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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/115201] Recursion not optimized for structs
 arguments
Date: Thu, 23 May 2024 03:26:56 +0000
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X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 14.1.1
X-Bugzilla-Keywords: FIXME, missed-optimization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D115201

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |FIXME
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=3D17749

--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
              /* The parameter should be a real operand, so that phi node
                 created for it at the start of the function has the meaning
                 of copying the value.  This test implies is_gimple_reg_type
                 from the previous condition, however this one could be
                 relaxed by being more careful with copying the new value
                 of the parameter (emitting appropriate GIMPLE_ASSIGN and
                 updating the virtual operands).  */

So this has been a known issue for a long time now.=