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From: "bergner at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/94123] [10 regression] r10-1734, SVN r273240, causes
 gcc.target/powerpc/pr87507.c to fail
Date: Fri, 20 Mar 2020 14:13:13 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94123

Peter Bergner <bergner at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rguenth at gcc dot gnu.org

--- Comment #6 from Peter Bergner <bergner at gcc dot gnu.org> ---
(In reply to Segher Boessenkool from comment #5)
> Confirmed.
>=20
> On p9 it is all fine.
>=20
> On p7 it is worse, you get std's followed by an lxvd2x from the same stack
> address (big LHS/SHL hazard there), and then two stxvd2x.
>=20
> On p8 the TImode values aren't split at all, not until final output anywa=
y.

My fix for PR87507 allowed them to be split early so they could be optimize=
d,
so this must have regressed without us seeing it.  I'll have a quick look at
what is happening.

Richi, given this is a performance issue for TImode values, is there a reas=
on
you want this as a P1 bug?=