[Bug target/118594] expansion of bf16 to float should not produce (subreg (mem ())

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118594

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
           Assignee|unassigned at gcc dot gnu.org      |pinskia at gcc dot 
gnu.org
            Summary|vreg does not handle        |expansion of bf16 to float
                   |`SUBREG (MEM                |should not produce (subreg
                   |(virtual-incoming-args))`   |(mem ())
                   |correctly                   |
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2025-01-21
          Component|middle-end                  |target

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
https://gcc.gnu.org/pipermail/gcc/2016-October/222026.html
https://gcc.gnu.org/pipermail/gcc/2018-May/226253.html
https://gcc.gnu.org/pipermail/gcc/2014-March/213017.html


So looks like we should not produce this subreg in the first place . I am
suspecting it is a target issue when expanding the conversion from BF16 to
float. Maybe a missing force reg before taking the subreg.