30 lines
854 B
C++
30 lines
854 B
C++
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// Jolt Physics Library (https://github.com/jrouwe/JoltPhysics)
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// SPDX-FileCopyrightText: 2023 Jorrit Rouwe
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// SPDX-License-Identifier: MIT
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#include "UnitTestFramework.h"
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#include <atomic>
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// Implemented as a global atomic so the compiler can't optimize it to a constant
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extern atomic<float> One, OneTenth, Ten;
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atomic<float> One = 1.0f, OneTenth = 0.1f /* Actually: 0.100000001f */, Ten = 10.0f;
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JPH_PRECISE_MATH_ON
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TEST_SUITE("PreciseMathTest")
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{
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TEST_CASE("CheckNoFMA")
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{
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// Should not use the FMA instruction and end up being zero
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// If FMA is active, a * b will not be rounded to 1.0f so the result will be a small positive number
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float a = OneTenth, b = Ten, c = One;
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float result = a * b - c;
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CHECK(result == 0.0f);
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// Compiler should not optimize these variables away
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One = OneTenth = Ten = 2.0f;
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}
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}
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JPH_PRECISE_MATH_OFF
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