Feng LI <nemoking...@gmail.com> writes: > I'm working on a gcc backend, we need to use the information of the > allocated hardware register to generate the code from builtin > functions. But at the context in ix86_expand_builtin, where I could > get the operands which the registers are pseudo registers > (REGNO(op)>FIRST_PSEUDO_REGISTER). > > Do you know where could I get the information of the hardware register > and generate assemble code from there?
At the point where ix86_expand_builtin is called, the hardware register is not known. Typically this kind of thing would be handled via a define_insn_and_split which represents the operation in some general way (probably using an UNSPEC) before reload and then splits after reload based on the registers it winds up seeing. Ian
