[Bug target/91469] [10 Regression] ICE in extract_insn, at recog.c:2310 since r274481

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91469

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Elsewhere we have sth with similar effect, but only disqualifying toplevel MEM.

      if (!MEM_P (src))
        {
          replace_with_subreg_in_insn (insn, reg, reg);
          bitmap_clear_bit (conv, INSN_UID (insn));
        }

and

            if (!MEM_P (dst) || !REG_P (src))
              replace_with_subreg_in_insn (insn, reg, reg);

in the end it might be an ordering issue of splitting out memory operands
and converting regs (convert_registers vs. convert_insn).