[Bug rtl-optimization/32629] missing CSE for constant in registers / inefficient memset

[hubicka at ucw dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=32629

--- Comment #6 from Jan Hubicka <hubicka at ucw dot cz> ---
> We could also make $0 a not legitimate constant on x86... (and undo that late
> with a peephole2)

I tried that in 90's. At that time it increased register pressure and was not
win...

Honza