hi,
does this one(idea) related to program independent code (pic).
Thanks,
Sumanth
Ian Lance Taylor wrote:
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
