> Von: Segher Boessenkool <segher@xxxxxxxxxxxxxxxxxxx> > Gesendet: Freitag, 26. März 2021 23:10 > > Hi! > > On Thu, Mar 25, 2021 at 03:21:29PM +0100, Stefan Franke wrote: > > (insn 8 7 9 2 (set (reg:SI 41) > > (reg/f:SI 40)) > > (expr_list:REG_INC (reg:SI 41) > > (nil))) > > REG_INC notes are only valid on insns containing a post_inc expression. > This usually is inside a mem, but it doesn't have to be. So this would be > > (set (reg:SI 41) > (post_inc:SI (reg:SI 40))) > Well I'am (ab)using it as a marker: this register is used elsewhere in post_inc insns. This avoids by simply testing the presence of this note the folding/combing/etc.pp in cse, gcse and cprop. Would it be better to add a new note flavour? REG_USED_IN_INC? Stefan
