-ffloat-store behavior (Re: Susprising behavior of gcc on x86 (-m32))

[Andrew Haley]

Hi,

On 09/09/2015 08:18 AM, Mathieu Malaterre wrote:
> 1. removed -ffast-math
> 2. add -std=c99
> 3. Change the code for an explicit storage of division (div = dd / dr)
> => issue solved !

Not really, no.  Al you've done is conceal the bug.

I really think you should fix the bug.  Otherwise it will keep coming
back.  -ffloat-store and -fexcess-precision=standard are just
workarounds.

My problem, of course, is that I don't really know what this code is
trying to do, and why it is so sensitive to the last significant bits
of floating-point precision.

Andrew.