[Info-vax] What would be involved in moving RMS into kernel mode ?

[Simon Clubley]

On 2023-05-10, Arne Vajhøj <arne at vajhoej.dk> wrote:
> On 5/10/2023 9:23 AM, Johnny Billquist wrote:
>> On 2023-05-10 14:23, Simon Clubley wrote:
>>> There's no way that x86-64 VMS, at this point in its lifecycle, can
>>> meet those criteria, although hopefully that will change rapidly in
>>> the not too distant future.
>>>
>>> For one thing, x86-64 VMS is still built using non-optimised compilers.
>>>
>>> Any person with any experience elsewhere of the implications of that,
>>> should be asking how many bugs and other issues will emerge once VMS is
>>> built using optimised compilers ?
>> 
>> This is utter nonsense. Optimizing code don't suddenly create new bugs.
>> Unless there are bugs in the toolchain, non-optimized code and optimized 
>> code will produce the same results, but the amount of time and memory 
>> required might differ. Or else the bugs are already there in the 
>> unoptimized code.
>
> Correct code will produce the same result non-optimized and optimized.
>

Unless the optimiser has a bug in it. :-)

> In-correct code can produce different results.
>

Yes. _Apparently_ working code can suddenly become non-working code when
an optimiser is turned on for the first time or (as you point out in
another reply) when the optimiser is changed.

Simon.

-- 
Simon Clubley, clubley at remove_me.eisner.decus.org-Earth.UFP
Walking destinations on a map are further away than they appear.