[Bug target/116512] [12/13/14/15 Regression] vzeroupper emitted even though the upper half of the z registers are returned

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116512

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2024-08-28
     Ever confirmed|0                           |1
           Keywords|                            |wrong-code
             Status|UNCONFIRMED                 |NEW

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Hongtao Liu from comment #4)
> gdb shows crtl->return_rtx is
> 
> 21(parallel/i:BLK [                                                         
> 
> 22        (expr_list:REG_DEP_TRUE (reg:XI 20 xmm0)                          
> 
> 23            (const_int 0 [0]))                                            
> 
> 24    ])

Oh, so ix86_avx_u128_mode_exit does not understand parallel here.