From: Nala Ginrut <nalaginrut@gmail.com>
To: Maxime Devos <maximedevos@telenet.be>
Cc: Guile User <guile-user@gnu.org>
Subject: Re: Screaming-Fist: a JIT framework for Guile
Date: Wed, 6 Dec 2023 04:30:51 +0800 [thread overview]
Message-ID: <CAPjoZofhDTFkV0bdGbkiFen2L7gLy-4DDJn2OhG4Ouy7U=-Bww@mail.gmail.com> (raw)
In-Reply-To: <CAPjoZofM-eGCVqV0wA2g0xYY6yU4HGj7F8hSGWtCVxz49EWuBw@mail.gmail.com>
Hi folks, I confirmed that gcc_jit_context_new_rvalue_from_int is an
abstract for various numbers.
So the number's validation would be added then.
Best regards.
On Tue, Dec 5, 2023, 18:14 Nala Ginrut <nalaginrut@gmail.com> wrote:
> Hi Maxime!
>
>
>
> On Tue, Dec 5, 2023, 05:26 Maxime Devos <maximedevos@telenet.be> wrote:
>
>>
>>
>> Op 03-12-2023 om 18:26 schreef Nala Ginrut:
>> > (jit-define (square x)
>> > (:anno: (int) -> int)
>> > (* x x))
>> > (square 5)
>>
>>
>> Potentially-overflowing arithmetic involving ints (not unsigned ints,
>> but ints)? Best document somewhere to what the jit code '(* x x)'
>> evaluates when (not (<= min-int (* x x) max-int))).
>>
>
> There's no type inference in libgccjit, so the high level framework has to
> handle accurate types.
>
> I use "int" here because libgccjit only provides int rvalue constructor,
> yet. It seems lack of rich number types as rvalue in the present
> implementation. Even boolean has to be handled by high level framework and
> cast it to int respectively.
>
> May be we need GCC folks help.
>
>
>> Personally, I'm in favor of explicit long names like
>>
>> */error-on-overflow (<-- maybe on the C-level the function could
>> return a tagged union representing (failure [no value]) / (success [some
>> value], at a slight performance cost)
>> */wrap-around
>> */undefined-on-overflow (<-- like in C, for maximal performance and
>> dragons).
>>
>
> There was such check, but I've removed it. Since even you detect the
> int/short/long exactly, libgccjit only provides int rvalue for all cases of
> numbers. I'm not sure if it's waiting for contribution or intended as an
> unified int abstract.
>
>
>> (Likewise for +, - and unsigned int)
>>
>> Sure, they are a bit verbose, but they are explicit and
>> non-explicitness+undefined behaviour of'*' in C has caused serious
>> issues in the past, so I'd think it's better that the programmer has to
>> choose what, in their situation, are the appropriate semantics.
>>
>
> I see your point :-)
> Yes, it's a bit hard to provide an abstract arithmetic with type inference
> for all cases, providing each for different types will be easier and
> flexible.
>
> Thanks!
> Best regards.
>
>
>>
prev parent reply other threads:[~2023-12-05 20:30 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-03 17:26 Screaming-Fist: a JIT framework for Guile Nala Ginrut
2023-12-03 20:49 ` Dr. Arne Babenhauserheide
2023-12-05 9:36 ` Nala Ginrut
2023-12-04 21:26 ` Maxime Devos
2023-12-05 10:14 ` Nala Ginrut
2023-12-05 20:30 ` Nala Ginrut [this message]
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