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From: "ibuclaw at gdcproject dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug d/95174] [D] Incorrect compiled functions involving const fixed
 size arrays
Date: Mon, 18 May 2020 14:12:22 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95174

Iain Buclaw <ibuclaw at gdcproject dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |INVALID
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #1 from Iain Buclaw <ibuclaw at gdcproject dot org> ---
(In reply to Witold Baryluk from comment #0)
> https://explore.dgnu.org/z/LppySp
>=20
>=20
[--snip--]
>=20
> Is incorrectly compiled to 'nop; ret'
>=20

It is correct, all those functions do nothing.  What you're missing is a 'r=
ef'
or 'out' storage class on the 'o' parameter.

Rationale, static arrays are value types in D (they don't saturate to point=
ers
like in C).

See https://dlang.org/spec/arrays.html#static-arrays

>=20
> As a bonus:
>=20
> ```
> void fffff(immutable(float[4]) x, float[4] o) {
>    o[2] =3D x[1] + x[3];
> }
>=20
> import std.stdio : writeln;
>=20
> void main() {
>   immutable(float[4]) k =3D [7.0f, 5.3f, 1.2f, 3.2f];
>   float[4] o;
>   fffff(k, o);
>   writeln(o);
> }
>=20
> ```
>=20
> prints '[nan, nan, nan, nan]', but it should: '[nan, nan, 8.5, nan]'.
>=20
>=20

All NaNs is the correct result here too.=