CUTLASS 2.0 (#62)
CUTLASS 2.0 Substantially refactored for - Better performance, particularly for native Turing Tensor Cores - Robust and durable templates spanning the design space - Encapsulated functionality embodying modern C++11 programming techniques - Optimized containers and data types for efficient, generic, portable device code Updates to: - Quick start guide - Documentation - Utilities - CUTLASS Profiler Native Turing Tensor Cores - Efficient GEMM kernels targeting Turing Tensor Cores - Mixed-precision floating point, 8-bit integer, 4-bit integer, and binarized operands Coverage of existing CUTLASS functionality: - GEMM kernels targeting CUDA and Tensor Cores in NVIDIA GPUs - Volta Tensor Cores through native mma.sync and through WMMA API - Optimizations such as parallel reductions, threadblock rasterization, and intra-threadblock reductions - Batched GEMM operations - Complex-valued GEMMs Note: this commit and all that follow require a host compiler supporting C++11 or greater.
This commit is contained in:
Andrew Kerr
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include/cutlass/integer_subbyte.h
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182
include/cutlass/integer_subbyte.h
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/***************************************************************************************************
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* Copyright (c) 2019, NVIDIA CORPORATION. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification, are permitted
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* provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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* * Neither the name of the NVIDIA CORPORATION nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NVIDIA CORPORATION BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TOR (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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/*!
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\file
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\brief Defines a class for using integer types smaller than one byte in host or
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device code.
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*/
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#pragma once
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#include <cstdint>
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#include "cutlass/platform/platform.h"
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namespace cutlass {
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///////////////////////////////////////////////////////////////////////////////////////////////////
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/// 4-bit signed integer type
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template <int Bits, bool Signed = true>
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struct integer_subbyte {
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/// Number of bits
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static int const kBits = Bits;
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/// Whether type is signed
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static bool const kSigned = Signed;
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/// External type
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using T = typename std::conditional<kSigned, int, unsigned>::type;
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/// Storage type
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using Storage = uint8_t;
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/// Bitmask used to truncate from larger integers
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static Storage const kMask = Storage((1 << kBits) - 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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CUTLASS_HOST_DEVICE
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integer_subbyte() { }
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/// Conversion from integer type
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CUTLASS_HOST_DEVICE
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integer_subbyte(int value)
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: storage(reinterpret_cast<Storage const &>(value) & kMask) {}
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CUTLASS_HOST_DEVICE
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integer_subbyte(unsigned value)
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: storage(reinterpret_cast<Storage const &>(value) & kMask) {}
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/// Conversion from double
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CUTLASS_HOST_DEVICE
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integer_subbyte(double value) {
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T tmp = (T)value;
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storage = reinterpret_cast<Storage const &>(tmp) & kMask;
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}
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///
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CUTLASS_HOST_DEVICE
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operator T() const {
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if (kSigned) {
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// Sign extend
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if (storage & Storage(1 << (kBits - 1))) {
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return T(storage) | ~T(kMask);
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}
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}
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return T(storage);
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}
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/// Equality
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CUTLASS_HOST_DEVICE
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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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CUTLASS_HOST_DEVICE
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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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CUTLASS_HOST_DEVICE
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bool operator<=(integer_subbyte const &rhs) const {
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if (kSigned) {
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if (storage & (1 << (kBits - 1))) {
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return !(rhs.storage < storage);
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}
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}
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return storage < rhs.storage;
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}
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/// Less than
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CUTLASS_HOST_DEVICE
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bool operator<(integer_subbyte const &rhs) const {
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if (kSigned) {
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if (storage & (1 << (kBits - 1))) {
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return !(rhs.storage <= storage);
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}
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}
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return storage < rhs.storage;
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}
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/// Greater than or equal
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CUTLASS_HOST_DEVICE
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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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CUTLASS_HOST_DEVICE
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bool operator>(integer_subbyte const &rhs) const {
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return !(rhs < *this);
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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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/// 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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///////////////////////////////////////////////////////////////////////////////////////////////////
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/// Defines the size of an element in bits - specialized for uint1b_t
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template <>
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struct sizeof_bits<uint1b_t> {
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static int const value = 1;
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};
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/// Defines the size of an element in bits - specialized for int4b_t
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template <>
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struct sizeof_bits<int4b_t> {
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static int const value = 4;
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};
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/// Defines the size of an element in bits - specialized for uint4b_t
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template <>
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struct sizeof_bits<uint4b_t> {
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static int const value = 4;
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};
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///////////////////////////////////////////////////////////////////////////////////////////////////
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} // namespace cutlass
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