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

[Richard Henderson]

On 07/08/2014 12:02 PM, Al Viro wrote:
> 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.
> 

I did use ull on the branch.


r~