Re: KNF and the C preprocessor

[David Young <dyoung%pobox.com@localhost>]

On Mon, Dec 10, 2012 at 03:50:00PM -0500, Thor Lancelot Simon wrote:
> On Mon, Dec 10, 2012 at 02:28:28PM -0600, David Young wrote:
> > On Mon, Dec 10, 2012 at 07:37:14PM +0000, David Laight wrote:
> > 
> > > a) #define macros tend to get optimised better.
> > 
> > Better even than an __attribute__((always_inline)) function?
> 
> I'd like to submit that neither are a good thing, because human
> beings are demonstrably quite bad at deciding when things should
> be inlined, particularly in terms of the cache effects of excessive
> inline use.

I agree with that.  However, occasionally I have found when I'm
optimizing the code based on actual evidence rather than hunches, and
the compiler is letting me down, always_inline was necessary.

Dave

-- 
David Young
dyoung%pobox.com@localhost    Urbana, IL    (217) 721-9981