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From: "sjames at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/114339] [14 regression] Tor miscompiled with
 -O2 -mavx -fno-vect-cost-model
Date: Thu, 14 Mar 2024 18:34:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114339

--- Comment #1 from Sam James <sjames at gcc dot gnu.org> ---
The assert is at
https://gitlab.torproject.org/tpo/core/tor/-/blob/tor-0.4.8.10/src/feature/=
client/entrynodes.c#L2072

```
(gdb) p delays
$3 =3D {{
    maximum =3D 21600,
    primary_delay =3D 600,
    nonprimary_delay =3D 3600
  }, {
    maximum =3D 345600,
    primary_delay =3D 5400,
    nonprimary_delay =3D 14400
  }, {
    maximum =3D 604800,
    primary_delay =3D 14400,
    nonprimary_delay =3D 64800
  }, {
    maximum =3D 9223372036854775807,
    primary_delay =3D 32400,
    nonprimary_delay =3D 129600
  }}
(gdb)
```

The bad loop (confirmed w/ novector pragma) is:
  for (i =3D 0; i < ARRAY_LENGTH(delays); ++i) {
    if (tdiff <=3D delays[i].maximum) {
      return is_primary ? delays[i].primary_delay : delays[i].nonprimary_de=
lay;
    }
  }=