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//====--- OMPGridValues.h - Language-specific address spaces --*- C++ -*-====//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
///
/// \file
/// \brief Provides definitions for Target specific Grid Values
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_OPENMP_GRIDVALUES_H
#define LLVM_OPENMP_GRIDVALUES_H
namespace llvm {
namespace omp {
/// \brief Defines various target-specific GPU grid values that must be
/// consistent between host RTL (plugin), device RTL, and clang.
/// We can change grid values for a "fat" binary so that different
/// passes get the correct values when generating code for a
/// multi-target binary. Both amdgcn and nvptx values are stored in
/// this file. In the future, should there be differences between GPUs
/// of the same architecture, then simply make a different array and
/// use the new array name.
///
/// Example usage in clang:
/// const unsigned slot_size =
/// ctx.GetTargetInfo().getGridValue(llvm::omp::GVIDX::GV_Warp_Size);
///
/// Example usage in libomptarget/deviceRTLs:
/// #include "llvm/Frontend/OpenMP/OMPGridValues.h"
/// #ifdef __AMDGPU__
/// #define GRIDVAL AMDGPUGpuGridValues
/// #else
/// #define GRIDVAL NVPTXGpuGridValues
/// #endif
/// ... Then use this reference for GV_Warp_Size in the deviceRTL source.
/// llvm::omp::GRIDVAL[llvm::omp::GVIDX::GV_Warp_Size]
///
/// Example usage in libomptarget hsa plugin:
/// #include "llvm/Frontend/OpenMP/OMPGridValues.h"
/// #define GRIDVAL AMDGPUGpuGridValues
/// ... Then use this reference to access GV_Warp_Size in the hsa plugin.
/// llvm::omp::GRIDVAL[llvm::omp::GVIDX::GV_Warp_Size]
///
/// Example usage in libomptarget cuda plugin:
/// #include "llvm/Frontend/OpenMP/OMPGridValues.h"
/// #define GRIDVAL NVPTXGpuGridValues
/// ... Then use this reference to access GV_Warp_Size in the cuda plugin.
/// llvm::omp::GRIDVAL[llvm::omp::GVIDX::GV_Warp_Size]
///
enum GVIDX {
/// The maximum number of workers in a kernel.
/// (THREAD_ABSOLUTE_LIMIT) - (GV_Warp_Size), might be issue for blockDim.z
GV_Threads,
/// The size reserved for data in a shared memory slot.
GV_Slot_Size,
/// The default value of maximum number of threads in a worker warp.
GV_Warp_Size,
/// Alternate warp size for some AMDGCN architectures. Same as GV_Warp_Size
/// for NVPTX.
GV_Warp_Size_32,
/// The number of bits required to represent the max number of threads in warp
GV_Warp_Size_Log2,
/// GV_Warp_Size * GV_Slot_Size,
GV_Warp_Slot_Size,
/// the maximum number of teams.
GV_Max_Teams,
/// Global Memory Alignment
GV_Mem_Align,
/// (~0u >> (GV_Warp_Size - GV_Warp_Size_Log2))
GV_Warp_Size_Log2_Mask,
// An alternative to the heavy data sharing infrastructure that uses global
// memory is one that uses device __shared__ memory. The amount of such space
// (in bytes) reserved by the OpenMP runtime is noted here.
GV_SimpleBufferSize,
// The absolute maximum team size for a working group
GV_Max_WG_Size,
// The default maximum team size for a working group
GV_Default_WG_Size,
// This is GV_Max_WG_Size / GV_WarpSize. 32 for NVPTX and 16 for AMDGCN.
GV_Max_Warp_Number,
/// The slot size that should be reserved for a working warp.
/// (~0u >> (GV_Warp_Size - GV_Warp_Size_Log2))
GV_Warp_Size_Log2_MaskL
};
/// For AMDGPU GPUs
static constexpr unsigned AMDGPUGpuGridValues[] = {
448, // GV_Threads
256, // GV_Slot_Size
64, // GV_Warp_Size
32, // GV_Warp_Size_32
6, // GV_Warp_Size_Log2
64 * 256, // GV_Warp_Slot_Size
128, // GV_Max_Teams
256, // GV_Mem_Align
63, // GV_Warp_Size_Log2_Mask
896, // GV_SimpleBufferSize
1024, // GV_Max_WG_Size,
256, // GV_Defaut_WG_Size
1024 / 64, // GV_Max_WG_Size / GV_WarpSize
63 // GV_Warp_Size_Log2_MaskL
};
/// For Nvidia GPUs
static constexpr unsigned NVPTXGpuGridValues[] = {
992, // GV_Threads
256, // GV_Slot_Size
32, // GV_Warp_Size
32, // GV_Warp_Size_32
5, // GV_Warp_Size_Log2
32 * 256, // GV_Warp_Slot_Size
1024, // GV_Max_Teams
256, // GV_Mem_Align
(~0u >> (32 - 5)), // GV_Warp_Size_Log2_Mask
896, // GV_SimpleBufferSize
1024, // GV_Max_WG_Size
128, // GV_Defaut_WG_Size
1024 / 32, // GV_Max_WG_Size / GV_WarpSize
31 // GV_Warp_Size_Log2_MaskL
};
} // namespace omp
} // namespace llvm
#endif // LLVM_OPENMP_GRIDVALUES_H
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