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From: "glisse at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/94908] Failure to optimally optimize certain
 shuffle patterns
Date: Fri, 01 May 2020 21:24:06 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94908

--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
Even if we write __builtin_shuffle, the vector lowering pass turns it into =
the
same code (constructor of BIT_FIELD_REFs), which seems to indicate that the
target does not handle this pattern.=