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nanobenchmarks/examples.cpp

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+#include <emmintrin.h>
+
+#include "nanobenchmarks/function_registry.hpp"
+#include "numerics/cbrt.hpp"
+
+namespace principia {
+namespace nanobenchmarks {
+namespace _examples {
+
+using namespace principia::numerics::_cbrt;
+
+BENCHMARKED_FUNCTION(twice) {
+  return 2 * x;
+}
+
+BENCHMARKED_FUNCTION(thrice) {
+  return 3 * x;
+}
+
+BENCHMARKED_FUNCTION(inc) {
+  return x + 1;
+}
+
+BENCHMARKED_FUNCTION(add_4_times) {
+  return x * x * x * x * x;
+}
+
+BENCHMARKED_FUNCTION(add_16_times) {
+  return x + x + x + x + x + x + x + x + x + x + x + x + x + x + x + x + x;
+}
+
+BENCHMARKED_FUNCTION(square_root) {
+  __m128d x_0 = _mm_set_sd(x);
+  return _mm_cvtsd_f64(_mm_sqrt_sd(x_0, x_0));
+}
+
+BENCHMARKED_FUNCTION(sqrt_sqrt) {
+  __m128d x_0 = _mm_set_sd(x);
+  x_0 = _mm_sqrt_sd(x_0, x_0);
+  return _mm_cvtsd_f64(_mm_sqrt_sd(x_0, x_0));
+}
+
+BENCHMARKED_FUNCTION(square_root_division) {
+  __m128d x_0 = _mm_set_sd(x);
+  return _mm_cvtsd_f64(_mm_div_sd(x_0, _mm_sqrt_sd(x_0, x_0)));
+}
+BENCHMARK_FUNCTION(Cbrt);
+
+using namespace principia::numerics::_cbrt::internal;
+
+BENCHMARK_FUNCTION(method_3²ᴄZ5¹::Cbrt<Rounding::Faithful>);
+BENCHMARK_FUNCTION(method_3²ᴄZ5¹::Cbrt<Rounding::Correct>);
+BENCHMARK_FUNCTION(method_5²Z4¹FMA::Cbrt<Rounding::Faithful>);
+BENCHMARK_FUNCTION(method_5²Z4¹FMA::Cbrt<Rounding::Correct>);
+
+}  // namespace _examples
+}  // namespace nanobenchmarks
+}  // namespace principia