https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105778
--- Comment #6 from Uroš Bizjak <ubizjak at gmail dot com> --- (In reply to Jakub Jelinek from comment #4) > It is the same thing done a few lines later in the preexisting code too. > Shall I all of those change to gen_lowpart (QImode, force_reg (GET_MODE > (operands[2]), operands[2])) then? Yes, please. A "register_operand" predicate accepts SUBREGs of some strange mode (usually FP mode) registers, and gen_lowpart chokes on these.
