[Bug target/114591] [12/13/14 Regression] register allocators introduce an extra load operation since gcc-12

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114591

--- Comment #11 from Hongtao Liu <liuhongt at gcc dot gnu.org> ---
unsigned v;
long long v2;
char foo ()
{
    v2 = v;
    return v;
}

This is related to *movqi_internal, and codegen has been worse since gcc8.1

foo:
        movl    v(%rip), %eax
        movq    %rax, v2(%rip)
        movzbl  v(%rip), %eax
        ret