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From: "gabravier at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/98648] Failure to optimize out no-op vector operation
 using andnot
Date: Thu, 14 Jan 2021 15:32:37 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98648

--- Comment #4 from Gabriel Ravier <gabravier at gmail dot com> ---
This code :

typedef int64_t v2di __attribute__((vector_size(16)));

v2di f(__m128 val)=20
{
    return (~(v2di)_mm_set_ps1(0.0f) & (v2di)val);
}

is optimized better (and is equivalent, if I understand the semantics of an=
dnps
right). Maybe the builtin for andnot should be thrown out as soon as possib=
le
(i.e. transformed into ~a & b`) ? From what I can see, `~a & b` for vectors=
 in
general is optimized to an andnot operation too.=