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From: "rodgertq at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/102586] [12 Regression] ICE in
 clear_padding_type, at gimple-fold.c:4798 since r12-3433-ga25e0b5e6ac8a77a
Date: Fri, 11 Feb 2022 01:47:41 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102586

--- Comment #20 from Thomas Rodgers <rodgertq at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #17)
...

> I don't remember the std::bit_cast case right now, OpenMP atomics are abo=
ut

Not sure if this is what you are talking about (frankly most of this is well
above my grokability) but, for std::bit_cast<To, From>, the standard says -

"Constraints:
=E2=80=94(1.1) sizeof(To) =3D=3D sizeof(From) is true;
=E2=80=94(1.2) is_trivially_copyable_v<To> is true; and
=E2=80=94(1.3) is_trivially_copyable_v<From> is true"

So same as for <atomic>=