lkml.org 
[lkml]   [2001]   [Jan]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: * 4 converted to << 2 for networking code
    On Wed, Jan 10, 2001 at 04:11:46PM +0100, Jakob ?stergaard wrote:
    > On most processors <<2 is slower than *4. It's outright stupid to
    > write <<2 when we mean *4 in order to optimize for one out of a
    > gazillion supported architectures - even more so when the compiler
    > for the one CPU where <<2 is faster, will actually generate a shift
    > instead of a multiply as a part of the standard optimization.

    Hug, ok, so all the << 2 already in should be changed in *4.
    My point is that it is better to use only << 2 or *4, selecting
    the better form.

    --
    Salvatore Sanfilippo | <antirez@invece.org>
    http://www.kyuzz.org/antirez | PGP: finger antirez@tella.alicom.com
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2005-03-22 13:28    [W:0.025 / U:2.312 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site