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From: "guihaoc 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: Wed, 25 Aug 2021 02:34:54 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101865

--- Comment #6 from HaoChen Gui <guihaoc at gcc dot gnu.org> ---
(In reply to Segher Boessenkool from comment #5)
> (In reply to HaoChen Gui from comment #4)
> > I wonder if it's a Power8 architecture when those 6 options are all
> > disabled. Or it is regressed to Power7? The "_ARCH_PWR8" represents the
> > hardware architecture or the ISA it can be taken?
>=20
> It says what version of the ISA is effective.  It should correspond to the
> -mcpu=3D used.
>=20
> Even if it would be possible to use -mcpu=3Dpower8 and then other command=
 line
> flags that set everything back to it being just like Power7 (architectura=
lly
> that is, ignoring scheduling etc.), we should still define _ARCH_PWR8.

Thanks for your comments. If it's architecturally Power7, why we still need=
 to
define _ARCH_PWR8. Does _ARCH_PWR8 impact anything during the compiling? Co=
uld
we just use mcpu instead? Seems _ARCH_PWR8 only affects instruction selecti=
on
right now.=