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| author | Charles Karney <charles.karney@sri.com> | 2020-10-26 18:29:19 -0400 |
|---|---|---|
| committer | Charles Karney <charles.karney@sri.com> | 2020-10-26 18:29:19 -0400 |
| commit | 75a8436b2491dbc1eebb196ea42b961fd011a52e (patch) | |
| tree | 4e43de3a122c7ddf163e89dcf386bc72d239619a /docs/source/development/reference/cpp/cpp_general.rst | |
| parent | ee35d15db597801a86314dc8a47da7de10c9d8f2 (diff) | |
| download | PROJ-75a8436b2491dbc1eebb196ea42b961fd011a52e.tar.gz PROJ-75a8436b2491dbc1eebb196ea42b961fd011a52e.zip | |
Use sincos optimization in merc_e_forward. Revised timing data...
Times per call in ns = nanoseconds.
Fedora 31 Ubuntu 18
g++-9.3.1 g++-7.5.0
fwd inv fwd inv
old merc 207 461 217 522
new merc 159 457 137 410
etmerc 212 196 174 147
The new forward method is now 25% faster (resp 35% faster) on Fedora
31 (resp Ubuntu 18). The new inverse method is the same speed (resp 20%
faster) on Fedora 31 (resp Ubuntu 18).
The accuracy is hardly affected: rms error increases from 0.30 nm to
0.33 nm, max error increases from 1.83 nm to 1.84 nm (a barely
noticeable degradation).
Diffstat (limited to 'docs/source/development/reference/cpp/cpp_general.rst')
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