From 0d227d85b4180002a26e55123677b41d2469e9a7 Mon Sep 17 00:00:00 2001
From: serge-sans-paille <sergesanspaille@free.fr>
Date: Sat, 1 Nov 2025 15:59:36 +0100
Subject: [PATCH 1/2] Fix widen implementation on arm64

---
 include/xsimd/arch/xsimd_neon64.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/xsimd/arch/xsimd_neon64.hpp b/include/xsimd/arch/xsimd_neon64.hpp
index 7cb531be9..565747446 100644
--- a/include/xsimd/arch/xsimd_neon64.hpp
+++ b/include/xsimd/arch/xsimd_neon64.hpp
@@ -1551,7 +1551,7 @@ namespace xsimd
         /*********
          * widen *
          *********/
-        template <class A, class T>
+        template <class A>
         XSIMD_INLINE std::array<batch<double, A>, 2> widen(batch<float, A> const& x, requires_arch<neon64>) noexcept
         {
             return { batch<double, A>(vcvt_f64_f32(vget_low_f32(x))), batch<double, A>(vcvt_high_f64_f32(x)) };

From a8ef17e15c0ab1ea902208a9c1a9c8411803a40f Mon Sep 17 00:00:00 2001
From: serge-sans-paille <sergesanspaille@free.fr>
Date: Sat, 1 Nov 2025 12:22:08 +0100
Subject: [PATCH 2/2] Add support for xsimd::widen on PowerPC/VSX

Related to #1179
---
 include/xsimd/arch/xsimd_vsx.hpp | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/include/xsimd/arch/xsimd_vsx.hpp b/include/xsimd/arch/xsimd_vsx.hpp
index 593346d4c..1ed91e0df 100644
--- a/include/xsimd/arch/xsimd_vsx.hpp
+++ b/include/xsimd/arch/xsimd_vsx.hpp
@@ -17,6 +17,7 @@
 #include <type_traits>
 
 #include "../types/xsimd_vsx_register.hpp"
+#include "./common/xsimd_common_cast.hpp"
 
 #include <endian.h>
 
@@ -873,6 +874,20 @@ namespace xsimd
             return vec_trunc(self.data);
         }
 
+        // widen
+        template <class A>
+        XSIMD_INLINE std::array<batch<double, A>, 2> widen(batch<float, A> const& x, requires_arch<vsx>) noexcept
+        {
+            return { batch<double, A>(vec_doublel(x.data)), batch<double, A>(vec_doubleh(x.data)) };
+        }
+        template <class A, class T, class = typename std::enable_if<std::is_scalar<T>::value>::type>
+        XSIMD_INLINE std::array<batch<widen_t<T>, A>, 2> widen(batch<T, A> const& x, requires_arch<vsx>) noexcept
+        {
+            auto even = vec_mule(x.data, vec_splats(T(1))); // x0, x2, x4, x6
+            auto odd = vec_mulo(x.data, vec_splats(T(1))); // x1, x3, x5, x7
+            return { batch<widen_t<T>, A>(vec_mergel(even, odd)), batch<widen_t<T>, A>(vec_mergeh(even, odd)) };
+        }
+
         // zip_hi
         template <class A, class T, class = typename std::enable_if<std::is_scalar<T>::value>::type>
         XSIMD_INLINE batch<T, A> zip_hi(batch<T, A> const& self, batch<T, A> const& other, requires_arch<vsx>) noexcept