Re: [PATCH] Re: Bignum performance

[Emanuel Berg]

Po Lu wrote:

>>> Under Arm64, general purpose integer registers are 64 bits
>>> wide. That is also the word size of said machine.
>>
>> If they are, the range for fixnums is
>>
>> (list (* -1 (expt 2 (1- 64)))
>>       (1-   (expt 2 (1- 64))) )
>>
>> (-9223372036854775808 9223372036854775807)
>>
>> Only after that it gets slower :P
>
> Lisp systems normally set aside several of the high or low
> bits of a register as a tag linking a type to the
> object represented.

But here we are at the CPU architecture level (register
length), surely Lisp don't meddle with that?

No, I sense that it is, actually. So please explain, then, how
it works. And in particular, how many bits do we (Elisp and
CL) actually have for our fixnums?

Or, ar we talking bignums now?

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