From: Dan Sugalski <dan@...>
Date: 2003-01-07T01:11:03+09:00
Subject: Re: Compile time constant folding?

At 4:14 PM +0900 1/6/03, Dalibor Sramek wrote:
>On Mon, Jan 06, 2003 at 11:15:46AM +0900, Dan Sugalski wrote:
>>  You'd be surprised, especially when you factor in some other
>>  optimizations--you can do some substitutions and inferences of
>>  variable contents.
>
>Could the programmer help the compiler with guessing when the
>optimization is feasible?

Generally not--it seems to hurt more than it helps in places where 
you can do it. Most people get that sort of thing wrong, and when 
they do get it right those sorts of hints get stale quickly. It's 
better to just clearly express the semantics and let the compilers 
take care of figuring out where things can be feasably optimized.
-- 
                                         Dan

--------------------------------------"it's like this"-------------------
Dan Sugalski                          even samurai
dan@sidhe.org                         have teddy bears and even
                                       teddy bears get drunk