summaryrefslogtreecommitdiff
path: root/thirdparty/glslang/SPIRV/SpvPostProcess.cpp
blob: d40174d17211059f7d24da3e920a2becd8cfc1cf (plain)
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
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
//
// Copyright (C) 2018 Google, Inc.
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
//    Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
//
//    Redistributions in binary form must reproduce the above
//    copyright notice, this list of conditions and the following
//    disclaimer in the documentation and/or other materials provided
//    with the distribution.
//
//    Neither the name of 3Dlabs Inc. Ltd. nor the names of its
//    contributors may be used to endorse or promote products derived
//    from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.

//
// Post-processing for SPIR-V IR, in internal form, not standard binary form.
//

#include <cassert>
#include <cstdlib>

#include <unordered_map>
#include <unordered_set>
#include <algorithm>

#include "SpvBuilder.h"

#include "spirv.hpp"
#include "GlslangToSpv.h"
#include "SpvBuilder.h"
namespace spv {
    #include "GLSL.std.450.h"
    #include "GLSL.ext.KHR.h"
    #include "GLSL.ext.EXT.h"
    #include "GLSL.ext.AMD.h"
    #include "GLSL.ext.NV.h"
}

namespace spv {

#ifndef GLSLANG_WEB
// Hook to visit each operand type and result type of an instruction.
// Will be called multiple times for one instruction, once for each typed
// operand and the result.
void Builder::postProcessType(const Instruction& inst, Id typeId)
{
    // Characterize the type being questioned
    Id basicTypeOp = getMostBasicTypeClass(typeId);
    int width = 0;
    if (basicTypeOp == OpTypeFloat || basicTypeOp == OpTypeInt)
        width = getScalarTypeWidth(typeId);

    // Do opcode-specific checks
    switch (inst.getOpCode()) {
    case OpLoad:
    case OpStore:
        if (basicTypeOp == OpTypeStruct) {
            if (containsType(typeId, OpTypeInt, 8))
                addCapability(CapabilityInt8);
            if (containsType(typeId, OpTypeInt, 16))
                addCapability(CapabilityInt16);
            if (containsType(typeId, OpTypeFloat, 16))
                addCapability(CapabilityFloat16);
        } else {
            StorageClass storageClass = getStorageClass(inst.getIdOperand(0));
            if (width == 8) {
                switch (storageClass) {
                case StorageClassPhysicalStorageBufferEXT:
                case StorageClassUniform:
                case StorageClassStorageBuffer:
                case StorageClassPushConstant:
                    break;
                default:
                    addCapability(CapabilityInt8);
                    break;
                }
            } else if (width == 16) {
                switch (storageClass) {
                case StorageClassPhysicalStorageBufferEXT:
                case StorageClassUniform:
                case StorageClassStorageBuffer:
                case StorageClassPushConstant:
                case StorageClassInput:
                case StorageClassOutput:
                    break;
                default:
                    if (basicTypeOp == OpTypeInt)
                        addCapability(CapabilityInt16);
                    if (basicTypeOp == OpTypeFloat)
                        addCapability(CapabilityFloat16);
                    break;
                }
            }
        }
        break;
    case OpAccessChain:
    case OpPtrAccessChain:
    case OpCopyObject:
        break;
    case OpFConvert:
    case OpSConvert:
    case OpUConvert:
        // Look for any 8/16-bit storage capabilities. If there are none, assume that
        // the convert instruction requires the Float16/Int8/16 capability.
        if (containsType(typeId, OpTypeFloat, 16) || containsType(typeId, OpTypeInt, 16)) {
            bool foundStorage = false;
            for (auto it = capabilities.begin(); it != capabilities.end(); ++it) {
                spv::Capability cap = *it;
                if (cap == spv::CapabilityStorageInputOutput16 ||
                    cap == spv::CapabilityStoragePushConstant16 ||
                    cap == spv::CapabilityStorageUniformBufferBlock16 ||
                    cap == spv::CapabilityStorageUniform16) {
                    foundStorage = true;
                    break;
                }
            }
            if (!foundStorage) {
                if (containsType(typeId, OpTypeFloat, 16))
                    addCapability(CapabilityFloat16);
                if (containsType(typeId, OpTypeInt, 16))
                    addCapability(CapabilityInt16);
            }
        }
        if (containsType(typeId, OpTypeInt, 8)) {
            bool foundStorage = false;
            for (auto it = capabilities.begin(); it != capabilities.end(); ++it) {
                spv::Capability cap = *it;
                if (cap == spv::CapabilityStoragePushConstant8 ||
                    cap == spv::CapabilityUniformAndStorageBuffer8BitAccess ||
                    cap == spv::CapabilityStorageBuffer8BitAccess) {
                    foundStorage = true;
                    break;
                }
            }
            if (!foundStorage) {
                addCapability(CapabilityInt8);
            }
        }
        break;
    case OpExtInst:
        switch (inst.getImmediateOperand(1)) {
        case GLSLstd450Frexp:
        case GLSLstd450FrexpStruct:
            if (getSpvVersion() < glslang::EShTargetSpv_1_3 && containsType(typeId, OpTypeInt, 16))
                addExtension(spv::E_SPV_AMD_gpu_shader_int16);
            break;
        case GLSLstd450InterpolateAtCentroid:
        case GLSLstd450InterpolateAtSample:
        case GLSLstd450InterpolateAtOffset:
            if (getSpvVersion() < glslang::EShTargetSpv_1_3 && containsType(typeId, OpTypeFloat, 16))
                addExtension(spv::E_SPV_AMD_gpu_shader_half_float);
            break;
        default:
            break;
        }
        break;
    default:
        if (basicTypeOp == OpTypeFloat && width == 16)
            addCapability(CapabilityFloat16);
        if (basicTypeOp == OpTypeInt && width == 16)
            addCapability(CapabilityInt16);
        if (basicTypeOp == OpTypeInt && width == 8)
            addCapability(CapabilityInt8);
        break;
    }
}

