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From: "pinskia at gcc dot gnu.org" <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 05:15:28 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D115304

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pinskia at gcc dot gnu.org

--- Comment #12 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note when I am adding V4QI support to the aarch64 backend (emulating it via
V8QI), I am getting a failure in slp-gap-1.c but it is different from the
others.

Without V4QI, the pattern matched `\{_\[0-9\]\+, 0` was able to match 6 tim=
es.

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};
```


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 }};
```

Which produces the exact same code. I am trying to figure out the best way =
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 }>;

too.

`\{_\[0-9\]\+, { 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 o=
ne
with some target selection here?=