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From: "bergner at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/98959] ICE in extract_constrain_insn, at recog.c:2670
Date: Thu, 04 Feb 2021 17:01:23 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98959

--- Comment #8 from Peter Bergner <bergner at gcc dot gnu.org> ---
(In reply to Martin Li=C5=A1ka from comment #2)
> I do not set any default CPU:

The default cpu on ppc64le is (should be!) POWER8.

That said, I cannot recreate the issue with a cross build using current tru=
nk.=20
I will say that the change you identified did cause some fallout that was f=
ixed
with a later change (below) that looks related to the bad insn you are seei=
ng.=20
Maybe this is a bisec issue?  Does adding the later fix from the following
"fix" the ICE?

commit dd75498db79675a1a0b73c25e5f110969ee72d9d
Author:     Peter Bergner <bergner@linux.ibm.com>
AuthorDate: Thu Apr 16 23:26:41 2020 -0500
Commit:     Peter Bergner <bergner@linux.ibm.com>
CommitDate: Thu Apr 16 23:26:41 2020 -0500

    rs6000: Fix ICE in decompose_normal_address. [PR93974]

    Fix an ICE in decompose_normal_address(), which cannot handle Altivec A=
ND:
    addresses, by disallowing them via implementing the target hook
    rs6000_cannot_substitute_mem_equiv_p.

    gcc/
            PR rtl-optimization/93974
            * config/rs6000/rs6000.c (TARGET_CANNOT_SUBSTITUTE_MEM_EQUIV_P):
Define.
            (rs6000_cannot_substitute_mem_equiv_p): New function.

    gcc/testsuite/
            PR rtl-optimization/93974
            * g++.dg/pr93974.C: New test.

If that fixes it, are you really seeing the same ICE on current trunk?=