llvm.org GIT mirror llvm / 59d3ae6 lib / Target / NVPTX / NVPTXGenericToNVVM.cpp
59d3ae6

Tree @59d3ae6 (Download .tar.gz)

NVPTXGenericToNVVM.cpp @59d3ae6raw · history · blame

  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
//===-- GenericToNVVM.cpp - Convert generic module to NVVM module - C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Convert generic global variables into either .global or .const access based
// on the variable's "constant" qualifier.
//
//===----------------------------------------------------------------------===//

#include "NVPTX.h"
#include "NVPTXUtilities.h"
#include "MCTargetDesc/NVPTXBaseInfo.h"

#include "llvm/PassManager.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Operator.h"
#include "llvm/ADT/ValueMap.h"
#include "llvm/CodeGen/MachineFunctionAnalysis.h"
#include "llvm/CodeGen/ValueTypes.h"
#include "llvm/IR/IRBuilder.h"

using namespace llvm;

namespace llvm {
void initializeGenericToNVVMPass(PassRegistry &);
}

namespace {
class GenericToNVVM : public ModulePass {
public:
  static char ID;

  GenericToNVVM() : ModulePass(ID) {}

  virtual bool runOnModule(Module &M);

  virtual void getAnalysisUsage(AnalysisUsage &AU) const {
  }

private:
  Value *getOrInsertCVTA(Module *M, Function *F, GlobalVariable *GV,
                         IRBuilder<> &Builder);
  Value *remapConstant(Module *M, Function *F, Constant *C,
                       IRBuilder<> &Builder);
  Value *remapConstantVectorOrConstantAggregate(Module *M, Function *F,
                                                Constant *C,
                                                IRBuilder<> &Builder);
  Value *remapConstantExpr(Module *M, Function *F, ConstantExpr *C,
                           IRBuilder<> &Builder);
  void remapNamedMDNode(Module *M, NamedMDNode *N);
  MDNode *remapMDNode(Module *M, MDNode *N);

  typedef ValueMap<GlobalVariable *, GlobalVariable *> GVMapTy;
  typedef ValueMap<Constant *, Value *> ConstantToValueMapTy;
  GVMapTy GVMap;
  ConstantToValueMapTy ConstantToValueMap;
};
}

char GenericToNVVM::ID = 0;

ModulePass *llvm::createGenericToNVVMPass() { return new GenericToNVVM(); }

INITIALIZE_PASS(
    GenericToNVVM, "generic-to-nvvm",
    "Ensure that the global variables are in the global address space", false,
    false)

bool GenericToNVVM::runOnModule(Module &M) {
  // Create a clone of each global variable that has the default address space.
  // The clone is created with the global address space  specifier, and the pair
  // of original global variable and its clone is placed in the GVMap for later
  // use.

  for (Module::global_iterator I = M.global_begin(), E = M.global_end();
       I != E;) {
    GlobalVariable *GV = I++;
    if (GV->getType()->getAddressSpace() == llvm::ADDRESS_SPACE_GENERIC &&
        !llvm::isTexture(*GV) && !llvm::isSurface(*GV) &&
        !GV->getName().startswith("llvm.")) {
      GlobalVariable *NewGV = new GlobalVariable(
          M, GV->getType()->getElementType(), GV->isConstant(),
          GV->getLinkage(), GV->hasInitializer() ? GV->getInitializer() : NULL,
          "", GV, GV->getThreadLocalMode(), llvm::ADDRESS_SPACE_GLOBAL);
      NewGV->copyAttributesFrom(GV);
      GVMap[GV] = NewGV;
    }
  }

  // Return immediately, if every global variable has a specific address space
  // specifier.
  if (GVMap.empty()) {
    return false;
  }

  // Walk through the instructions in function defitinions, and replace any use
  // of original global variables in GVMap with a use of the corresponding
  // copies in GVMap.  If necessary, promote constants to instructions.
  for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
    if (I->isDeclaration()) {
      continue;
    }
    IRBuilder<> Builder(I->getEntryBlock().getFirstNonPHIOrDbg());
    for (Function::iterator BBI = I->begin(), BBE = I->end(); BBI != BBE;
         ++BBI) {
      for (BasicBlock::iterator II = BBI->begin(), IE = BBI->end(); II != IE;
           ++II) {
        for (unsigned i = 0, e = II->getNumOperands(); i < e; ++i) {
          Value *Operand = II->getOperand(i);
          if (isa<Constant>(Operand)) {
            II->setOperand(
                i, remapConstant(&M, I, cast<Constant>(Operand), Builder));
          }
        }
      }
    }
    ConstantToValueMap.clear();
  }

