Zig 0.17.0-dev (Split by item)

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cosh32

cosh.cosh32

fn cosh32(x: f32) f32

File

lib/std/math/cosh.zig:31

Code

fn cosh32(x: f32) f32 {
    const u = @as(u32, @bitCast(x));
    const ux = u & 0x7FFFFFFF;
    const ax = @as(f32, @bitCast(ux));

    // |x| < log(2)
    if (ux < 0x3F317217) {
        if (ux < 0x3F800000 - (12 << 23)) {
            math.raiseOverflow();
            return 1.0;
        }
        const t = math.expm1(ax);
        return 1 + t * t / (2 * (1 + t));
    }

    // |x| < log(FLT_MAX)
    if (ux < 0x42B17217) {
        const t = @exp(ax);
        return 0.5 * (t + 1 / t);
    }

    // |x| > log(FLT_MAX) or nan
    return expo2(ax);
}