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Re: New Vax - future directions :-)
> On Jul 6, 2021, at 10:42 AM, Mouse <mouse%Rodents-Montreal.ORG@localhost> wrote:
>> So I'd say [EMUL/EMULU] definitely have value. However, it's a fair
>> point that it might be hard to get compilers to make use of it.
> Perhaps. But it can be used under the hood by large-number support
> routines, either libc "word×word->doubleword" or large integer
> arithmetic such as is used by modern crypto. Even if there are only
> two EMULU instructions in an executable, they can still make a
> significant difference.
>> As is the case for so much of the stuff in the VAX. It's good for
>> people writing in assembler, but difficult to make use of by
> Well, modern compilers, because they attempt to be multi-target. Build
> a VAX-target compiler, with no care for non-VAX targets, and it becomes
GCC certainly can handle single * single -> double operations, that's a standard pattern in the back end support machinery. PDP11 and VAX both use it, as do 28 other targets GCC knows about.
>>> You don't have any modern language that want to deal with the upper
>>> part anyway.
> Only antique languages (like Lisp) with bignum support, or fringe
> applications like cryptography.
I don't think Python 3 is an antique language, and it uses bignum arithmetic for all its integer arithmetic. Python 2 do so optionally. And cryptography is about as far from a fringe application as you can get.
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