Re: * 4 converted to << 2 for networking code
antirez (antirez@invece.org)
Wed, 10 Jan 2001 18:25:46 +0100
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
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