  // Walk through the metadata section and update the debug information
  // associated with the global variables in the default address space.
  for (Module::named_metadata_iterator I = M.named_metadata_begin(),
                                       E = M.named_metadata_end();
       I != E; I++) {
    remapNamedMDNode(&M, I);
  }

  // Walk through the global variable  initializers, and replace any use of
  // original global variables in GVMap with a use of the corresponding copies
  // in GVMap.  The copies need to be bitcast to the original global variable
  // types, as we cannot use cvta in global variable initializers.
  for (GVMapTy::iterator I = GVMap.begin(), E = GVMap.end(); I != E;) {
    GlobalVariable *GV = I->first;
    GlobalVariable *NewGV = I->second;
    ++I;
    Constant *BitCastNewGV = ConstantExpr::getPointerCast(NewGV, GV->getType());
    // At this point, the remaining uses of GV should be found only in global
    // variable initializers, as other uses have been already been removed
    // while walking through the instructions in function definitions.
    for (Value::use_iterator UI = GV->use_begin(), UE = GV->use_end();
         UI != UE;) {
      Use &U = (UI++).getUse();
      U.set(BitCastNewGV);
    }
    std::string Name = GV->getName();
    GV->removeDeadConstantUsers();
    GV->eraseFromParent();
    NewGV->setName(Name);
  }
  GVMap.clear();

  return true;
}

Value *GenericToNVVM::getOrInsertCVTA(Module *M, Function *F,
                                      GlobalVariable *GV,
                                      IRBuilder<> &Builder) {
  PointerType *GVType = GV->getType();
  Value *CVTA = NULL;

  // See if the address space conversion requires the operand to be bitcast
  // to i8 addrspace(n)* first.
  EVT ExtendedGVType = EVT::getEVT(GVType->getElementType(), true);
  if (!ExtendedGVType.isInteger() && !ExtendedGVType.isFloatingPoint()) {
    // A bitcast to i8 addrspace(n)* on the operand is needed.
    LLVMContext &Context = M->getContext();
    unsigned int AddrSpace = GVType->getAddressSpace();
    Type *DestTy = PointerType::get(Type::getInt8Ty(Context), AddrSpace);
    CVTA = Builder.CreateBitCast(GV, DestTy, "cvta");
    // Insert the address space conversion.
    Type *ResultType =
        PointerType::get(Type::getInt8Ty(Context), llvm::ADDRESS_SPACE_GENERIC);
    SmallVector<Type *, 2> ParamTypes;
    ParamTypes.push_back(ResultType);
    ParamTypes.push_back(DestTy);
    Function *CVTAFunction = Intrinsic::getDeclaration(
        M, Intrinsic::nvvm_ptr_global_to_gen, ParamTypes);
    CVTA = Builder.CreateCall(CVTAFunction, CVTA, "cvta");
    // Another bitcast from i8 * to <the element type of GVType> * is
    // required.
    DestTy =
        PointerType::get(GVType->getElementType(), llvm::ADDRESS_SPACE_GENERIC);
    CVTA = Builder.CreateBitCast(CVTA, DestTy, "cvta");
  } else {
    // A simple CVTA is enough.
    SmallVector<Type *, 2> ParamTypes;
    ParamTypes.push_back(PointerType::get(GVType->getElementType(),
                                          llvm::ADDRESS_SPACE_GENERIC));
    ParamTypes.push_back(GVType);
    Function *CVTAFunction = Intrinsic::getDeclaration(
        M, Intrinsic::nvvm_ptr_global_to_gen, ParamTypes);
    CVTA = Builder.CreateCall(CVTAFunction, GV, "cvta");
  }

  return CVTA;
}

Value *GenericToNVVM::remapConstant(Module *M, Function *F, Constant *C,
                                    IRBuilder<> &Builder) {
  // If the constant C has been converted already in the given function  F, just
  // return the converted value.
  ConstantToValueMapTy::iterator CTII = ConstantToValueMap.find(C);
  if (CTII != ConstantToValueMap.end()) {
    return CTII->second;
  }

