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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/102733] missing fs:0 store when followed by
 one to gs:0
Date: Fri, 02 Jun 2023 03:54:33 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102733

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Created attachment 55238
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D55238&action=3Dedit
Patch which I will be testing

This adds a check for the address space in DSE.

Even tested:
```
void test_null_store_fs_gs (void)
{
  int __seg_fs *fs =3D (int __seg_fs *)0;
  *fs =3D 1;=20

  int __seg_gs *gs =3D (int __seg_gs *)0;
  *gs =3D 2;=20=20
  *fs =3D 3;=20
}
```

And only 2/3 are emitted (in that order) which is the correct DSE even.=