// Called for each instruction that resides in a block.
void Builder::postProcess(Instruction& inst)
{
    // Add capabilities based simply on the opcode.
    switch (inst.getOpCode()) {
    case OpExtInst:
        switch (inst.getImmediateOperand(1)) {
        case GLSLstd450InterpolateAtCentroid:
        case GLSLstd450InterpolateAtSample:
        case GLSLstd450InterpolateAtOffset:
            addCapability(CapabilityInterpolationFunction);
            break;
        default:
            break;
        }
        break;
    case OpDPdxFine:
    case OpDPdyFine:
    case OpFwidthFine:
    case OpDPdxCoarse:
    case OpDPdyCoarse:
    case OpFwidthCoarse:
        addCapability(CapabilityDerivativeControl);
        break;

    case OpImageQueryLod:
    case OpImageQuerySize:
    case OpImageQuerySizeLod:
    case OpImageQuerySamples:
    case OpImageQueryLevels:
        addCapability(CapabilityImageQuery);
        break;

    case OpGroupNonUniformPartitionNV:
        addExtension(E_SPV_NV_shader_subgroup_partitioned);
        addCapability(CapabilityGroupNonUniformPartitionedNV);
        break;

    case OpLoad:
    case OpStore:
        {
            // For any load/store to a PhysicalStorageBufferEXT, walk the accesschain
            // index list to compute the misalignment. The pre-existing alignment value
            // (set via Builder::AccessChain::alignment) only accounts for the base of
            // the reference type and any scalar component selection in the accesschain,
            // and this function computes the rest from the SPIR-V Offset decorations.
            Instruction *accessChain = module.getInstruction(inst.getIdOperand(0));
            if (accessChain->getOpCode() == OpAccessChain) {
                Instruction *base = module.getInstruction(accessChain->getIdOperand(0));
                // Get the type of the base of the access chain. It must be a pointer type.
                Id typeId = base->getTypeId();
                Instruction *type = module.getInstruction(typeId);
                assert(type->getOpCode() == OpTypePointer);
                if (type->getImmediateOperand(0) != StorageClassPhysicalStorageBufferEXT) {
                    break;
                }
                // Get the pointee type.
                typeId = type->getIdOperand(1);
                type = module.getInstruction(typeId);
                // Walk the index list for the access chain. For each index, find any
                // misalignment that can apply when accessing the member/element via
                // Offset/ArrayStride/MatrixStride decorations, and bitwise OR them all
                // together.
                int alignment = 0;
                for (int i = 1; i < accessChain->getNumOperands(); ++i) {
                    Instruction *idx = module.getInstruction(accessChain->getIdOperand(i));
                    if (type->getOpCode() == OpTypeStruct) {
                        assert(idx->getOpCode() == OpConstant);
                        unsigned int c = idx->getImmediateOperand(0);

