[Bug rtl-optimization/121198] [avr][hreg-constraints] error: 'asm' operand has impossible constraints or there are not enough registers

[gjl at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121198

--- Comment #6 from Georg-Johann Lay <gjl at gcc dot gnu.org> ---
Thank you.  Does this also fix PR121426, or is that an unrelated problem?

lra-assigns.cc::lra_split_hard_reg_for() reads:

  if (fail_p)
    EXECUTE_IF_SET_IN_BITMAP (&failed_reload_insns, 0, u, bi)
      {
        insn = lra_insn_recog_data[u]->insn;
        if (asm_noperands (PATTERN (insn)) >= 0)
          {
            asm_p = true;
            lra_asm_insn_error (insn);
          }
        else if (!asm_p)
          {
            error ("unable to find a register to spill");
            fatal_insn ("this is the insn:", insn);
          }
      }

so it seems the ICE only represents itself differently in inline asm vs.
machine description.