WIP

Author: serge-sans-paille

include/xsimd/arch/xsimd_emulated.hpp

@@ -230,6 +230,13 @@ namespace xsimd
             return r;
         }
 
+        // first
+        template <class A, class T, size_t N = 8 * sizeof(T) * batch<T, A>::size>
+        T XSIMD_INLINE first(batch<T, A> const& self, requires_arch<emulated<N>>) noexcept
+        {
+            return self.data[0];
+        }
+
 #if 0
         // count
         template <class A, class T, size_t N = 8 * sizeof(T) * batch<T, A>::size>

include/xsimd/arch/xsimd_sve.hpp

@@ -18,6 +18,8 @@
 
 #include "../types/xsimd_sve_register.hpp"
 
+#include <arm_neon_sve_bridge.h>
+
 namespace xsimd
 {
     template <typename T, class A, T... Values>
@@ -949,6 +951,13 @@ namespace xsimd
             return svsel(index_predicate, broadcast<A, T>(val, sve {}), arg);
         }
 
+        // first
+        template <class A, class T, typename std::enable_if<std::is_scalar<T>::value, void>::type>
+        XSIMD_INLINE T first(batch<T, A> const& self, requires_arch<sve>) noexcept
+        {
+            return first(svget_neon(self));
+        }
+
         // all
         template <class A, class T, detail::sve_enable_all_t<T> = 0>
         XSIMD_INLINE bool all(batch_bool<T, A> const& arg, requires_arch<sve>) noexcept