computePow5

    fn computePow5(i: u32) [2]u64 {
        const base = i / FLOAT64_POW5_TABLE_SIZE;
        const base2 = base * FLOAT64_POW5_TABLE_SIZE;
        const mul = &FLOAT64_POW5_SPLIT2[base];
        if (i == base2) {
            return .{ mul[0], mul[1] };
        } else {
            const offset = i - base2;
            const m = FLOAT64_POW5_TABLE[offset];
            const b0 = @as(u128, m) * mul[0];
            const b2 = @as(u128, m) * mul[1];
            const delta: u7 = @intCast(pow5Bits(i) - pow5Bits(base2));
            const shift: u5 = @intCast((i % 16) << 1);
            const shifted_sum = ((b0 >> delta) + (b2 << (64 - delta))) + 1 + ((FLOAT64_POW5_OFFSETS[i / 16] >> shift) & 3);
            return .{ @truncate(shifted_sum), @truncate(shifted_sum >> 64) };
        }
    }