93 lines
3.3 KiB
C++
93 lines
3.3 KiB
C++
/***************************************************************************************************
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* Copyright (c) 2023 - 2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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**************************************************************************************************/
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#pragma once
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#include <cute/config.hpp>
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#include <cute/numeric/integral_constant.hpp>
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#include <cuda_runtime.h>
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namespace cutlass::fmha {
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struct Pow2 {
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int n;
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int log2_n;
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explicit CUTE_DEVICE Pow2(int n) : n(n) {
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#ifdef __CUDA_ARCH__
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log2_n = __ffs(n) - 1;
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#endif
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}
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template<class T>
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CUTE_HOST_DEVICE T operator *(T const& b) const {
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return n * b;
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}
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template<int N>
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CUTE_HOST_DEVICE auto operator *(Int<N> const&) const {
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if constexpr (N & (N - 1) == 0) {
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return Pow2{n * N};
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}
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return n * N;
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}
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};
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template<class T>
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CUTE_HOST_DEVICE auto operator/(T const& a, Pow2 const& b) {
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return a >> b.log2_n;
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}
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template<class T>
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CUTE_HOST_DEVICE auto operator%(T const& a, Pow2 const& b) {
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return a & (b.n - 1);
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}
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template<class T>
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CUTE_HOST_DEVICE bool operator<(T const& a, Pow2 const& b) {
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return a < b.n;
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}
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CUTE_HOST_DEVICE void print(Pow2 const& a) {
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printf("2^%d", a.log2_n);
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}
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} // end namespace cutlass::fmha
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namespace cute {
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template <>
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struct is_integral<cutlass::fmha::Pow2> : true_type {};
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} // end namespace cute
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