Jean Christophe Beyler <jean.christophe.bey...@gmail.com> writes: > I'm currently working on removing the constant folding and constant > propagation because, on the architecture I'm working on, it is highly > costly to move a constant into a register if the number is big (we can > say over 16 bits). > > Currently, I've been looking into this and it seems that I have to > hack into the fold-const.c file, CCP, SCCVN and probably the propagate > passes to tell the compiler to be careful if the number is too big. > But I'm sure there are many other places I'll have to hack and slash > to tell him to stop the folding and propagation. Is there an easier > way to do this ?
This type of thing is normally controlled by the TARGET_RTX_COSTS hook. E.g., see the handling of CONST_INT mips_rtx_costs in config/mips/mips.c. Ian
