https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95646
avieira at gcc dot gnu.org changed: What |Removed |Added ---------------------------------------------------------------------------- Last reconfirmed| |2020-06-15 Ever confirmed|0 |1 Status|UNCONFIRMED |NEW --- Comment #1 from avieira at gcc dot gnu.org --- Reproduced and confirmed. This is because we special treat HI_REGS in Thumb-1 when optimizing for size. I have a fix ready, just doing some testing.