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From: "qinzhao 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 15:44:40 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97715

--- Comment #6 from qinzhao at gcc dot gnu.org ---
(In reply to Jakub Jelinek from comment #3)
> ;; Floating-point register constraints.
> (define_register_constraint "f"
>  "TARGET_80387 || TARGET_FLOAT_RETURNS_IN_80387 ? FLOAT_REGS : NO_REGS"
>  "Any 80387 floating-point (stack) register.")
>=20
> So, zero_all_st_registers really should just
>   if (!TARGET_80387 && !TARGET_FLOAT_RETURNS_IN_80387)
>     return false;
> somewhere early.

I can do this to avoid the ICE. however, the st/mm register set will NOT be
zeroed under such situation when user requests to zero them with
-fzero-call-used-regs=3Dall.=