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Re: [PPL-devel] More floating point problems on the Alpha
On Mon, Sep 22, 2008 at 09:41:05PM +0000, Joseph S. Myers wrote:
> On Mon, 22 Sep 2008, Joe Buck wrote:
>
> > On Mon, Sep 22, 2008 at 09:56:30PM +0200, Abramo Bagnara wrote:
> > > The problem come from the fact that for astonishing reasons 1.4e-45f is
> > > not seen as 1.4e-45.
> >
> > Why is this astonishing? The smallest positive single-precision IEEE
> > floating point number is roughly 1.175494e-38. Since user-specified
> > numbers are rounded to the closest representable value, 1.4e-45f is
> > a fancy way of typing zero.
>
> The smallest subnormal value is approximately 1.40129846e-45F
> (__FLT_DENORM_MIN__). The obvious conclusion is that subnormal support is
> broken or disabled on Alpha by default.
OK. I apologize for the noise.