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From: "segher at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/106069] [12/13 Regression] wrong code with -O
 -fno-tree-forwprop -maltivec on ppc64le
Date: Wed, 03 Aug 2022 18:01:04 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106069

--- Comment #27 from Segher Boessenkool <segher at gcc dot gnu.org> ---
IMO what vec_select calls element 0 is always in the first argument of the
vec_concat it works on, in BE as well as LE.  But yes this is quite
underdefined
in our documentation, and who know what is actually implemented, in targets=
 as
well as in generic code :-(=