Add XSIMD implementation

include/trigdx/lookup_xsimd.hpp

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <cstddef>
+#include <memory>
+
+#include "interface.hpp"
+
+template <std::size_t NR_SAMPLES> class LookupXSIMDBackend : public Backend {
+public:
+  LookupXSIMDBackend();
+  ~LookupXSIMDBackend() override;
+
+  void init(size_t n = 0) override;
+  void compute_sinf(std::size_t n, const float *x, float *s) const override;
+  void compute_cosf(std::size_t n, const float *x, float *c) const override;
+  void compute_sincosf(std::size_t n, const float *x, float *s,
+                       float *c) const override;
+
+private:
+  struct Impl;
+  std::unique_ptr<Impl> impl;
+};