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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/45221] missed optimization with multiple bases and casting
Date: Sat, 06 May 2023 18:14:49 +0000
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X-Bugzilla-Component: c++
X-Bugzilla-Version: 4.6.0
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: enhancement
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D45221

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |8.0
         Resolution|---                         |FIXED
      Known to work|                            |8.1.0, 9.1.0
             Status|NEW                         |RESOLVED

--- Comment #12 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
foo1 is fixed in GCC 8.=20
foo2 (and foo1 before GCC 8) produces a trap instruction since GCC 4.9.0.
That is foo2 produces:
        testq   %rdi, %rdi
        je      .L4
        movl    4(%rdi), %eax
        ret
.L4:
        movl    8, %eax
        ud2

So I think I can close this as fixed.=