"Balaji V. Iyer" <bvi...@ncsu.edu> writes: > This is what I want to do: I want the scheduling phase to say an RTX X > must be allocated registers from Register CLASS A. So how can I tell > register allocator to do this?
Not in any convenient way, no. The closest you could come would be to have several different copies of the insn, which used different register classes, and have some machine-dependent part of your scheduler generate that insn. That would be quite awkward. You might be better off extending the compiler to somehow permit register classes to examine the insn attributes, and also extending the compiler to permit the scheduler to somehow set attributes for an insn. In general gcc's support for VLIW machines is weak. Ian
