> Hi, > > I'm trying to optimize our target ABI, and I'm wondering what is the > best strategy to define it. > Is there a paper, or any hint, dealing with this topic ? > For instance, > - which ratio between call-used-reg vs "static regs" > - which ratio between arg regs vs call-used-reg > - what should be return regs > - ... > I guess this problem is very target dependent, but there are maybe > general ideas about this. > > > In particular, for now my call-used regs set is the same that arg regs > set. I noticed GCC would not use arg regs for reloading, (or would > prefer others), even if they are not actually used by function args. > and it generates extra push/pop of static regs. I there a way force > gcc preferring using "free" arg regs ? > > Thank you by advance! > > Aurélien Forget the last point. GCC does use free arg regs. The testcases I looked at were not relevant. Sorry! Aurélien
