 years ago Yes, the FFTW_NO_TIMELIMIT constant is for passing to the set_timelimit function (see the manual).
You probably don't want to export the flags that are undocumented. Most of those are mainly designed for us to use during FFTW development, for benchmarking the impact of different algorithm choices.
rspadim
Hi guy, we are creating a php binding of fftw3 ( https://github.com/bukka/php-fftw ), and i have some doubts about constant meaning:
define FFTW_NO_TIMELIMIT (-1.0) -> must find where use it, but probably "fftw_set_timelimit" function, that's right?
and these constants too, i don't know what it is, i think these are plan flags, but not sure what each one do:
define FFTW_CONSERVE_MEMORY (1U << 2)
/* undocumented beyond-guru flags /
define FFTW_ESTIMATE_PATIENT (1U << 7)
define FFTW_BELIEVE_PCOST (1U << 8)
define FFTW_NO_DFT_R2HC (1U << 9)
define FFTW_NO_NONTHREADED (1U << 10)
define FFTW_NO_BUFFERING (1U << 11)
define FFTW_NO_INDIRECT_OP (1U << 12)
define FFTW_ALLOW_LARGE_GENERIC (1U << 13) / NO_LARGE_GENERIC is default */
define FFTW_NO_RANK_SPLITS (1U << 14)
define FFTW_NO_VRANK_SPLITS (1U << 15)
define FFTW_NO_VRECURSE (1U << 16)
define FFTW_NO_SIMD (1U << 17)
define FFTW_NO_SLOW (1U << 18)
define FFTW_NO_FIXED_RADIX_LARGE_N (1U << 19)
define FFTW_ALLOW_PRUNING (1U << 20)