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From: "linkw at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/103623] [12 Regression] error: unable to generate
 reloads (ICE in curr_insn_transform, at lra-constraints.c:4132), or error:
 insn does not satisfy its constraints (ICE in extract_constrain_insn_cached,
 at recog.c:2682)
Date: Fri, 10 Dec 2021 09:11:27 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103623

--- Comment #2 from Kewen Lin <linkw at gcc dot gnu.org> ---

> One fix seems to introduce one stanza for 128bit long double like previous
> RS6000_BTM_LDBL128 which is enabled only if (TARGET_LONG_DOUBLE_128 &&
> TARGET_HARD_FLOAT && !TARGET_IEEEQUAD), and guard
> __builtin_{pack,unpack}_longdouble under this new stanza.
>=20

PR103624 made me notice that a lightweight attribute may be better for this=
.=