------- Comment #41 from dberlin at gcc dot gnu dot org 2006-09-27 02:12 ------- Subject: Re: [4.0/4.1/4.2 Regression] alias bug with cast and call clobbered
On 26 Sep 2006 15:57:28 -0000, pcarlini at suse dot de <[EMAIL PROTECTED]> wrote: > > > ------- Comment #40 from pcarlini at suse dot de 2006-09-26 15:57 ------- > (In reply to comment #38) > > We have our reasons to enable strict aliasing by default. > > In my opinion, this is a central point. I think we should try to explain what > strict aliasing buys from the point of view of the optimizers. In my > experience, quite a few people do not quite understand *why* those aliasing > rules are there in the first place and why lately GCC (or any modern compiler, > for that matter, of course, that's the point) tries to be as strict as > possible: otherwise, those people would be more willing to learn the rules and > appreciate our (I should say, yours, Danny and compiler people) hard efforts > in > this area. > And I would be more than happy to discuss this (there is plenty of empirical evidence as to how much it buys us, etc), just not in a bug report :) Bring it to gcc@ -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28778
