CUTLASS 3.0.0
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thakkarv
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include/cute/numeric/integer_subbyte.hpp
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include/cute/numeric/integer_subbyte.hpp
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/***************************************************************************************************
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* Copyright (c) 2023 - 2023 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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#if defined(__CUDACC_RTC__)
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#include <cuda/std/cstdint>
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#else
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#include <cstdint>
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#endif
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#include <cute/config.hpp>
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#include <cute/util/type_traits.hpp>
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namespace cute {
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///////////////////////////////////////////////////////////////////////////////////////////////////
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template <int Bits, bool Signed = true>
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struct integer_subbyte
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{
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/// Storage type
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using Storage = uint8_t;
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/// Number of bits
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static_assert(Bits <= 8*sizeof(Storage), "Require a subbyte of bits in integer_subbyte");
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/// External type
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using xint_t = typename std::conditional<Signed, int, unsigned>::type;
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/// Bitmask for truncation from larger integers
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static constexpr Storage bits_mask_ = Storage((1 << Bits) - 1);
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/// Bitmask for the sign bit
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static constexpr Storage sign_mask_ = Storage((Signed ? 1 : 0) << (Bits - 1));
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//
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// Data members
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//
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Storage storage;
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//
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// Methods
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//
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/// No operation
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CUTE_HOST_DEVICE constexpr
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integer_subbyte() {}
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/// Conversion from integer type
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CUTE_HOST_DEVICE constexpr
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integer_subbyte(int value) // NOTE: Sign extension?
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: storage(reinterpret_cast<Storage const&>(value) & bits_mask_) {}
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CUTE_HOST_DEVICE constexpr
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integer_subbyte(unsigned value)
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: storage(reinterpret_cast<Storage const&>(value) & bits_mask_) {}
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/// Convert to int or unsigned
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CUTE_HOST_DEVICE constexpr
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operator xint_t() const {
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if (sign_mask_ & storage) { // Sign extend
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return xint_t(storage) | ~xint_t(bits_mask_);
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} else {
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return xint_t(storage);
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}
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}
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/// Equality
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CUTE_HOST_DEVICE constexpr
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bool operator==(integer_subbyte const& rhs) const {
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return storage == rhs.storage;
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}
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/// Inequality
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CUTE_HOST_DEVICE constexpr
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bool operator!=(integer_subbyte const& rhs) const {
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return storage != rhs.storage;
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}
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/// Less than or equal
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CUTE_HOST_DEVICE constexpr
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bool operator<=(integer_subbyte const& rhs) const {
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if (sign_mask_ & storage) {
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return !(rhs.storage < storage);
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} else {
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return storage < rhs.storage;
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}
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}
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/// Less than
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CUTE_HOST_DEVICE constexpr
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bool operator<(integer_subbyte const& rhs) const {
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if (sign_mask_ & storage) {
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return !(rhs.storage <= storage);
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} else {
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return storage < rhs.storage;
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}
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}
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/// Greater than or equal
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CUTE_HOST_DEVICE constexpr
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bool operator>=(integer_subbyte const& rhs) const {
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return !(*this < rhs);
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}
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/// Greater than
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CUTE_HOST_DEVICE constexpr
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bool operator>(integer_subbyte const& rhs) const {
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return !(*this <= rhs);
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}
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};
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///////////////////////////////////////////////////////////////////////////////////////////////////
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/// 1-bit unsigned integer type
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using uint1b_t = integer_subbyte<1, false>;
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/// 2-bit integer type
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using int2b_t = integer_subbyte<2, true>;
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/// 2-bit unsigned integer type
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using uint2b_t = integer_subbyte<2, false>;
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/// 4-bit integer type
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using int4b_t = integer_subbyte<4, true>;
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/// 4-bit unsigned integer type
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using uint4b_t = integer_subbyte<4, false>;
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/// 1-bit binary type
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using bin1_t = bool;
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} // namespace cute
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///////////////////////////////////////////////////////////////////////////////////////////////////
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#if !defined(__CUDACC_RTC__)
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#include <limits>
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namespace std {
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template <>
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struct numeric_limits<cute::uint1b_t> {
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CUTE_HOST_DEVICE static constexpr
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cute::uint1b_t const lowest() noexcept { return 0; }
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CUTE_HOST_DEVICE static constexpr
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cute::uint1b_t const min() noexcept { return 0; }
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CUTE_HOST_DEVICE static constexpr
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cute::uint1b_t const max() noexcept { return 1; }
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static constexpr bool is_integer = true;
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static constexpr bool is_signed = false;
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};
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template <>
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struct numeric_limits<cute::int2b_t> {
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CUTE_HOST_DEVICE static constexpr
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cute::int2b_t lowest() noexcept { return -2; }
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CUTE_HOST_DEVICE static constexpr
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cute::int2b_t min() noexcept { return -2; }
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CUTE_HOST_DEVICE static constexpr
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cute::int2b_t max() noexcept { return 1; }
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static constexpr bool is_integer = true;
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static constexpr bool is_signed = true;
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};
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template <>
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struct numeric_limits<cute::uint2b_t> {
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CUTE_HOST_DEVICE static constexpr
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cute::uint2b_t const lowest() noexcept { return 0; }
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CUTE_HOST_DEVICE static constexpr
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cute::uint2b_t const min() noexcept { return 0; }
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CUTE_HOST_DEVICE static constexpr
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cute::uint2b_t const max() noexcept { return 3; }
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static constexpr bool is_integer = true;
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static constexpr bool is_signed = false;
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};
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template <>
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struct numeric_limits<cute::int4b_t> {
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CUTE_HOST_DEVICE static constexpr
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cute::int4b_t lowest() noexcept { return -8; }
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CUTE_HOST_DEVICE static constexpr
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cute::int4b_t min() noexcept { return -8; }
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CUTE_HOST_DEVICE static constexpr
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cute::int4b_t max() noexcept { return 7; }
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static constexpr bool is_integer = true;
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static constexpr bool is_signed = true;
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};
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template <>
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struct numeric_limits<cute::uint4b_t> {
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CUTE_HOST_DEVICE static constexpr
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cute::uint4b_t const lowest() noexcept { return 0; }
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CUTE_HOST_DEVICE static constexpr
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cute::uint4b_t const min() noexcept { return 0; }
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CUTE_HOST_DEVICE static constexpr
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cute::uint4b_t const max() noexcept { return 15; }
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static constexpr bool is_integer = true;
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static constexpr bool is_signed = false;
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};
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} // namespace std
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#endif
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