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much slower?

To: <gcc at gcc dot gnu dot org>
Subject: much slower?
From: "Jacques Bloch" <bloch at theory dot phy dot anl dot gov>
Date: Wed, 17 Nov 1999 11:54:46 -0600

Hello,

I have just loaded the gcc 2.95.2 release on top of my cygwin B20.1 release and have recompiled my programs (on a WinNT machine). I am theoretical physics researcher and my programs are performing very heavy arithmetic. To my astonishment I discovered that my programs run about 25% SLOWER with the new compiler, using the same optimization option -O. If I then use the option -O3, the program even gets 65% slower!

Do you have any idea why the new version is so much slower?

Best regards,

Jacques Bloch

Follow-Ups:
- Re: much slower?
  - From: Martin v. Loewis

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