On Sun, Oct 16, 2016 at 05:05:17PM -0500, Daniel Santos wrote: > >>The insn that's getting deleted is 75, where RCX is set. I'm starting > >>to think that maybe df_analyze() presumes that my call (to the stub) is > >>invalidating RCX, although it does not. > >It looks like you don't use add_function_usage_to on the call insn?
> Oddly enough, I had forgotten to call add_function_usage_to() on my save > stub (which I didn't post), but not the restore stub. So thanks for that > psychic intervention. :) But if you look carefully, it's there, although > it's hard to read because of all the line wrapping: > > (expr_list (use (reg:DI 4 si)) > (nil))) But shouldn't it be marked as using RCX as well? > So the bright side is that I'm learning a lot more about > gcc internals! Which is probably my main goal of this exercise. :-) Segher
