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sinh64

sinh.sinh64

fn sinh64(x: f64) f64

File

lib/std/math/sinh.zig:62

Code

fn sinh64(x: f64) f64 {
    const u = @as(u64, @bitCast(x));
    const w = @as(u32, @intCast(u >> 32)) & (maxInt(u32) >> 1);
    const ax = @as(f64, @bitCast(u & (maxInt(u64) >> 1)));

    if (x == 0.0 or math.isNan(x)) {
        return x;
    }

    var h: f32 = 0.5;
    if (u >> 63 != 0) {
        h = -h;
    }

    // |x| < log(FLT_MAX)
    if (w < 0x40862E42) {
        const t = math.expm1(ax);
        if (w < 0x3FF00000) {
            if (w < 0x3FF00000 - (26 << 20)) {
                return x;
            } else {
                return h * (2 * t - t * t / (t + 1));
            }
        }
        // NOTE: |x| > log(0x1p26) + eps could be h * exp(x)
        return h * (t + t / (t + 1));
    }

    // |x| > log(DBL_MAX) or nan
    return 2 * h * expo2(ax);
}