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sindf

trig.sindf

pub fn sindf(x: f64) f32

File

lib/compiler_rt/trig.zig:169

Code

pub fn sindf(x: f64) f32 {
    // |sin(x)/x - s(x)| < 2**-37.5 (~[-4.89e-12, 4.824e-12]).
    const S1 = -0x15555554cbac77.0p-55; // -0.166666666416265235595
    const S2 = 0x111110896efbb2.0p-59; //  0.0083333293858894631756
    const S3 = -0x1a00f9e2cae774.0p-65; // -0.000198393348360966317347
    const S4 = 0x16cd878c3b46a7.0p-71; //  0.0000027183114939898219064

    // Try to optimize for parallel evaluation as in __tandf.c.
    const z = x * x;
    const w = z * z;
    const r = S3 + z * S4;
    const s = z * x;
    return @floatCast((x + s * (S1 + z * S2)) + s * w * r);
}