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Re: Should gcc-4.0 apply mathematical associative rules for addition or multiplication

From: Mike Stump <mrs at apple dot com>
To: Fariborz Jahanian <fjahanian at apple dot com>
Cc: Gabriel Dos Reis <gdr at cs dot tamu dot edu>, gcc at gcc dot gnu dot org
Date: Mon, 4 Oct 2004 16:56:20 -0700
Subject: Re: Should gcc-4.0 apply mathematical associative rules for addition or multiplication
References: <A8FEC34A-1658-11D9-957B-000A95BA54A6@apple.com> <m3zn326q4v.fsf@merlin.cs.tamu.edu> <9B544E16-1660-11D9-957B-000A95BA54A6@apple.com>

On Oct 4, 2004, at 4:53 PM, Fariborz Jahanian wrote:

On Oct 4, 2004, at 4:05 PM, Gabriel Dos Reis wrote:
Multiplication on floating point datatypes is *NOT* associative.
Transformations that are predicated on associativity are not
optimizations in that case.? They may be applied only if
-funsafe-transformations.
I don't see this flag defined in gcc-4.0. Are you proposing such a flag?

man gcc

then look for unsafe...

-funsafe-math-optimizations

References:
- Should gcc-4.0 apply mathematical associative rules for addition or multiplication
  - From: Fariborz Jahanian
- Re: Should gcc-4.0 apply mathematical associative rules for addition or multiplication
  - From: Gabriel Dos Reis
- Re: Should gcc-4.0 apply mathematical associative rules for addition or multiplication
  - From: Fariborz Jahanian

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