gcc/libstdc++-v3/testsuite/std/simd/simd_alg.cc

// { dg-do run { target c++26 } }
// { dg-require-effective-target x86 }

#include "test_setup.h"
#include <utility>

template <typename V>
  struct Tests
  {
    using T = typename V::value_type;

    using M = typename V::mask_type;

    using pair = std::pair<V, V>;
    static constexpr std::conditional_t<std::is_floating_point_v<T>, short, T> x_max
      = test_iota_max<V, 1>;
    static constexpr int x_max_int = static_cast<int>(x_max);

    static constexpr V
    reverse_iota(const V x)
    {
      if constexpr (std::is_enum_v<T>)
	{
	  using Vu = simd::rebind_t<std::underlying_type_t<T>, V>;
	  return static_cast<V>(std::to_underlying(x_max) - static_cast<Vu>(x));
	}
      else
	return x_max - x;
    }

    ADD_TEST(Select) {
      std::tuple{test_iota<V, 0, 63>, test_iota<V, 1, 64>, T(2),
		 M([](int i) { return 1 == (i & 1); }),
		 M([](int i) { return 1 == (i % 3); })},
      [](auto& t, const V x, const V y, const T z, const M k, const M k3) {
	t.verify_equal(select(M(true), x, y), x);
	t.verify_equal(select(M(false), x, y), y);
	t.verify_equal(select(M(true), y, x), y);
	t.verify_equal(select(M(false), y, x), x);
	t.verify_equal(select(k, x, T()),
		       V([](int i) { return (1 == (i & 1)) ? T(i & 63) : T(); }));

	t.verify_equal(select(M(true), z, T()), z);
	t.verify_equal(select(M(true), T(), z), V());
	t.verify_equal(select(k, z, T()), V([](int i) { return (1 == (i & 1)) ? T(2) : T(); }));
	t.verify_equal(select(k3, z, T()), V([](int i) { return (1 == (i % 3)) ? T(2) : T(); }));
      }
    };

    ADD_TEST(Min, std::totally_ordered<T>) {
      std::tuple{test_iota<V, 0, -1>, reverse_iota(test_iota<V, 0, -1>), test_iota<V, 1>},
      [](auto& t, const V x, const V y, const V x1) {
	t.verify_equal(min(x, x), x);
	t.verify_equal(min(V(), x), V());
	t.verify_equal(min(x, V()), V());
	if constexpr (std::is_signed_v<T>)
	  {
	    t.verify_equal(min(-x, x), -x);
	    t.verify_equal(min(x, -x), -x);
	  }
	t.verify_equal(min(x1, x), x);
	t.verify_equal(min(x, x1), x);
	t.verify_equal(min(x, y), min(y, x));
	t.verify_equal(min(x, y), V([](int i) {
				    i %= x_max_int;
				    return std::min(T(x_max_int - i), T(i));
				  }));
      }
    };

    ADD_TEST(Max, std::totally_ordered<T>) {
      std::tuple{test_iota<V, 0, -1>, reverse_iota(test_iota<V, 0, -1>), test_iota<V, 1>},
      [](auto& t, const V x, const V y, const V x1) {
	t.verify_equal(max(x, x), x);
	t.verify_equal(max(V(), x), x);
	t.verify_equal(max(x, V()), x);
	if constexpr (std::is_signed_v<T>)
	  {
	    t.verify_equal(max(-x, x), x);
	    t.verify_equal(max(x, -x), x);
	  }
	t.verify_equal(max(x1, x), x1);
	t.verify_equal(max(x, x1), x1);
	t.verify_equal(max(x, y), max(y, x));
	t.verify_equal(max(x, y), V([](int i) {
				    i %= x_max_int;
				    return std::max(T(x_max_int - i), T(i));
				  }));
      }
    };

    ADD_TEST(Minmax, std::totally_ordered<T>) {
      std::tuple{test_iota<V, 0, -1>, reverse_iota(test_iota<V, 0, -1>), test_iota<V, 1>},
      [](auto& t, const V x, const V y, const V x1) {
	t.verify_equal(minmax(x, x), pair{x, x});
	t.verify_equal(minmax(V(), x), pair{V(), x});
	t.verify_equal(minmax(x, V()), pair{V(), x});
	if constexpr (std::is_signed_v<T>)
	  {
	    t.verify_equal(minmax(-x, x), pair{-x, x});
	    t.verify_equal(minmax(x, -x), pair{-x, x});
	  }
	t.verify_equal(minmax(x1, x), pair{x, x1});
	t.verify_equal(minmax(x, x1), pair{x, x1});
	t.verify_equal(minmax(x, y), minmax(y, x));
	t.verify_equal(minmax(x, y),
		       pair{V([](int i) {
			      i %= x_max_int;
			      return std::min(T(x_max_int - i), T(i));
			    }),
			    V([](int i) {
			      i %= x_max_int;
			      return std::max(T(x_max_int - i), T(i));
			    })});
      }
    };

    ADD_TEST(Clamp, std::totally_ordered<T>) {
      std::tuple{test_iota<V>, reverse_iota(test_iota<V>)},
      [](auto& t, const V x, const V y) {
	t.verify_equal(clamp(x, V(), x), x);
	t.verify_equal(clamp(x, x, x), x);
	t.verify_equal(clamp(V(), x, x), x);
	t.verify_equal(clamp(V(), V(), x), V());
	t.verify_equal(clamp(x, V(), V()), V());
	t.verify_equal(clamp(x, V(), y), min(x, y));
	t.verify_equal(clamp(y, V(), x), min(x, y));
	if constexpr (std::is_signed_v<T>)
	  {
	    t.verify_equal(clamp(V(T(-test_iota_max<V>)), -x, x), -x);
	    t.verify_equal(clamp(V(T(test_iota_max<V>)), -x, x), x);
	  }
      }
    };
  };

#include "create_tests.h"