https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88714
--- Comment #15 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Ah, except that isn't all that r265398 did. It has both the make_more_copies
part and
|| (HARD_REGISTER_P (dest)
- && ! TEST_HARD_REG_BIT (fixed_reg_set, REGNO (dest))
- && targetm.class_likely_spilled_p (REGNO_REG_CLASS (REGNO
(dest))))))
+ && ! TEST_HARD_REG_BIT (fixed_reg_set, REGNO (dest)))))
hunk in cant_combine_insn_p. If I revert both, then it works properly, but as
I said, not doing make_more_copies alone or reverting this
class_likely_spilled_p check alone doesn't fix it.
