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Re: What is acceptable for -ffast-math? (Was: associative law in combine)
- To: Neil Booth <neil at daikokuya dot demon dot co dot uk>
- Subject: Re: What is acceptable for -ffast-math? (Was: associative law in combine)
- From: Alexandre Oliva <aoliva at redhat dot com>
- Date: 30 Jul 2001 20:27:03 -0300
- Cc: Linus Torvalds <torvalds at transmeta dot com>, dewar at gnat dot com, moshier at moshier dot ne dot mediaone dot net, gcc at gcc dot gnu dot org, tprince at computer dot org
- Organization: GCC Team, Red Hat
- References: <20010731001116.A11789@daikokuya.demon.co.uk>
On Jul 30, 2001, Neil Booth <neil@daikokuya.demon.co.uk> wrote:
> Alexandre Oliva wrote:-
>> I am serious. The preprocessor should protect individual parentheses
>> from becoming consecutive by introducing whitespace.
> And what about existing user code?
Well, depending on whether we enable this feature by default or not,
we might get different code generated or not. If we don't apply
unsafe transformations by default, existing user code certainly won't
be affected. If we do, we may lose optimization opportunities that
were not intended to be avoided by users unaware of this feature.
--
Alexandre Oliva Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer aoliva@{cygnus.com, redhat.com}
CS PhD student at IC-Unicamp oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist *Please* write to mailing lists, not to me