https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71779
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |ra --- Comment #8 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Looking back at my old emails, this looks related to https://gcc.gnu.org/ml/gcc/2015-01/msg00125.html . The register allocator does funny things with respect to subreg.