[Bug target/117103] GCC trunk emits push + pop at -Oz when a mov could suffice

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117103

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |INVALID
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>        mov     ecx, 2

is 5 bytes:
b9 02 00 00 00

While pop/push is only 3 bytes:


        push    2
6a 02

        pop     rcx
59

It might be 2 instructions vs 1 instruction but -Oz is making the smallest code
with no trade offs for slight performance improvements.