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From: "bergner 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 16:09:02 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101865

--- Comment #13 from Peter Bergner <bergner at gcc dot gnu.org> ---
(In reply to Tulio Magno Quites Machado Filho from comment #12)
> There is a chance, that my previous comment is wrong with regards the
> generation of VSX instructions for Power8.
>=20
> I don't know what the second command means:
>=20
> $ gcc-11 -mcpu=3Dpower10 -dM -E - < /dev/null | grep -E 'VECTOR|VSX|ALTIV=
EC'
> #define __VSX__ 1
> #define __ALTIVEC__ 1
> #define __POWER9_VECTOR__ 1
> #define __APPLE_ALTIVEC__ 1
> #define __POWER8_VECTOR__ 1
> $ gcc-11 -mcpu=3Dpower10 -mno-power8-vector -dM -E - < /dev/null | grep -E
> 'VECTOR|VSX|ALTIVEC'
> #define __VSX__ 1
> #define __ALTIVEC__ 1
> #define __APPLE_ALTIVEC__ 1

__VSX__ doesn't mean all of VSX is enabled.  IIRC, __VSX__ is the macro you
would use to see whether you have POWER7 VSX support.  For POWER8's VSX
support, you'd use __POWER8_VECTOR__, etc.  So in your last compile, you
disabled vector support from POWER8 onwards, but that leaves vector support
from POWER7 and earlier, ie, __VSX__ and __ALTIVEC__.  If you had used
-mno-vsx, you'd still have __ALTIVEC__ and __APPLE_ALTIVEC__ defined.  Fina=
lly,
if you have used -mno-altivec, then you would have disabled all vector supp=
ort.=