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From: "aoliva at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/114803] simd conversion to [[gnu::vector_size(N)]]
 type hits invalid code in experimental/bits/simd_builtin.h
Date: Fri, 31 May 2024 10:59:41 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114803

--- Comment #10 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
FWIW, I can trigger the problem on arm-eabi (and presumably also on
aarch64-elf, but I haven't tried that) with -D__clang__.

(our vxworks toolchains have to define that macro, for complicated reasons)

here's a reduced testcase:

arm-eabi-g++ ~/pr114803.cc -mfpu=3Dneon -mfloat-abi=3Dhard -O0 -std=3Dgnu++=
17
-D__clang__ [-funsigned-char]

include <experimental/simd>

template <typename T>
void
test()
{
  using V =3D std::experimental::simd<T,
std::experimental::simd_abi::_VecBuiltin<16> >;
  if constexpr (std::is_signed_v<T>)
    static_cast<int8x16_t>(V{});
  else
    static_cast<uint8x16_t>(V{});
}

int main()
{
  test<char>();
}

pr114803.cc: In instantiation of =E2=80=98void test() [with T =3D char]=E2=
=80=99:
pr114803.cc:16:   required from here
pr114803.cc:11: error: invalid =E2=80=98static_cast=E2=80=99 from type
=E2=80=98std::experimental::parallelism_v2::simd<char,
std::experimental::parallelism_v2::simd_abi::_VecBuiltin<16> >=E2=80=99 to =
type
=E2=80=98uint8x16_t=E2=80=99=