Zig 0.17.0-dev (Split by item)

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rint

math.rint

fn rint(x: f64) callconv(.c) f64

File

lib/c/math.zig:355

Code

fn rint(x: f64) callconv(.c) f64 {
    const toint: f64 = 1.0 / math.floatEps(f64);
    const a: u64 = @bitCast(x);
    const e = a >> 52 & 0x7ff;
    const s = a >> 63;
    var y: f64 = undefined;

    if (e >= 0x3ff + 52) {
        return x;
    }
    if (s == 1) {
        y = x - toint + toint;
    } else {
        y = x + toint - toint;
    }
    if (y == 0) {
        return if (s == 1) -0.0 else 0;
    }
    return y;
}