https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88178
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
void foo (void)
{
register int r19 asm ("19");
}
ICEs with -g too.
Similar effects with "16", "argp" or "frame".
Guess it would be nice to reject these regs somewhere early, but there doesn't
seem to be a target hook for that. There is accessible_reg_set which only mips
uses, wonder if we could make them unaccessible and what effect that would
have.
I think it removes those registers from operand_reg_set and thus they wouldn't
be general_operand though.
With "19" this started with r264676, with "frame" the ICE started probably with
r186837.
