0e20cae1a5
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@111762 91177308-0d34-0410-b5e6-96231b3b80d8
136 lines
3.7 KiB
C++
136 lines
3.7 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// <complex>
|
|
|
|
// template<class T>
|
|
// T
|
|
// arg(const complex<T>& x);
|
|
|
|
#include <complex>
|
|
#include <cassert>
|
|
|
|
#include "../cases.h"
|
|
|
|
template <class T>
|
|
void
|
|
test()
|
|
{
|
|
std::complex<T> z(1, 0);
|
|
assert(arg(z) == 0);
|
|
}
|
|
|
|
void test_edges()
|
|
{
|
|
const double pi = std::atan2(+0., -0.);
|
|
const unsigned N = sizeof(x) / sizeof(x[0]);
|
|
for (unsigned i = 0; i < N; ++i)
|
|
{
|
|
double r = arg(x[i]);
|
|
if (std::isnan(x[i].real()) || std::isnan(x[i].imag()))
|
|
assert(std::isnan(r));
|
|
else
|
|
{
|
|
switch (classify(x[i]))
|
|
{
|
|
case zero:
|
|
if (std::signbit(x[i].real()))
|
|
{
|
|
if (std::signbit(x[i].imag()))
|
|
is_about(r, -pi);
|
|
else
|
|
is_about(r, pi);
|
|
}
|
|
else
|
|
{
|
|
assert(std::signbit(x[i].imag()) == std::signbit(r));
|
|
}
|
|
break;
|
|
case non_zero:
|
|
if (x[i].real() == 0)
|
|
{
|
|
if (x[i].imag() < 0)
|
|
is_about(r, -pi/2);
|
|
else
|
|
is_about(r, pi/2);
|
|
}
|
|
else if (x[i].imag() == 0)
|
|
{
|
|
if (x[i].real() < 0)
|
|
{
|
|
if (std::signbit(x[i].imag()))
|
|
is_about(r, -pi);
|
|
else
|
|
is_about(r, pi);
|
|
}
|
|
else
|
|
{
|
|
assert(r == 0);
|
|
assert(std::signbit(x[i].imag()) == std::signbit(r));
|
|
}
|
|
}
|
|
else if (x[i].imag() > 0)
|
|
assert(r > 0);
|
|
else
|
|
assert(r < 0);
|
|
break;
|
|
case inf:
|
|
if (std::isinf(x[i].real()) && std::isinf(x[i].imag()))
|
|
{
|
|
if (x[i].real() < 0)
|
|
{
|
|
if (x[i].imag() > 0)
|
|
is_about(r, 0.75 * pi);
|
|
else
|
|
is_about(r, -0.75 * pi);
|
|
}
|
|
else
|
|
{
|
|
if (x[i].imag() > 0)
|
|
is_about(r, 0.25 * pi);
|
|
else
|
|
is_about(r, -0.25 * pi);
|
|
}
|
|
}
|
|
else if (std::isinf(x[i].real()))
|
|
{
|
|
if (x[i].real() < 0)
|
|
{
|
|
if (std::signbit(x[i].imag()))
|
|
is_about(r, -pi);
|
|
else
|
|
is_about(r, pi);
|
|
}
|
|
else
|
|
{
|
|
assert(r == 0);
|
|
assert(std::signbit(r) == std::signbit(x[i].imag()));
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (x[i].imag() < 0)
|
|
is_about(r, -pi/2);
|
|
else
|
|
is_about(r, pi/2);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
int main()
|
|
{
|
|
test<float>();
|
|
test<double>();
|
|
test<long double>();
|
|
test_edges();
|
|
}
|