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From: dewar@gnat.com (Robert Dewar)
Newsgroups: comp.lang.ada
Subject: Re: Ada Compilers
Date: 21 May 2002 18:47:10 -0700
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gab@rational.com (Greg Bek) wrote in message news:<afb6d339.0205211331.30124c52@posting.google.com>...

> sum of products will never overflow.  It then discovers that
> the resulting matrix is never used, so it throws out the entire 
> matrix multiplication.  The surrounding timing loop is now 
> timing a null operation.

Right, in one case where GNAT was being compared with another
compiler on this test, both versions were testing the time for
this null loop, and because of an oddity, GNAT took longer. 
So we fixed it and then it took shorter. Wonderful, but nothing
at all to do with the intent of the test. The PIWG tests are
very poorly written from this point of view.