Re: [patch/rfc 2/4] pcf875x I2C GPIO expander driver

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Jean Delvare wrote:
!!(value & (1 << offset))
is more efficiently written
(value >> offset) & 1

... but not more efficiently implemented.

Your version requires code to do the shift on live data at runtime. David's version lets the compiler create the mask once, at compile-time.



b.g.

--
Bill Gatliff
[email protected]

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux