https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98482
--- Comment #5 from Uroš Bizjak <ubizjak at gmail dot com> --- (In reply to Topi Miettinen from comment #4) > Sorry, I didn't check the ABI. It seems that %r11 and maybe %r10 should be > usable: %r11 is already used as PROFILE_COUNT_REGISTER for !NO_PROFILE_COUNTERS targets.