                        const auto function = [&](const std::unique_ptr<Instruction>& decoration) {
                            if (decoration.get()->getOpCode() == OpMemberDecorate &&
                                decoration.get()->getIdOperand(0) == typeId &&
                                decoration.get()->getImmediateOperand(1) == c &&
                                (decoration.get()->getImmediateOperand(2) == DecorationOffset ||
                                 decoration.get()->getImmediateOperand(2) == DecorationMatrixStride)) {
                                alignment |= decoration.get()->getImmediateOperand(3);
                            }
                        };
                        std::for_each(decorations.begin(), decorations.end(), function);
                        // get the next member type
                        typeId = type->getIdOperand(c);
                        type = module.getInstruction(typeId);
                    } else if (type->getOpCode() == OpTypeArray ||
                               type->getOpCode() == OpTypeRuntimeArray) {
                        const auto function = [&](const std::unique_ptr<Instruction>& decoration) {
                            if (decoration.get()->getOpCode() == OpDecorate &&
                                decoration.get()->getIdOperand(0) == typeId &&
                                decoration.get()->getImmediateOperand(1) == DecorationArrayStride) {
                                alignment |= decoration.get()->getImmediateOperand(2);
                            }
                        };
                        std::for_each(decorations.begin(), decorations.end(), function);
                        // Get the element type
                        typeId = type->getIdOperand(0);
                        type = module.getInstruction(typeId);
                    } else {
                        // Once we get to any non-aggregate type, we're done.
                        break;
                    }
                }
                assert(inst.getNumOperands() >= 3);
                unsigned int memoryAccess = inst.getImmediateOperand((inst.getOpCode() == OpStore) ? 2 : 1);
                assert(memoryAccess & MemoryAccessAlignedMask);
                static_cast<void>(memoryAccess);
                // Compute the index of the alignment operand.
                int alignmentIdx = 2;
                if (inst.getOpCode() == OpStore)
                    alignmentIdx++;
                // Merge new and old (mis)alignment
                alignment |= inst.getImmediateOperand(alignmentIdx);
                // Pick the LSB
                alignment = alignment & ~(alignment & (alignment-1));
                // update the Aligned operand
                inst.setImmediateOperand(alignmentIdx, alignment);
            }
            break;
        }

    default:
        break;
    }

    // Checks based on type
    if (inst.getTypeId() != NoType)
        postProcessType(inst, inst.getTypeId());
    for (int op = 0; op < inst.getNumOperands(); ++op) {
        if (inst.isIdOperand(op)) {
            // In blocks, these are always result ids, but we are relying on
            // getTypeId() to return NoType for things like OpLabel.
            if (getTypeId(inst.getIdOperand(op)) != NoType)
                postProcessType(inst, getTypeId(inst.getIdOperand(op)));
        }
    }
}
#endif

// comment in header
void Builder::postProcessCFG()
{
    // reachableBlocks is the set of blockss reached via control flow, or which are
    // unreachable continue targert or unreachable merge.
    std::unordered_set<const Block*> reachableBlocks;
    std::unordered_map<Block*, Block*> headerForUnreachableContinue;
    std::unordered_set<Block*> unreachableMerges;
    std::unordered_set<Id> unreachableDefinitions;
    // Collect IDs defined in unreachable blocks. For each function, label the
    // reachable blocks first. Then for each unreachable block, collect the
    // result IDs of the instructions in it.
    for (auto fi = module.getFunctions().cbegin(); fi != module.getFunctions().cend(); fi++) {
        Function* f = *fi;
        Block* entry = f->getEntryBlock();
        inReadableOrder(entry,
            [&reachableBlocks, &unreachableMerges, &headerForUnreachableContinue]
            (Block* b, ReachReason why, Block* header) {
               reachableBlocks.insert(b);
               if (why == ReachDeadContinue) headerForUnreachableContinue[b] = header;
               if (why == ReachDeadMerge) unreachableMerges.insert(b);
            });
        for (auto bi = f->getBlocks().cbegin(); bi != f->getBlocks().cend(); bi++) {
            Block* b = *bi;
            if (unreachableMerges.count(b) != 0 || headerForUnreachableContinue.count(b) != 0) {
                auto ii = b->getInstructions().cbegin();
                ++ii; // Keep potential decorations on the label.
                for (; ii != b->getInstructions().cend(); ++ii)
                    unreachableDefinitions.insert(ii->get()->getResultId());
            } else if (reachableBlocks.count(b) == 0) {
                // The normal case for unreachable code.  All definitions are considered dead.
                for (auto ii = b->getInstructions().cbegin(); ii != b->getInstructions().cend(); ++ii)
                    unreachableDefinitions.insert(ii->get()->getResultId());
            }
        }
    }

