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redupif32

atan.redupif32

fn redupif32(x: f32) f32

File

lib/std/math/complex/atan.zig:23

Code

fn redupif32(x: f32) f32 {
    const DP1 = 3.140625;
    const DP2 = 9.67502593994140625e-4;
    const DP3 = 1.509957990978376432e-7;

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

    const u: f32 = @trunc(t);
    return ((x - u * DP1) - u * DP2) - u * DP3;
}