Re: [Qemu-devel] [RFC] alpha qemu arithmetic exceptions

[Al Viro <viro@ZenIV.linux.org.uk>]

On Tue, Jul 08, 2014 at 11:12:20AM -0700, Richard Henderson wrote:
> On 07/08/2014 09:13 AM, Al Viro wrote:
> > Frankly, I suspect that it's better to have qemu-system-alpha behave like
> > the actual hardware does (including "FPCR.DNOD can't be set") and keep the
> > linux-user behaviour as is, for somebody brave and masochistic enough to
> > fight that one.  And no, it's nowhere near "just let denorms ride through
> > the normal softfloat code and play a bit with the flags it might raise".
> > And then there's netbsd/alpha and openbsd/alpha, so in theory somebody might
> > want to play with their software completion semantics (not identical to Linux
> > one) for the sake of yet-to-be-written bsd-user alpha support...
> 
> You're probably right there.
> 
> I've pushed a couple more patches to the branch, split out from your patch
> here.  I believe I've got it all, and havn't mucked things up in the process.
> I'll run some tests later today when I've got time.

Just one thing - 0x1fffffffffffff will make 32bit hosts whine about integer
constant being too large.  So will 0x1ffffffffffffful, unfortunately - it
really ought to be ull.