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From: Mats Weber <matsw@mail.com>
Subject: Re: GNAT & GCC performace (bad news)
Date: 1999/12/03
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Date: 1999-12-03T09:51:14+00:00
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The level of optimization is very important if you are using gcc, and
could very well account for your 50%. With -O0 (the default) gcc
generates easy to debug but quite inefficent code (look at the gcc
docs). You really have to use at least -O1 if you want your comparison
to be meaningful.

And you have to suppress checks in Ada to compare with C.