sumanth <sumanth.gundapneni@xxxxxxxxxxxxxxxxxx> writes: > How can I generate a load instruction with pc-relative accessing of > "global" variables. > As far as I know I need to modify GO_IF_LEGITIMATE_ADDRESS > X is an RTX ; 1. GET_CODE (X) == PC + offset > 2. GET_CODE (X) == LABEL_REF or GET_CODE > (X) == SYMBOL_REF > and split the label to PC + offset (if possible) . > > The problem here is how can I keep data in PC + offset and tell my > compiler. The only reference is in arm as far as I know. > Its some thing like > "a = 10 " is a global variable and i need to load its address it in > to register r0. > 120 ld r0(destination), pc ,#4 > 124 0x2345678e > value 10 is in 0x2345678e > > Can any one help me in this regard . This sort of thing is often done in the LEGITIMIZE_ADDRESS macro. Your case looks a bit complicated and probably requires an UNSPEC. You will also want to consider a constant pool. I think the SH has some cases like yours, but I'm not sure. Ian
