1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
|
//===------- Mapping.cpp - OpenMP device runtime mapping helpers -- 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
//
//===----------------------------------------------------------------------===//
//
//
//===----------------------------------------------------------------------===//
#include "Mapping.h"
#include "DeviceTypes.h"
#include "DeviceUtils.h"
#include "Interface.h"
#include "State.h"
#include "gpuintrin.h"
using namespace ompx;
// FIXME: This resolves the handling for the AMDGPU workgroup size when the ABI
// is set to 'none'. We only support COV5+ but this can be removed when COV4 is
// fully deprecated.
#ifdef __AMDGPU__
extern const inline uint32_t __oclc_ABI_version = 500;
[[gnu::alias("__oclc_ABI_version")]] const uint32_t __oclc_ABI_version__;
#endif
static bool isInLastWarp() {
uint32_t MainTId = (mapping::getNumberOfThreadsInBlock() - 1) &
~(mapping::getWarpSize() - 1);
return mapping::getThreadIdInBlock() == MainTId;
}
bool mapping::isMainThreadInGenericMode(bool IsSPMD) {
if (IsSPMD || icv::Level)
return false;
// Check if this is the last warp in the block.
return isInLastWarp();
}
bool mapping::isMainThreadInGenericMode() {
return mapping::isMainThreadInGenericMode(mapping::isSPMDMode());
}
bool mapping::isInitialThreadInLevel0(bool IsSPMD) {
if (IsSPMD)
return mapping::getThreadIdInBlock() == 0;
return isInLastWarp();
}
bool mapping::isLeaderInWarp() {
__kmpc_impl_lanemask_t Active = mapping::activemask();
__kmpc_impl_lanemask_t LaneMaskLT = mapping::lanemaskLT();
return utils::popc(Active & LaneMaskLT) == 0;
}
LaneMaskTy mapping::activemask() { return __gpu_lane_mask(); }
LaneMaskTy mapping::lanemaskLT() {
#ifdef __NVPTX__
return __nvvm_read_ptx_sreg_lanemask_lt();
#else
uint32_t Lane = mapping::getThreadIdInWarp();
int64_t Ballot = mapping::activemask();
uint64_t Mask = ((uint64_t)1 << Lane) - (uint64_t)1;
return Mask & Ballot;
#endif
}
LaneMaskTy mapping::lanemaskGT() {
#ifdef __NVPTX__
return __nvvm_read_ptx_sreg_lanemask_gt();
#else
uint32_t Lane = mapping::getThreadIdInWarp();
if (Lane == (mapping::getWarpSize() - 1))
return 0;
int64_t Ballot = mapping::activemask();
uint64_t Mask = (~((uint64_t)0)) << (Lane + 1);
return Mask & Ballot;
#endif
}
uint32_t mapping::getThreadIdInWarp() {
uint32_t ThreadIdInWarp = __gpu_lane_id();
ASSERT(ThreadIdInWarp < mapping::getWarpSize(), nullptr);
return ThreadIdInWarp;
}
uint32_t mapping::getThreadIdInBlock(int32_t Dim) {
uint32_t ThreadIdInBlock = __gpu_thread_id(Dim);
return ThreadIdInBlock;
}
uint32_t mapping::getWarpSize() { return __gpu_num_lanes(); }
uint32_t mapping::getMaxTeamThreads(bool IsSPMD) {
uint32_t BlockSize = mapping::getNumberOfThreadsInBlock();
// If we are in SPMD mode, remove one warp.
