Ian Lance Taylor <i...@google.com> writes: > [snip] > after register allocation. After the second split, no output template > should still be "#". >
What do you mean by your last sentence? It somehow makes me think that the splits work at some preprocessing level replacing/rewriting the output template of instructions. Is that what happens? > There are cases where a processor needs a secondary reload. You need it > when you can not move between registers of two classes in a single > instruction, > I assume you by 'instruction' here mean a define_insn and not a single RTL or assembler instruction. So, assume I have two classes M_REGS and Y_REGS and I cannot move between them except if I go through an intermediary in C_REGS. Do I need a secondary reload? I wouldn't expect so cause I could write a rule that has a scratch from C_REGS. Then I move the value from SOURCE to C_REGS and from C_REGS to DEST. Have I misunderstood what you said? > and you need it when you can't load and store registers of > any class directly to/from memory. That's interesting but if you can't store/load registers of any class to and from memory how do you do it with a secondary reload anyway? Cheers, -- PMatos
