Re: 5.1b cc optimizer problem?
From: none (mooney_at_zorak.(none))
Date: 09/02/03
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Date: Tue, 02 Sep 2003 04:19:53 -0000
In article <%i31b.2973$Nt5.165@news.cpqcorp.net>,
Andrew Duane USG <duane@wasted.zk3.dec.com> wrote:
>I'll let someone from the compiler group jump in with more details, but
>the compiler hasn't changed a whole lot in 5.1B, and I haven't noticed
>anything like this from it, now or ever before.
>
>One of my main jobs here is to make sure the Tru64 kernel compiles correctly
>with the compiler, so I keep careful tabs on code generation, optimization,
>all sorts of issues. In the last 10 years, I have had at least a dozen cases
>where I was sure the compiler was doing something wrong.
>
>I was proven wrong every time.
>
>Optimization can uncover some source code issues that lay dormant before.
>You would be amazed at what some people think they can get away with.
>Even code that has worked for years and many releases can suddenly break
>when a "trivial" printf is added, since register allocation now changes,
>or an old return value, previously unimportant, is now critical.
I agree with all of these things and understand the point you're making.
I hesitated to even bring the issue up for the same reasons -- I think
the Tru64 compiler is high quality and the people that are part of the
developer tools group are doing a great job.
Still, I'm at a loss to explain the problems I mentioned in my original post,
and was looking to see if anyone else had noticed the same types of issues.
Since I didn't receive any positive responses, I'll assume that it's not a
compiler issue, and that the problem lies elsewhere. If I can track the
issue further, I'll be sure to post further information.
Tim
-- Tim Mooney mooney@dogbert.cc.ndsu.NoDak.edu Information Technology Services (701) 231-1076 (Voice) Room 242-J6, IACC Building (701) 231-8541 (Fax) North Dakota State University, Fargo, ND 58105-5164
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