"Lucas \(a.k.a T-Bird or bsdfan3\)" <[EMAIL PROTECTED]> writes:
> 1) What would need to be done to reg-stack.c to allow other ports > besides i386 to use it? (support for multiple-stack machines would be > REALLY nice, but rather far off) (any other ideas?) reg-stack.c is pretty closed tied to the x87 FP instructions used on IA32. It has specific knowledge of which instructions use which slots on the stack, e.g., in subst_stack_regs_pat. More seriously, I don't think the general approach of treating every stack slot as a hard register and then turning that into stack manipulation is going to give you optimal code. If you are compiling for a stack machine, I would think that you should select instructions and allocate registers with the stack architecture in mind. But if you are committed to using gcc, then using something along the lines of reg-stack.c may be your best bet. > 2) I found a minor bug in the header comment for reg-stack.c -- when > whoever wrote the comment documented "push" insns, they said SET_DEST > was two things at the same time and never said what SET_SRC was! Is > the SET_DEST supposed to be FIRST_STACK_REG, or a plain REG or MEM? It should read: A "push" or "load" insn is a SET whose SET_DEST is FIRST_STACK_REG and whose SET_SRC is REG or MEM. Ian
