1 files changed, 44 insertions, 0 deletions
diff --git a/third_party/xsimd/include/xsimd/arch/xsimd_sse4_2.hpp b/third_party/xsimd/include/xsimd/arch/xsimd_sse4_2.hpp
new file mode 100644
index 0000000000..8f9b7a76e6
--- /dev/null
+++ b/third_party/xsimd/include/xsimd/arch/xsimd_sse4_2.hpp
@@ -0,0 +1,44 @@
+/***************************************************************************
+ * Copyright (c) Johan Mabille, Sylvain Corlay, Wolf Vollprecht and         *
+ * Martin Renou                                                             *
+ * Copyright (c) QuantStack                                                 *
+ * Copyright (c) Serge Guelton                                              *
+ *                                                                          *
+ * Distributed under the terms of the BSD 3-Clause License.                 *
+ *                                                                          *
+ * The full license is in the file LICENSE, distributed with this software. *
+ ****************************************************************************/
+
+#ifndef XSIMD_SSE4_2_HPP
+#define XSIMD_SSE4_2_HPP
+
+#include <limits>
+
+#include "../types/xsimd_sse4_2_register.hpp"
+
+namespace xsimd
+{
+
+    namespace kernel
+    {
+        using namespace types;
+
+        // lt
+        template <class A>
+        inline batch_bool<int64_t, A> lt(batch<int64_t, A> const& self, batch<int64_t, A> const& other, requires_arch<sse4_2>) noexcept
+        {
+            return _mm_cmpgt_epi64(other, self);
+        }
+        template <class A>
+        inline batch_bool<uint64_t, A> lt(batch<uint64_t, A> const& self, batch<uint64_t, A> const& other, requires_arch<sse4_2>) noexcept
+        {
+            auto xself = _mm_xor_si128(self, _mm_set1_epi64x(std::numeric_limits<int64_t>::lowest()));
+            auto xother = _mm_xor_si128(other, _mm_set1_epi64x(std::numeric_limits<int64_t>::lowest()));
+            return _mm_cmpgt_epi64(xother, xself);
+        }
+
+    }
+
+}
+
+#endif