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From: "mkretz at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/114803] New: simd conversion to
 [[gnu::vector_size(N)]] type hits invalid code in
 experimental/bits/simd_builtin.h
Date: Mon, 22 Apr 2024 12:56:51 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: libstdc++
X-Bugzilla-Version: 14.0
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: mkretz at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114803

            Bug ID: 114803
           Summary: simd conversion to [[gnu::vector_size(N)]] type hits
                    invalid code in experimental/bits/simd_builtin.h
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: mkretz at gcc dot gnu.org
          Reporter: mkretz at gcc dot gnu.org
  Target Milestone: ---

Testcase (https://godbolt.org/z/roGdrfz85):

#include <experimental/simd>
namespace stdx =3D std::experimental;

using V =3D stdx::simd<int>;
using VB [[gnu::vector_size(16)]] =3D int;

V test(V x)
{
  auto intrin =3D static_cast<__m128i>(x);
  x =3D static_cast<V>(intrin);
  auto vb =3D static_cast<VB>(x);
  return static_cast<V>(vb);
}

The above should compile to a simple `ret`.=