From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeffrey A Law <law@cygnus.com>
To: Martin Kahlert <martin.kahlert@mchp.siemens.de>
Cc: egcs@cygnus.com, axp-list@redhat.com
Subject: Re: Performance measurements 
Date: Thu, 25 Jun 1998 03:09:00 -0000
Message-id: <27446.898762594@hurl.cygnus.com>
References: <199806240851.KAA06049@keksy.mchp.siemens.de>
X-SW-Source: 1998-06/msg00894.html

  In message < 199806240851.KAA06049@keksy.mchp.siemens.de >you write:
  > Hi,
  > i tried to compare different compilers on my numerical code.
  > Therefore i extracted a FPU intensive function and surrounded
  > it with a loop while measuring the execution time.
  > 
  > I will provide the source and the Makefile at the end of this mail.
  > 
  > I work on a Linux 2.0.34 SMP Kernel (libc5). My hardware is a
  > dual Pentium Pro 200MHz system with 128MB RAM.
  > 
  > pgcc is the portland group compiler and 
  > tcc the free Tendra compiler system
  > (from http://alph.dera.gov.uk/TenDRA/ )
  > 
  > Here are my results:
  > %> make
  > pgcc:
  > 90.11 MFLOPS
  > gcc-2.7.2.1:
  > 95.46 MFLOPS
  > gcc-without double align:
  > 23.52 MFLOPS
  > egcs-2.91.42:
  > 69.96 MFLOPS
  > tcc:
  > 92.33 MFLOPS

Here's some more info.  PPro200

egcs-1.0.3	 69.96
today's sources	 70.40

Note I get 73.14 if I remove all the various -malign switches.

Not particularly good.    Can someone look into this?  It might
be another case of double alignment losing badly.  I don't know
x86 issues well enough.

Jeff