[PATCH] Implement ARM EHABI exception handling.

[Logan Chien]

Hi Joerg,

Thanks.  After considering several alternatives, it seems that your
suggestion to use __LDBL_MANT_DIGS__ is the one with least portability
issue.  I will update the patch in next revision.

Do you have further comments?  Thanks.

Logan


On Thu, May 8, 2014 at 2:47 AM, Joerg Sonnenberger
<joerg at britannica.bec.de>wrote:

> On Wed, May 07, 2014 at 11:52:57PM +0800, Logan Chien wrote:
> > The long double to be parsed are the bit pattern of long double in
> > hexadecimal.
> > For example, 4001a000000000000000 in the mangled name stands for 0xap-1L
> > (i.e. 5.0)
>
> That should depend on three factors at most, digits in the mantissa,
> digits in the exponent and exponent bias. That said, I am not aware of
> any platforms with 64bit mantissa and a representation different from
> Intel 80bit intermediates. That's why I initially suggested the simpler
> condition.
>
> > Although using __SIZEOF_LONG_DOUBLE__ is not a perfect solution, since
> the
> > additional padding might result in the overestimation of the number of
> > bits.  But it
> > is sufficient to distinguish the targets as far as I know.  Both 12 and
> 16
> > are fine for
> > the test case.
>
> IEEE quad precision should have quite a different bit layout? E.g.
> SPARC64?
>
> Joerg
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