computePow5

    fn computePow5(i: u32) [4]u64 {
        const base = i / FLOAT128_POW5_TABLE_SIZE;
        const base2 = base * FLOAT128_POW5_TABLE_SIZE;
        const mul = &FLOAT128_POW5_SPLIT[base];
        if (i == base2) {
            return mul.*;
        } else {
            const offset = i - base2;
            const m = &FLOAT128_POW5_TABLE[offset];
            const delta = pow5Bits(i) - pow5Bits(base2);

            const shift: u6 = @intCast(2 * (i % 32));
            const corr: u32 = @intCast((FLOAT128_POW5_ERRORS[i / 32] >> shift) & 3);
            return mul_128_256_shift(m, mul, delta, corr);
        }
    }