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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/97715] [11 Regression] ICE in insn_default_length, at
 config/i386/i386.md:15325 since r11-4578-gd10f3e900b0377b4
Date: Wed, 04 Nov 2020 18:09:33 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97715

--- Comment #19 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
And, actually the function.c change is probably unnecessary, because the
      if (!crtl->abi->clobbers_full_reg_p (regno))
        continue;
      if (!fixed_regs[i])
        continue;
should already rule them out.
  operand_reg_set &=3D accessible_reg_set;
...
      /* If a register is too limited to be treated as a register operand,
         then it should never be allocated to a pseudo.  */
      if (!TEST_HARD_REG_BIT (operand_reg_set, i))
        fixed_regs[i] =3D 1;=