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From: Terje Mathisen <terje.mathisen@tmsw.no>
Newsgroups: comp.arch
Subject: Re: Computer architects leaving Intel...
Date: Tue, 17 Sep 2024 08:07:44 +0200
Organization: A noiseless patient Spider
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David Brown wrote:
> On 16/09/2024 10:37, Terje Mathisen wrote:
>> This becomes much simpler in Rust where usize is the only legal index =

>> type:
>>
>> Yeah, you have to actually write it as
>>
>> =C2=A0=C3=82=C2=A0 y =3D p[x];
>> =C2=A0=C3=82=C2=A0 x +=3D 1;
>>
>> instead of a single line, but this makes zero difference to the=20
>> compiler, right?
>>
>=20
> I don't care much about the compiler - but I don't think this is an=20
> improvement for the programmer.=C2=A0 (In general, I dislike trying to =
do too=20
> much in a single expression or statement, but some C constructs are=20
> common enough that I am happy with them.=C2=A0 It would be hard to form=
ulate=20
> concrete rules here.)
>=20
> And the resulting object code is less efficient than you get with signe=
d=20
> int and "y =3D p[x++];" (or "y =3D p[x]; x++;") in C.

Is that true? I'll have to check godbolt myself if that is really the cas=
e!

Terje


--=20
- <Terje.Mathisen at tmsw.no>
"almost all programming can be viewed as an exercise in caching"