return BlockSize - (!IsSPMD * mapping::getWarpSize());
}
uint32_t mapping::getMaxTeamThreads() {
return mapping::getMaxTeamThreads(mapping::isSPMDMode());
}
uint32_t mapping::getNumberOfThreadsInBlock(int32_t Dim) {
return __gpu_num_threads(Dim);
}
uint32_t mapping::getNumberOfThreadsInKernel() {
return mapping::getNumberOfThreadsInBlock(0) *
mapping::getNumberOfBlocksInKernel(0) *
mapping::getNumberOfThreadsInBlock(1) *
mapping::getNumberOfBlocksInKernel(1) *
mapping::getNumberOfThreadsInBlock(2) *
mapping::getNumberOfBlocksInKernel(2);
}
uint32_t mapping::getWarpIdInBlock() {
uint32_t WarpID =
mapping::getThreadIdInBlock(mapping::DIM_X) / mapping::getWarpSize();
ASSERT(WarpID < mapping::getNumberOfWarpsInBlock(), nullptr);
return WarpID;
}
uint32_t mapping::getBlockIdInKernel(int32_t Dim) {
uint32_t BlockId = __gpu_block_id(Dim);
ASSERT(BlockId < mapping::getNumberOfBlocksInKernel(Dim), nullptr);
return BlockId;
}
uint32_t mapping::getNumberOfWarpsInBlock() {
return (mapping::getNumberOfThreadsInBlock() + mapping::getWarpSize() - 1) /
mapping::getWarpSize();
}
uint32_t mapping::getNumberOfBlocksInKernel(int32_t Dim) {
return __gpu_num_blocks(Dim);
}
uint32_t mapping::getNumberOfProcessorElements() {
return static_cast<uint32_t>(config::getHardwareParallelism());
}
///}
/// Execution mode
///
///{
// TODO: This is a workaround for initialization coming from kernels outside of
// the TU. We will need to solve this more correctly in the future.
[[gnu::weak, clang::loader_uninitialized]] Local<int> IsSPMDMode;
void mapping::init(bool IsSPMD) {
if (mapping::isInitialThreadInLevel0(IsSPMD))
IsSPMDMode = IsSPMD;
}
bool mapping::isSPMDMode() { return IsSPMDMode; }
bool mapping::isGenericMode() { return !isSPMDMode(); }
///}
extern "C" {
[[gnu::noinline]] uint32_t __kmpc_get_hardware_thread_id_in_block() {
return mapping::getThreadIdInBlock();
}
[[gnu::noinline]] uint32_t __kmpc_get_hardware_num_threads_in_block() {
return mapping::getNumberOfThreadsInBlock(mapping::DIM_X);
}
[[gnu::noinline]] uint32_t __kmpc_get_warp_size() {
return mapping::getWarpSize();
}
}
#define _TGT_KERNEL_LANGUAGE(NAME, MAPPER_NAME) \
extern "C" int ompx_##NAME(int Dim) { return mapping::MAPPER_NAME(Dim); }
_TGT_KERNEL_LANGUAGE(thread_id, getThreadIdInBlock)
_TGT_KERNEL_LANGUAGE(block_id, getBlockIdInKernel)
_TGT_KERNEL_LANGUAGE(block_dim, getNumberOfThreadsInBlock)
_TGT_KERNEL_LANGUAGE(grid_dim, getNumberOfBlocksInKernel)
extern "C" {
uint64_t ompx_ballot_sync(uint64_t mask, int pred) {
return utils::ballotSync(mask, pred);
}
int ompx_shfl_down_sync_i(uint64_t mask, int var, unsigned delta, int width) {
return utils::shuffleDown(mask, var, delta, width);
}
float ompx_shfl_down_sync_f(uint64_t mask, float var, unsigned delta,
int width) {
return utils::bitCast<float>(
utils::shuffleDown(mask, utils::bitCast<int32_t>(var), delta, width));
}
long ompx_shfl_down_sync_l(uint64_t mask, long var, unsigned delta, int width) {
return utils::shuffleDown(mask, utils::bitCast<int64_t>(var), delta, width);
}
double ompx_shfl_down_sync_d(uint64_t mask, double var, unsigned delta,
int width) {
return utils::bitCast<double>(
utils::shuffleDown(mask, utils::bitCast<int64_t>(var), delta, width));
}
}
|
