Dear all, 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 ? I've been looking at what happens for the Itanium since you'd have the same problem if you had to use big numbers. You would in theory prefer to not use too many move long instructions since they use two slots in the bundle. But I fail to see if anything is really done in that respect. Thanks for your help, Jean Christophe Beyler
