+2023-05-24 Matthias Kretz <m.kretz@gsi.de>
+
+ Backported from master:
+ 2023-05-24 Matthias Kretz <m.kretz@gsi.de>
+
+ PR libstdc++/109949
+ * include/experimental/bits/simd.h (__intrinsic_type): If
+ __ALTIVEC__ is defined, map gnu::vector_size types to their
+ corresponding __vector T types without losing unsignedness of
+ integer types. Also prefer long long over long.
+ * include/experimental/bits/simd_ppc.h (_S_popcount): Cast mask
+ object to the expected unsigned vector type.
+
+2023-05-24 Matthias Kretz <m.kretz@gsi.de>
+
+ Backported from master:
+ 2023-05-24 Matthias Kretz <m.kretz@gsi.de>
+
+ PR libstdc++/109261
+ * include/experimental/bits/simd.h (__intrinsic_type):
+ Specialize __intrinsic_type<double, 8> and
+ __intrinsic_type<double, 16> in any case, but provide the member
+ type only with __aarch64__.
+
+2023-05-24 Matthias Kretz <m.kretz@gsi.de>
+
+ Backported from master:
+ 2023-05-24 Matthias Kretz <m.kretz@gsi.de>
+
+ PR libstdc++/109261
+ * include/experimental/bits/simd_neon.h (_S_reduce): Add
+ constexpr and make NEON implementation conditional on
+ not __builtin_is_constant_evaluated.
+
2023-05-23 Matthias Kretz <m.kretz@gsi.de>
Backported from master: