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
