[Bug target/88476] Optimize expressions which uses vector, mask and general purpose registers

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88476

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
           Severity|normal                      |enhancement
   Last reconfirmed|                            |2021-09-04
     Ever confirmed|0                           |1
          Component|middle-end                  |target

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is a target issue:
Trying 22 -> 33:
   22: {r108:QI=r100:QI|r111:QI;unspec[0] 159;}
      REG_DEAD r100:QI
   33: {r116:QI=r108:QI&r112:QI;unspec[0] 159;}
      REG_DEAD r112:QI
      REG_DEAD r108:QI
Can't combine i2 into i3

The reasoning behind the unspec I suspect has gone way since r11-2796 and
r11-2795 .