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redupif64

atan.redupif64

fn redupif64(x: f64) f64

File

lib/std/math/complex/atan.zig:57

Code

fn redupif64(x: f64) f64 {
    const DP1 = 3.14159265160560607910;
    const DP2 = 1.98418714791870343106e-9;
    const DP3 = 1.14423774522196636802e-17;

    var t = x / math.pi;
    if (t >= 0.0) {
        t += 0.5;
    } else {
        t -= 0.5;
    }

    const u: f64 = @trunc(t);
    return ((x - u * DP1) - u * DP2) - u * DP3;
}