Zig 0.17.0-dev (Split by item)

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dd_mul

fma.dd_mul

fn dd_mul(a: f64, b: f64) dd

File

lib/compiler_rt/fma.zig:174

Code

fn dd_mul(a: f64, b: f64) dd {
    var ret: dd = undefined;
    const split: f64 = 0x1.0p27 + 1.0;

    var p = a * split;
    var ha = a - p;
    ha += p;
    const la = a - ha;

    p = b * split;
    var hb = b - p;
    hb += p;
    const lb = b - hb;

    p = ha * hb;
    const q = ha * lb + la * hb;

    ret.hi = p + q;
    ret.lo = p - ret.hi + q + la * lb;
    return ret;
}