On Mon, Dec 14, 2009 at 5:04 PM, Daniel Jacobowitz <d...@false.org> wrote: > On Mon, Dec 14, 2009 at 04:46:59PM -0500, Jean Christophe Beyler wrote: >> My current solution: >> >> - Define a new rtl in rtl.def > > Just use an unspec or unspec_volatile. You don't need a new RTL > operation.
I thought of that but then how do I add the cost ? I also have another problem: there is a second instruction that would have the exact same signature if I use an unspec. Is there a solution for that and how do I handle the cost then ? - Just say that an unspec has a higher cost? > >> - Add the new rtl in the MD file and the generated assembly instruction >> >> However, the solution seems to work, except in O0, where I get this error: > > This means whatever is calling gen_newrtl to create the insn is not > checking operand predicates first. That's probably code you wrote > too. You are probably right, I'll move it into a register first before generating my instruction. Thanks a lot, Jc
