forked from OSchip/llvm-project
136 lines
3.7 KiB
C++
136 lines
3.7 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <complex>
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// template<class T>
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// T
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// arg(const complex<T>& x);
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#include <complex>
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#include <cassert>
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#include "../cases.h"
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template <class T>
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void
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test()
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{
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std::complex<T> z(1, 0);
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assert(arg(z) == 0);
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}
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void test_edges()
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{
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const double pi = std::atan2(+0., -0.);
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const unsigned N = sizeof(x) / sizeof(x[0]);
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for (unsigned i = 0; i < N; ++i)
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{
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double r = arg(x[i]);
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if (std::isnan(x[i].real()) || std::isnan(x[i].imag()))
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assert(std::isnan(r));
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else
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{
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switch (classify(x[i]))
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{
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case zero:
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if (std::signbit(x[i].real()))
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{
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if (std::signbit(x[i].imag()))
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is_about(r, -pi);
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else
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is_about(r, pi);
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}
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else
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{
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assert(std::signbit(x[i].imag()) == std::signbit(r));
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}
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break;
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case non_zero:
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if (x[i].real() == 0)
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{
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if (x[i].imag() < 0)
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is_about(r, -pi/2);
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else
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is_about(r, pi/2);
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}
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else if (x[i].imag() == 0)
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{
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if (x[i].real() < 0)
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{
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if (std::signbit(x[i].imag()))
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is_about(r, -pi);
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else
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is_about(r, pi);
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}
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else
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{
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assert(r == 0);
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assert(std::signbit(x[i].imag()) == std::signbit(r));
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}
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}
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else if (x[i].imag() > 0)
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assert(r > 0);
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else
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assert(r < 0);
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break;
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case inf:
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if (std::isinf(x[i].real()) && std::isinf(x[i].imag()))
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{
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if (x[i].real() < 0)
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{
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if (x[i].imag() > 0)
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is_about(r, 0.75 * pi);
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else
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is_about(r, -0.75 * pi);
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}
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else
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{
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if (x[i].imag() > 0)
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is_about(r, 0.25 * pi);
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else
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is_about(r, -0.25 * pi);
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}
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}
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else if (std::isinf(x[i].real()))
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{
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if (x[i].real() < 0)
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{
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if (std::signbit(x[i].imag()))
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is_about(r, -pi);
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else
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is_about(r, pi);
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}
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else
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{
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assert(r == 0);
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assert(std::signbit(r) == std::signbit(x[i].imag()));
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}
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}
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else
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{
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if (x[i].imag() < 0)
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is_about(r, -pi/2);
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else
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is_about(r, pi/2);
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}
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break;
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}
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}
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}
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}
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int main()
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{
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test<float>();
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test<double>();
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test<long double>();
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test_edges();
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}
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