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math: fast aprox cos and sin

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Leah Lundqvist 2020-01-29 05:12:43 +01:00 committed by GitHub
parent 5c598a3085
commit ed55778d2a
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1 changed files with 25 additions and 0 deletions
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vlib/math/math.v
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@ -320,3 +320,28 @@ pub fn trunc(a f64) f64 {
return C.trunc(a)
}
// Faster approximate sin() and cos() implemented from lolremez
pub fn aprox_sin(a f64) f64 {
a0 := 1.91059300966915117e-31
a1 := 1.00086760103908896
a2 := -1.21276126894734565e-2
a3 := -1.38078780785773762e-1
a4 := -2.67353392911981221e-2
a5 := 2.08026600266304389e-2
a6 := -3.03996055049204407e-3
a7 := 1.38235642404333740e-4
return a0 + a * (a1 + a * (a2 + a * (a3 + a * (a4 + a * (a5 + a * (a6 + a * a7))))))
}
pub fn aprox_cos(a f64) f64 {
a0 := 9.9995999154986614e-1
a1 := 1.2548995793001028e-3
a2 := -5.0648546280678015e-1
a3 := 1.2942246466519995e-2
a4 := 2.8668384702547972e-2
a5 := 7.3726485210586547e-3
a6 := -3.8510875386947414e-3
a7 := 4.7196604604366623e-4
a8 := -1.8776444013090451e-5
return a0 + a * (a1 + a * (a2 + a * (a3 + a * (a4 + a * (a5 + a * (a6 + a * (a7 + a * a8)))))))
}