[Bug target/39549] Nonoptimal byte load. mov (%rdi),%al better then movzbl (%rdi),%eax

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=39549

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |WONTFIX
             Target|                            |x86_64
             Status|NEW                         |RESOLVED

--- Comment #2 from Drea Pinski <pinskia at gcc dot gnu.org> ---
So this won't be fixed as there is a penality for using %al for the load since
it depends on the previous instruction that writes on eax.

It is done for -Os already.