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

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

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

--- Comment #4 from Hongtao Liu <liuhongt at gcc dot gnu.org> ---
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    ])