derek.holloway
7502bf64a4
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84 lines
2.7 KiB
C++
84 lines
2.7 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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// SPDX-FileCopyrightText: Copyright (c) 2024 NVIDIA CORPORATION & AFFILIATES.
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//
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//===----------------------------------------------------------------------===//
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// <cmath>
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// constexpr float lerp(float a, float b, float t) noexcept;
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// constexpr double lerp(double a, double b, double t) noexcept;
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// constexpr long double lerp(long double a, long double b, long double t) noexcept;
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#include <cuda/std/cassert>
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#include <cuda/std/cmath>
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#include <cuda/std/limits>
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#include <cuda/std/type_traits>
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#include "fp_compare.h"
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#include "test_macros.h"
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template <typename T>
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__host__ __device__ constexpr bool constexpr_test()
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{
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return cuda::std::lerp(T(0.0), T(12), T(0.0)) == T(0.0) && cuda::std::lerp(T(12), T(0.0), T(0.5)) == T(6)
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&& cuda::std::lerp(T(0.0), T(12), T(2)) == T(24);
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}
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template <typename T>
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__host__ __device__ void test()
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{
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static_assert(cuda::std::is_same_v<T, decltype(cuda::std::lerp(T(), T(), T()))>);
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static_assert(noexcept(cuda::std::lerp(T(), T(), T())), "");
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const T maxV = cuda::std::numeric_limits<T>::max();
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const T inf = cuda::std::numeric_limits<T>::infinity();
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// Things that can be compared exactly
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assert((cuda::std::lerp(T(0.0), T(12), T(0.0)) == T(0.0)));
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assert((cuda::std::lerp(T(0.0), T(12), T(1)) == T(12)));
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assert((cuda::std::lerp(T(12), T(0.0), T(0.0)) == T(12)));
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assert((cuda::std::lerp(T(12), T(0.0), T(1)) == T(0.0)));
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assert((cuda::std::lerp(T(0.0), T(12), T(0.5)) == T(6)));
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assert((cuda::std::lerp(T(12), T(0.0), T(0.5)) == T(6)));
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assert((cuda::std::lerp(T(0.0), T(12), T(2)) == T(24)));
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assert((cuda::std::lerp(T(12), T(0.0), T(2)) == T(-12)));
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assert((cuda::std::lerp(maxV, maxV / T(10), T(0.0)) == maxV));
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assert((cuda::std::lerp(maxV / T(10), maxV, T(1)) == maxV));
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assert((cuda::std::lerp(T(2.3), T(2.3), inf) == T(2.3)));
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assert(cuda::std::lerp(T(0.0), T(0.0), T(23)) == T(0.0));
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// __half and __nvbfloat have precision issues here
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if constexpr (!cuda::std::__is_extended_floating_point_v<T>)
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{
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assert(cuda::std::isnan(cuda::std::lerp(T(0.0), T(0.0), T(inf))));
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}
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}
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int main(int, char**)
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{
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test<float>();
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test<double>();
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#if _CCCL_HAS_LONG_DOUBLE()
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test<long double>();
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#endif // _CCCL_HAS_LONG_DOUBLE()
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#if _LIBCUDACXX_HAS_NVFP16()
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test<__half>();
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#endif // _LIBCUDACXX_HAS_NVFP16()
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#if _LIBCUDACXX_HAS_NVBF16()
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test<__nv_bfloat16>();
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#endif // _LIBCUDACXX_HAS_NVBF16()
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static_assert(constexpr_test<float>(), "");
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static_assert(constexpr_test<double>(), "");
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return 0;
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}
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