    // Modify unreachable merge blocks and unreachable continue targets.
    // Delete their contents.
    for (auto mergeIter = unreachableMerges.begin(); mergeIter != unreachableMerges.end(); ++mergeIter) {
        (*mergeIter)->rewriteAsCanonicalUnreachableMerge();
    }
    for (auto continueIter = headerForUnreachableContinue.begin();
         continueIter != headerForUnreachableContinue.end();
         ++continueIter) {
        Block* continue_target = continueIter->first;
        Block* header = continueIter->second;
        continue_target->rewriteAsCanonicalUnreachableContinue(header);
    }

    // Remove unneeded decorations, for unreachable instructions
    decorations.erase(std::remove_if(decorations.begin(), decorations.end(),
        [&unreachableDefinitions](std::unique_ptr<Instruction>& I) -> bool {
            Id decoration_id = I.get()->getIdOperand(0);
            return unreachableDefinitions.count(decoration_id) != 0;
        }),
        decorations.end());
}

#ifndef GLSLANG_WEB
// comment in header
void Builder::postProcessFeatures() {
    // Add per-instruction capabilities, extensions, etc.,

    // Look for any 8/16 bit type in physical storage buffer class, and set the
    // appropriate capability. This happens in createSpvVariable for other storage
    // classes, but there isn't always a variable for physical storage buffer.
    for (int t = 0; t < (int)groupedTypes[OpTypePointer].size(); ++t) {
        Instruction* type = groupedTypes[OpTypePointer][t];
        if (type->getImmediateOperand(0) == (unsigned)StorageClassPhysicalStorageBufferEXT) {
            if (containsType(type->getIdOperand(1), OpTypeInt, 8)) {
                addIncorporatedExtension(spv::E_SPV_KHR_8bit_storage, spv::Spv_1_5);
                addCapability(spv::CapabilityStorageBuffer8BitAccess);
            }
            if (containsType(type->getIdOperand(1), OpTypeInt, 16) ||
                containsType(type->getIdOperand(1), OpTypeFloat, 16)) {
                addIncorporatedExtension(spv::E_SPV_KHR_16bit_storage, spv::Spv_1_3);
                addCapability(spv::CapabilityStorageBuffer16BitAccess);
            }
        }
    }

    // process all block-contained instructions
    for (auto fi = module.getFunctions().cbegin(); fi != module.getFunctions().cend(); fi++) {
        Function* f = *fi;
        for (auto bi = f->getBlocks().cbegin(); bi != f->getBlocks().cend(); bi++) {
            Block* b = *bi;
            for (auto ii = b->getInstructions().cbegin(); ii != b->getInstructions().cend(); ii++)
                postProcess(*ii->get());

            // For all local variables that contain pointers to PhysicalStorageBufferEXT, check whether
            // there is an existing restrict/aliased decoration. If we don't find one, add Aliased as the
            // default.
            for (auto vi = b->getLocalVariables().cbegin(); vi != b->getLocalVariables().cend(); vi++) {
                const Instruction& inst = *vi->get();
                Id resultId = inst.getResultId();
                if (containsPhysicalStorageBufferOrArray(getDerefTypeId(resultId))) {
                    bool foundDecoration = false;
                    const auto function = [&](const std::unique_ptr<Instruction>& decoration) {
                        if (decoration.get()->getIdOperand(0) == resultId &&
                            decoration.get()->getOpCode() == OpDecorate &&
                            (decoration.get()->getImmediateOperand(1) == spv::DecorationAliasedPointerEXT ||
                             decoration.get()->getImmediateOperand(1) == spv::DecorationRestrictPointerEXT)) {
                            foundDecoration = true;
                        }
                    };
                    std::for_each(decorations.begin(), decorations.end(), function);
                    if (!foundDecoration) {
                        addDecoration(resultId, spv::DecorationAliasedPointerEXT);
                    }
                }
            }
        }
    }
}
#endif

// comment in header
void Builder::postProcess() {
  postProcessCFG();
#ifndef GLSLANG_WEB
  postProcessFeatures();
#endif
}

}; // end spv namespace