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