47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef SUPPORT_FP_COMPARE_H
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#define SUPPORT_FP_COMPARE_H
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#include <cmath> // for std::abs
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#include <algorithm> // for std::max
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#include <cassert>
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// 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
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template<typename T>
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bool fptest_close(T val, T expected, T eps)
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{
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constexpr T zero = T(0);
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assert(eps >= zero);
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// Handle the zero cases
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if (eps == zero) return val == expected;
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if (val == zero) return std::abs(expected) <= eps;
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if (expected == zero) return std::abs(val) <= eps;
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return std::abs(val - expected) < eps
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&& std::abs(val - expected)/std::abs(val) < eps;
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}
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template<typename T>
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bool fptest_close_pct(T val, T expected, T percent)
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{
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constexpr T zero = T(0);
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assert(percent >= zero);
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// Handle the zero cases
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if (percent == zero) return val == expected;
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T eps = (percent / T(100)) * std::max(std::abs(val), std::abs(expected));
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return fptest_close(val, expected, eps);
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}
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#endif // SUPPORT_FP_COMPARE_H
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