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From: "linkw at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug ipa/102059] Incorrect always_inline diagnostic in LTO mode with
 #pragma GCC target("cpu=power10")
Date: Wed, 09 Feb 2022 07:35:24 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102059

--- Comment #35 from Kewen Lin <linkw at gcc dot gnu.org> ---
> I don't think the r12-6219 commit qualifies for backporting.  What about =
the
> comment#31 patch?  Does it address the issue for Eigen on the branches?

Got it. comment#31 patch can only address the mismatch issue on power8-fusi=
on,
it doesn't help htm. (FWIW, the previous posted patch
https://gcc.gnu.org/pipermail/gcc-patches/2022-January/587635.html doesn't
either.)

For htm issue, I think we can go with the workarounds for branches like:
  1) target attribute "cpu=3Dpower10,htm" for callers to pretend power10 ha=
ving
htm to avoid mismatch.
  2) adding -mno-htm for the whole Eigen build if it doesn't use any HTM
features.
  3) if unfortunately it does use HTM, make it fine grain to only those inl=
ined
callees with target attribute "no-htm".=