https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63340
rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |ASSIGNED Last reconfirmed| |2014-09-29 Assignee|unassigned at gcc dot gnu.org |rsandifo at gcc dot gnu.org Ever confirmed|0 |1 --- Comment #4 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> --- Sorry for the slow response to this. Been looking for a way out that looks reasonable, think I finally have one. The problem is to do with the union class GR_AND_FR_REGS. Before my patch this was rejected if a register underwant a mode change that is forbidden by FR_REGS, whereas after the patch it is accepted. Testing a patch now, but I expect it will need a couple of revisions.