tech-userlevel archive

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]

Re: Default value of x87 registers' reserved bits

2010/5/31 Giles Lean <>:
> Thor Lancelot Simon <> wrote:
>> Oh, that's not _especially_ nasty.  _Especially_ nasty is having the bits
>> always read the same way but have persistent effect on write.
> "Ouch."  /me has been away from device drivers long enough to
> forget that sort of thing, and not long enough to want to go
> back.
> It's another reason for doing it how the book says and not trying
> to optimise it especially.
> Giles

Giles, Thor, thank you both for providing your insight on the possible
gotchas and raising my awareness on the ramifications of one option
versus the other.

For the moment, I will go down the route Joerg suggested and see how
it works out. In any case, the issue is well documented in my code and
it won't go unnoticed by the reviewers, if any, if ever :)

Best regards,

Home | Main Index | Thread Index | Old Index