Zig 0.17.0-dev (Split by item)

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cosdf

trig.cosdf

pub fn cosdf(x: f64) f32

File

lib/compiler_rt/trig.zig:69

Code

pub fn cosdf(x: f64) f32 {
    // |cos(x) - c(x)| < 2**-34.1 (~[-5.37e-11, 5.295e-11]).
    const C0 = -0x1ffffffd0c5e81.0p-54; // -0.499999997251031003120
    const C1 = 0x155553e1053a42.0p-57; //  0.0416666233237390631894
    const C2 = -0x16c087e80f1e27.0p-62; // -0.00138867637746099294692
    const C3 = 0x199342e0ee5069.0p-68; //  0.0000243904487962774090654

    // Try to optimize for parallel evaluation as in __tandf.c.
    const z = x * x;
    const w = z * z;
    const r = C2 + z * C3;
    return @floatCast(((1.0 + z * C0) + w * C1) + (w * z) * r);
}