mirror of https://github.com/llvm-mirror/libcxx
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
#ifndef SUPPORT_FP_COMPARE_H
|
|
#define SUPPORT_FP_COMPARE_H
|
|
|
|
#include <cmath> // for std::abs
|
|
#include <algorithm> // for std::max
|
|
#include <cassert>
|
|
|
|
// See https://www.boost.org/doc/libs/1_70_0/libs/test/doc/html/boost_test/testing_tools/extended_comparison/floating_point/floating_points_comparison_theory.html
|
|
|
|
template<typename T>
|
|
bool fptest_close(T val, T expected, T eps)
|
|
{
|
|
constexpr T zero = T(0);
|
|
assert(eps >= zero);
|
|
|
|
// Handle the zero cases
|
|
if (eps == zero) return val == expected;
|
|
if (val == zero) return std::abs(expected) <= eps;
|
|
if (expected == zero) return std::abs(val) <= eps;
|
|
|
|
return std::abs(val - expected) < eps
|
|
&& std::abs(val - expected)/std::abs(val) < eps;
|
|
}
|
|
|
|
template<typename T>
|
|
bool fptest_close_pct(T val, T expected, T percent)
|
|
{
|
|
constexpr T zero = T(0);
|
|
assert(percent >= zero);
|
|
|
|
// Handle the zero cases
|
|
if (percent == zero) return val == expected;
|
|
T eps = (percent / T(100)) * std::max(std::abs(val), std::abs(expected));
|
|
|
|
return fptest_close(val, expected, eps);
|
|
}
|
|
|
|
|
|
#endif // SUPPORT_FP_COMPARE_H
|