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add_and_denorm

fma.add_and_denorm

fn add_and_denorm(a: f64, b: f64, scale: i32) f64

File

lib/compiler_rt/fma.zig:210

Code

fn add_and_denorm(a: f64, b: f64, scale: i32) f64 {
    var sum = dd_add(a, b);
    if (sum.lo != 0) {
        var uhii: u64 = @bitCast(sum.hi);
        const bits_lost = -@as(i32, @intCast((uhii >> 52) & 0x7FF)) - scale + 1;
        if ((bits_lost != 1) == (uhii & 1 != 0)) {
            const uloi: u64 = @bitCast(sum.lo);
            uhii = uhii + 1 - (((uhii ^ uloi) >> 62) & 2);
            sum.hi = @bitCast(uhii);
        }
    }
    return math.scalbn(sum.hi, scale);
}