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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/108684] [12/13 Regression] ICE: verify_ssa
 failed
Date: Tue, 07 Feb 2023 19:56:32 +0000
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X-Bugzilla-Type: changed
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: ice-on-valid-code, inline-asm, wrong-code
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X-Bugzilla-Who: pinskia at gcc dot gnu.org
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108684

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Keywords|                            |wrong-code

--- Comment #8 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I think simple_dce_from_worklist is incorrect of removing this inline-asm in
the first place.
Take:
```
static int t;

int f (int *a)
{
  int t1;
  asm (" " : "=3Dr" (t1) : : "memory");
  t =3D t1;
  return *a;
}
```
The inline-asm could have written to *a but now it has been removed.

Let me look into fixing that.
Note my patch (r12-4598-g113860301f46d14a255bd) exposed this even before VRP
exposed this so I feel like I should fix this.=