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rintf

math.rintf

fn rintf(x: f32) callconv(.c) f32

File

lib/c/math.zig:376

Code

fn rintf(x: f32) callconv(.c) f32 {
    const toint: f32 = 1.0 / math.floatEps(f32);
    const a: u32 = @bitCast(x);
    const e = a >> 23 & 0xff;
    const s = a >> 31;
    var y: f32 = undefined;

    if (e >= 0x7f + 23) {
        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;
}