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From: "yinyuefengyi at gmail dot com" <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: Thu, 04 Aug 2022 10:01:15 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106069

--- Comment #32 from Xionghu Luo (luoxhu at gcc dot gnu.org) <yinyuefengyi =
at gmail dot com> ---
Thanks for all the information! It inspires to me that "native RTL should be
endian-independent". So both big-endian and little-endian platform should
generate same (vec_select (vec_concat (R0 R1) [0 4 1 5])) for altivec_vmrgh=
w,
then combine pass could do correct "nested vec_select" optimization, the en=
dian
check are left to ASM generation at last, that's the benefit for removing t=
he
UNSPECS.  My culprit patch did change the LE representation, sorry for the
stupid mistake...

Attached the fix patch.  If it is reasonable, I will continue refine it and
send to maillist.=