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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/115304] gcc.dg/vect/slp-gap-1.c FAILs
Date: Thu, 20 Jun 2024 06:45:27 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D115304

--- Comment #13 from rguenther at suse dot de <rguenther at suse dot de> ---
On Thu, 20 Jun 2024, pinskia at gcc dot gnu.org wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D115304
>=20
> Andrew Pinski <pinskia at gcc dot gnu.org> changed:
>=20
>            What    |Removed                     |Added
> -------------------------------------------------------------------------=
---
>                  CC|                            |pinskia at gcc dot gnu.o=
rg
>=20
> --- Comment #12 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
> Note when I am adding V4QI support to the aarch64 backend (emulating it v=
ia
> V8QI), I am getting a failure in slp-gap-1.c but it is different from the
> others.
>=20
> Without V4QI, the pattern matched `\{_\[0-9\]\+, 0` was able to match 6 t=
imes.
>=20
> we got in the IR:
> ```
>   unsigned int _50;
>   vector(2) unsigned int _49;
> ...
>   _50 =3D MEM <unsigned int> [(uint8_t *)vectp_pix1.5_58];
>   _49 =3D {_50, 0};
> ```
>=20
>=20
> But afterwards we now get:
> ```
>   vector(4) unsigned char _50;
>   vector(8) unsigned char vect__34.9;
> ...
>   _50 =3D MEM <vector(4) unsigned char> [(uint8_t *)vectp_pix1.5_58];
>   vect__34.9_49 =3D {_50, { 0, 0, 0, 0 }};
> ```
>=20
> Which produces the exact same code. I am trying to figure out the best wa=
y to
> change the testcase pattern to make sure we don't match:
>   vect__37.23_6 =3D VEC_PERM_EXPR <vect__37.15_30, vect__37.19_13, { 0, 1=
, 2, 3,
> 8, 9, 10, 11 }>;
>=20
> too.
>=20
> `\{_\[0-9\]\+, { 0, 0` I think that will work but should I just do an
> alternative for the scan-tree-dump-times or should I put it as a seperate=
 one
> with some target selection here?

Maybe match \{_\[0-9\]\+, (0\|{ 0(, 0)+ })?  (with proper quoting)=