> So in order to known whether it's safe and optimal to use regs_ever_live > instead, the question is whether the passes after pass_free_cfg (are allowed > to) add or remove sets or clobbers of call_really_used_regs. I don't know > the full answer there.
pass_machine_reorg is run after pass_free_cfg and it can do pretty much what it wants so I'd think that the answer is yes. -- Eric Botcazou
