Messages in this thread | | | Date | Fri, 16 Apr 1999 11:21:12 +0200 (CEST) | From | Ingo Molnar <> | Subject | Re: Ingo's PIII FXSTOR patch [2 Mar] causes problems |
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On 16 Apr 1999, Linus Torvalds wrote:
> I haven't looked into the exact details, but I guess you're referring to > the fact that fxsave only saves the "empty" bit. > > That's not lossy: the rest of the tag information is implicit in the > actual value of the stack entry. > > It shoul dbe really easy to convert between the new and the old format: > let the hardware do it for you: > > fxrestore new-format > fnsave old-format > > I don't see any loss of information anywhere.. Am I overlooking > something?
yep this should work. (i optimized this because the above takes about 300 cycles to do, but it's an incorrect approach) But i doubt this is the cause of the numeric instability observed, nothing i know of relies on the tag/status word exported through the ptrace interface. [but i agree that we should be rather correct than fast]
Ingo
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