[gcc r12-10426] libstdc++: Avoid ill-formed types on ARM

[Matthias Kretz via Gcc-cvs]

https://gcc.gnu.org/g:b3097e01cd5d32e9825b7b87dff12b3247bd9819

commit r12-10426-gb3097e01cd5d32e9825b7b87dff12b3247bd9819
Author: Matthias Kretz <m.kr...@gsi.de>
Date:   Wed Apr 17 09:11:25 2024 +0200

    libstdc++: Avoid ill-formed types on ARM
    
    This resolves failing tests in check-simd.
    
    Signed-off-by: Matthias Kretz <m.kr...@gsi.de>
    
    libstdc++-v3/ChangeLog:
    
            PR libstdc++/114750
            * include/experimental/bits/simd_builtin.h
            (_SimdImplBuiltin::_S_load, _S_store): Fall back to copying
            scalars if the memory type cannot be vectorized for the target.
    
    (cherry picked from commit 0fc7f3c6adc8543f55ec35b309016d9d9c4ddd35)

Diff:
---
 libstdc++-v3/include/experimental/bits/simd_builtin.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libstdc++-v3/include/experimental/bits/simd_builtin.h 
b/libstdc++-v3/include/experimental/bits/simd_builtin.h
index 51034fec6931..e060816c6eac 100644
--- a/libstdc++-v3/include/experimental/bits/simd_builtin.h
+++ b/libstdc++-v3/include/experimental/bits/simd_builtin.h
@@ -1464,7 +1464,7 @@ template <typename _Abi, typename>
                   [&](auto __i) constexpr {
                     return static_cast<_Tp>(__i < _Np ? __mem[__i] : 0);
                   });
-       else if constexpr (sizeof(_Up) > 8)
+       else if constexpr (sizeof(_Up) > 8 or __vectorized_sizeof<_Up>() <= 
sizeof(_Up))
          return __generate_vector<_Tp, _SimdMember<_Tp>::_S_full_size>(
                   [&](auto __i) constexpr _GLIBCXX_SIMD_ALWAYS_INLINE_LAMBDA {
                     return static_cast<_Tp>(__i < _Np ? __mem[__i] : 0);
@@ -1536,7 +1536,7 @@ template <typename _Abi, typename>
            for (size_t __i = 0; __i < _Np; ++__i)
              __mem[__i] = __v[__i];
          }
-       else if constexpr (sizeof(_Up) > 8)
+       else if constexpr (sizeof(_Up) > 8 or __vectorized_sizeof<_Up>() <= 
sizeof(_Up))
          __execute_n_times<_Np>([&](auto __i) constexpr 
_GLIBCXX_SIMD_ALWAYS_INLINE_LAMBDA {
            __mem[__i] = __v[__i];
          });