Hi Claudiu, On Tue, Sep 04, 2018 at 11:11:44AM +0200, Claudiu Zissulescu wrote: > I am trying to get LRA fully working for ARC, but I've got an issue. > Whenever, LRA analyses an instruction having (clobber > (match_scratch:SI 3 "=X, ...)) in its pattern I hit the assert in > lra-constraints.c:4101, and it seems it has to do with the scratch's > 'X' constraint. > Do I miss something? Is there any limitation between LRA and scratch > operands having in their alternative 'X' constraint?
There are other targets with =X in an alternative for a clobber match_scratch, like rs6000, and that does work fine with LRA. It doesn't hit that assert, anyway ;-) Do you have some debug output to show what is going on here? Segher
