Zig 0.17.0-dev (Split by item)

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acosh32

acosh.acosh32

fn acosh32(x: f32) f32

File

lib/std/math/acosh.zig:26

Code

fn acosh32(x: f32) f32 {
    const u = @as(u32, @bitCast(x));
    const i = u & 0x7FFFFFFF;

    // |x| < 2, invalid if x < 1 or nan
    if (i < 0x3F800000 + (1 << 23)) {
        return math.log1p(x - 1 + @sqrt((x - 1) * (x - 1) + 2 * (x - 1)));
    }
    // |x| < 0x1p12
    else if (i < 0x3F800000 + (12 << 23)) {
        return @log(2 * x - 1 / (x + @sqrt(x * x - 1)));
    }
    // |x| >= 0x1p12
    else {
        return @log(x) + 0.693147180559945309417232121458176568;
    }
}