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From: "segher at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/101865] _ARCH_PWR8 is not defined when using -mcpu=power8
Date: Tue, 31 Aug 2021 16:42:14 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101865

--- Comment #16 from Segher Boessenkool <segher at gcc dot gnu.org> ---
(In reply to wschmidt from comment #14)
> I disagree with that.=C2=A0 You should use __VSX__ && _ARCH_PWR9 to check=
 for=20
> P9 vector support, etc.=C2=A0 The __POWERn_VECTOR__ things really are not=
=20
> great and I wish they had never been added.

+1

That we have corresponding TARGET_* macros internal to the backend is
one thing.  Also not great for the same reasons, but those can be useful
shorthand maybe.  But externally there should just be one authorative
source of information, and ideally there will be no N other macros that
confuse the user, or even confuse the user into thinking they are good
to use.=