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From: "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com>
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Subject: Re: Keeping other stuff with addresses
Date: Tue, 3 Dec 2024 17:03:15 -0800
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On 12/3/2024 11:22 AM, MitchAlsup1 wrote:
> On Tue, 3 Dec 2024 18:19:51 +0000, John Levine wrote:
> 
>> According to Stefan Monnier  <monnier@iro.umontreal.ca>:
>>>> another way to steal bits is over alignment.
>>>
>>> Yup.  I keep lamenting that Alpha didn't go for bit-addressed memory,
>>> which would have given us 3 extra free bits from alignment (as well as
>>> allowing pointers to bits and bitfields).
>>
>> I thought STRETCH persuaded people that bit addressable memory was a bad
>> idea.
> 
> With the address space STRETCH had bit addressability IS a VERY bad
> Idea.
> 
> We now have people (again) using the top bits of pointers for "special
> things".
> 
> Thus the Ferris wheel of invention is caught in a loop.

Stealing bit's wrt say, lock-free algorithms is usually about stealing 
from a pointer "value". think about C++'s std::uintptr_t, for a 
moment... Iirc, it may be optional, well, stealing bits from a pointer 
_value_ is non portable in and of itself. Although, they can be very 
useful, indeed... :^)