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Re: paranoia on PowerPC

From: Segher Boessenkool <segher at kernel dot crashing dot org>
To: Joel Sherrill <joel dot sherrill at oarcorp dot com>
Cc: Andrew Pinski <pinskia at gmail dot com>, Eric Norum <norume at aps dot anl dot gov>, GCC List <gcc at gcc dot gnu dot org>
Date: Tue, 31 Jul 2007 19:38:50 +0200
Subject: Re: paranoia on PowerPC
References: <46A53192.3000602@oarcorp.com> <de8d50360707231619y758c8d4et6a1feaed6043f082@mail.gmail.com> <46A53B03.3090401@oarcorp.com>

Given the age of paranoia (the version included
with RTEMS is from Cygnus circa 1993), does this
sound familiar or is this a new issue?

What happens if you use -mno-fused-madd option?


Same result for me using RTEMS on psim.  Eric N. will
have to give a Mac report.


I tested it (the source from netlib.org, that is) with GCC-2.95,
3.3, and various 4.x on Darwin and Linux, both 32-bit and
64-bit; all versions failed with optimisation without
-mno-fused-madd, and all versions passed with any optimisation
with -mno-fused-madd.  So I would say the only bug is in
paranoia itself (namely, it flags fused multiply-add as a
flaw).

If the RTEMS version of paranoia shows different results, it
probably is time to update it?

Segher

References:
- paranoia on PowerPC
  - From: Joel Sherrill
- Re: paranoia on PowerPC
  - From: Andrew Pinski
- Re: paranoia on PowerPC
  - From: Joel Sherrill

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