llvm dev - Jan 2010 - [LLVMdev] Help adding the Bullet physics sdk benchmark to the LLVM test suite?

On Jan 5, 2010, at 1:38 PM, David Greene wrote:
> I don't think there's a flag that says "don't do anything
risky,
> ever."
"Don't do anything risky with floating-point" is the default mode.
If you're
aware of any unsafe floating-point optimizations being done by default, please
file a bug.
> For example, a gfortran-fronted LLVM should have a way to always respect
> ordering indicated by parentheses.  I don't know if gfortran even has
that,
> let alone LLVM proper.
LLVM does not currently re-associate floating-point values, so this hasn't
been an issue.

Dan

On Tuesday 05 January 2010 15:57, Dan Gohman wrote:
> On Jan 5, 2010, at 1:38 PM, David Greene wrote:
> > I don't think there's a flag that says "don't do
anything risky,
> > ever."
>
> "Don't do anything risky with floating-point" is the default
mode. If
> you're aware of any unsafe floating-point optimizations being done by
> default, please file a bug.
Ok.  It seems that something is causing a problem if Bullet is failing.

                               -Dave

We haven't determined what 'failing' means or what the
'correct' behaviour
is.

Imagine a ball at the top of a rounded hill. If the ball is not exactly at
the top but a tiny amount on the left it will roll left,
but a tiny amount on the right it will roll right. The difference in initial
position can be negligible but the final result is miles away.

Is there a irc channel or perhaps google wave for a quick chat? Or do people
prefer to keep all communication in the mailing list so everyone can
participate?
Thanks,
Erwin



2010/1/5 David Greene <dag at cray.com>
> On Tuesday 05 January 2010 15:57, Dan Gohman wrote:
> > On Jan 5, 2010, at 1:38 PM, David Greene wrote:
> > > I don't think there's a flag that says "don't do
anything risky,
> > > ever."
> >
> > "Don't do anything risky with floating-point" is the
default mode. If
> > you're aware of any unsafe floating-point optimizations being done
by
> > default, please file a bug.
>
> Ok.  It seems that something is causing a problem if Bullet is failing.
>
>                               -Dave
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> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
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