mirror of git://gcc.gnu.org/git/gcc.git
48 lines
1.5 KiB
C++
48 lines
1.5 KiB
C++
// { dg-do run { target c++11 } }
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// { dg-options "-D__STDCPP_WANT_MATH_SPEC_FUNCS__" }
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// Copyright (C) 2017-2019 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING3. If not see
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// <http://www.gnu.org/licenses/>.
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// PR libstdc++/68397 - std::tr1::expint fails in __expint_En_cont_frac
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// for some long double arguments due to low __max_iter value
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#include <cmath>
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#include <testsuite_hooks.h>
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void
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test01()
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{
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// Answers from Wolfram Alpha.
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long double ans_ok = -0.10001943365331651406888645149537315243646135979573L;
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long double ans_bomb = -0.10777727809650077516264612749163100483995270163783L;
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auto Ei_ok = std::expint(-1.500001L);
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auto diff_ok = Ei_ok - ans_ok;
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VERIFY(std::abs(diff_ok) < 1.0e-15);
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auto Ei_bomb = std::expint(-1.450001L);
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auto diff_bomb = Ei_bomb - ans_bomb;
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VERIFY(std::abs(diff_bomb) < 1.0e-15);
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}
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int
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main()
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{
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test01();
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return 0;
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}
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