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From: "bergner at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/100085] Bad code for union transfer from __float128 to
 vector types
Date: Wed, 09 Jun 2021 21:35:54 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100085

--- Comment #11 from Peter Bergner <bergner at gcc dot gnu.org> ---
(In reply to luoxhu from comment #9)
> But for __float128 to __int128 mentioned in #c4, need hack
> rs6000_modes_tieable_p
> to remove the stack operation in dse1. But I am not sure this is *LEGAL*
> since TImode is allocated to GPR, It seems not true to access TImode from
> ALTIVEC or VSX without copying?

We used to have a -mvsx-timode option which allowed TImode pseudos into the=
 VSX
registers.  We deprecated the option a while back and basically always allow
TImode in the VSX registers now.  I would say we even prefer them in VSX
registers over GOR registers.  The only "issue" is that our ABIs define
parameter passing and return values for TImode values go through the GPRs. =
:-(=