libstdc++-v3/testsuite/experimental/simd/tests/remqo.cc

// Copyright (C) 2020-2021 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3.  If not see
// <http://www.gnu.org/licenses/>.

// only: float|double|ldouble * * *
// expensive: * [1-9] * *
#include "bits/verify.h"
#include "bits/metahelpers.h"
#include "bits/test_values.h"

template <typename V>
  void
  test()
  {
    vir::test::setFuzzyness<float>(0);
    vir::test::setFuzzyness<double>(0);

    using T = typename V::value_type;
    test_values_2arg<V>(
      {
#ifdef __STDC_IEC_559__
	std::__quiet_NaN_v<T>, std::__infinity_v<T>, -std::__infinity_v<T>,
	std::__denorm_min_v<T>, std::__norm_min_v<T> / 3, -0.,
#endif
	+0., std::__norm_min_v<T>, std::__finite_max_v<T>},
      {10000}, [](V a, V b) {

#ifndef __STDC_IEC_559__
	// without __STDC_IEC_559__, remquo(a, 0) is unspecified
	where(b == 0, b) = 1;
#endif
	using IV = std::experimental::fixed_size_simd<int, V::size()>;
	IV quo = {};
	const V totest = remquo(a, b, &quo);
	auto&& expected
	  = [&](const auto& v, const auto& w) -> std::pair<const V, const IV> {
	    std::pair<V, IV> tmp = {};
	    using std::remquo;
	    for (std::size_t i = 0; i < V::size(); ++i)
	      {
		int tmp2;
		tmp.first[i] = remquo(v[i], w[i], &tmp2);
		tmp.second[i] = tmp2;
	      }
	    return tmp;
	  };
	const auto expect1 = expected(a, b);
	COMPARE(isnan(totest), isnan(expect1.first))
	  << "remquo(" << a << ", " << b << ", quo) = " << totest
	  << " != " << expect1.first;
	const V clean_a = iif(isnan(totest), 0, a);
	const V clean_b = iif(isnan(totest), 1, b);
	const auto expect2 = expected(clean_a, clean_b);
	COMPARE(remquo(clean_a, clean_b, &quo), expect2.first)
	  << "\nclean_a/b = " << clean_a << ", " << clean_b;
	COMPARE(quo, expect2.second);
      });
  }