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Re: gcc 4.3.x: Bug in ieee754-{df,sf}.S
- From: James Dennett <james dot dennett at gmail dot com>
- To: Sven Köhler <sven dot koehler at gmail dot com>
- Cc: gcc at gcc dot gnu dot org
- Date: Mon, 14 May 2012 14:01:15 -0700
- Subject: Re: gcc 4.3.x: Bug in ieee754-{df,sf}.S
- References: <jorq6n$s0v$1@dough.gmane.org>
On Mon, May 14, 2012 at 1:36 PM, Sven Köhler <sven.koehler@gmail.com> wrote:
> Hi,
>
> currently, our software (www.lejos.org, build with a gcc 4.3.x based
> arm-elf toolchain) manages to compare floats correctly most of the time.
> But sometimes, the comparisons don't have the expected result.
> Basically, comparisons behave non-deterministically.
>
> We believe, that this is the result of a Bug in ieee754-{df,sf}.S.
> A fix that seems to be related has been committed on June 5th, 2009, SVN
> revision 148210. The commit comment was:
>
> gcc/
> * config/arm/ieee754-df.S (cmpdf2): Avoid writing below SP.
> * config/arm/ieee754-sf.S (cmpsf2): Likewise.
>
>
> Is gcc 4.3 still supported? Will there be release of gcc 4.3.7?
No. http://gcc.gnu.org/ describes GCC 4.5.x as the "oldest maintained
release series".
> I didn't check the other branches (4.4, 4.5, or 4.6), but if it's
> missing there then it should definitely be backported to these branches
> as well.
4.4 won't get it, so far as I can see. I don't know how decisions are
made on which patches are backported to supported versions.
-- James