cc0 -> CCmode questions

[Georg-Johann Lay]

Segher Boessenkool schrieb:
>> Btw, does GCC support clobbering registers in branches (or 
>> cbranch<mode>4 for that matter)?  This requirement would come up when 
>> transitioning avr to cc_mode because cbranches would live post reload.
> 
> Of course.  You cannot have *reloads* on branches, that is all.
> 
> Segher

Does this also apply to input reloads?

Suppose cbranch with constraints like

"d,r"
"n,r"

for the operands to be compared, where d is a register class that
can be compared against immediate, but registers in r can't be
compared to n in general.

For a case #2 target (only ccmode clobbers before reload), reload might
generate an input reload for the constant in the cbranch.

So this is for bidden?

Johann