[Bug tree-optimization/94086] Missed optimization when converting a bitfield to an integer on x86-64

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94086

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2020-03-09

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.  This is another task for a combined bswap/store-merging where the
bswap tracking would need to be extended to cover bits.

Also part of the reason for the missed optimization is that on GIMPLE we
think 'half' is memory but in reality it is in a register.