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From: "bergner at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/106017] [PowerPC] No array-to-pointer conversion for MMA
 accumulator
Date: Fri, 17 Jun 2022 17:31:43 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106017

--- Comment #2 from Peter Bergner <bergner at gcc dot gnu.org> ---
(In reply to Segher Boessenkool from comment #1)
> So the restriction in rs6000_invalid_conversion errors for valid C progra=
ms.
> What was it intended to accomplish?

We do not want or allow automatic conversions between the opaque __vector_p=
air
and __vector_quad types and other types and those are correctly disallowed
there.  Conversions between those types needs to go through the builtins
defined for that.

As for the pointer conversions tested there, I guess they came along for the
ride?  Nemanja, do you remember the history there?  Or does LLVM allow the
pointer conversions and it's just GCC that complains?=