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| author |  Guoqiang QI <425418567@qq.com> | 2021-02-24 21:36:47 +0000 |
|---|---|---|
| committer |  Rasmus Munk Larsen <rmlarsen@google.com> | 2021-02-24 21:36:47 +0000 |
| commit | f44197fabdfeb6008fba543e0a12959dc20735ae (patch) | |
| tree | 0520a92d63af484b8fef04395ef50b8c0679a230 /Eigen/src/Core/arch | |
| parent | a31effc3bca2f0924752caeebfd6f61f7edf9a43 (diff) | |
Some improvements for kissfft from Martin Reinecke(pocketfft author):
1.Only computing about half of the factors and use complex conjugate symmetry for the rest instead of all to save time.
2.All twiddles are calculated in double because that gives the maximum achievable precision when doing float transforms.
3.Reducing all angles to the range 0<angle<pi/4 which gives even more precision.
Diffstat (limited to 'Eigen/src/Core/arch')
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