  Value *NewValue = C;
  if (isa<GlobalVariable>(C)) {
    // If the constant C is a global variable and is found in  GVMap, generate a
    // set set of instructions that convert the clone of C with the global
    // address space specifier to a generic pointer.
    // The constant C cannot be used here, as it will be erased from the
    // module eventually.  And the clone of C with the global address space
    // specifier cannot be used here either, as it will affect the types of
    // other instructions in the function.  Hence, this address space conversion
    // is required.
    GVMapTy::iterator I = GVMap.find(cast<GlobalVariable>(C));
    if (I != GVMap.end()) {
      NewValue = getOrInsertCVTA(M, F, I->second, Builder);
    }
  } else if (isa<ConstantVector>(C) || isa<ConstantArray>(C) ||
             isa<ConstantStruct>(C)) {
    // If any element in the constant vector or aggregate C is or uses a global
    // variable in GVMap, the constant C needs to be reconstructed, using a set
    // of instructions.
    NewValue = remapConstantVectorOrConstantAggregate(M, F, C, Builder);
  } else if (isa<ConstantExpr>(C)) {
    // If any operand in the constant expression C is or uses a global variable
    // in GVMap, the constant expression C needs to be reconstructed, using a
    // set of instructions.
    NewValue = remapConstantExpr(M, F, cast<ConstantExpr>(C), Builder);
  }

  ConstantToValueMap[C] = NewValue;
  return NewValue;
}

Value *GenericToNVVM::remapConstantVectorOrConstantAggregate(
    Module *M, Function *F, Constant *C, IRBuilder<> &Builder) {
  bool OperandChanged = false;
  SmallVector<Value *, 4> NewOperands;
  unsigned NumOperands = C->getNumOperands();

  // Check if any element is or uses a global variable in  GVMap, and thus
  // converted to another value.
  for (unsigned i = 0; i < NumOperands; ++i) {
    Value *Operand = C->getOperand(i);
    Value *NewOperand = remapConstant(M, F, cast<Constant>(Operand), Builder);
    OperandChanged |= Operand != NewOperand;
    NewOperands.push_back(NewOperand);
  }

  // If none of the elements has been modified, return C as it is.
  if (!OperandChanged) {
    return C;
  }

  // If any of the elements has been  modified, construct the equivalent
  // vector or aggregate value with a set instructions and the converted
  // elements.
  Value *NewValue = UndefValue::get(C->getType());
  if (isa<ConstantVector>(C)) {
    for (unsigned i = 0; i < NumOperands; ++i) {
      Value *Idx = ConstantInt::get(Type::getInt32Ty(M->getContext()), i);
      NewValue = Builder.CreateInsertElement(NewValue, NewOperands[i], Idx);
    }
  } else {
    for (unsigned i = 0; i < NumOperands; ++i) {
      NewValue =
          Builder.CreateInsertValue(NewValue, NewOperands[i], makeArrayRef(i));
    }
  }

  return NewValue;
}

Value *GenericToNVVM::remapConstantExpr(Module *M, Function *F, ConstantExpr *C,
                                        IRBuilder<> &Builder) {
  bool OperandChanged = false;
  SmallVector<Value *, 4> NewOperands;
  unsigned NumOperands = C->getNumOperands();

  // Check if any operand is or uses a global variable in  GVMap, and thus
  // converted to another value.
  for (unsigned i = 0; i < NumOperands; ++i) {
    Value *Operand = C->getOperand(i);
    Value *NewOperand = remapConstant(M, F, cast<Constant>(Operand), Builder);
    OperandChanged |= Operand != NewOperand;
    NewOperands.push_back(NewOperand);
  }

  // If none of the operands has been modified, return C as it is.
  if (!OperandChanged) {
    return C;
  }

  // If any of the operands has been modified, construct the instruction with
  // the converted operands.
  unsigned Opcode = C->getOpcode();
  switch (Opcode) {
  case Instruction::ICmp:
    // CompareConstantExpr (icmp)
    return Builder.CreateICmp(CmpInst::Predicate(C->getPredicate()),
                              NewOperands[0], NewOperands[1]);
  case Instruction::FCmp:
    // CompareConstantExpr (fcmp)
    assert(false && "Address space conversion should have no effect "
                    "on float point CompareConstantExpr (fcmp)!");
    return C;
  case Instruction::ExtractElement:
    // ExtractElementConstantExpr
    return Builder.CreateExtractElement(NewOperands[0], NewOperands[1]);
  case Instruction::InsertElement:
    // InsertElementConstantExpr
    return Builder.CreateInsertElement(NewOperands[0], NewOperands[1],
                                       NewOperands[2]);
  case Instruction::ShuffleVector:
    // ShuffleVector
    return Builder.CreateShuffleVector(NewOperands[0], NewOperands[1],
                                       NewOperands[2]);
  case Instruction::ExtractValue:
    // ExtractValueConstantExpr
    return Builder.CreateExtractValue(NewOperands[0], C->getIndices());
  case Instruction::InsertValue:
    // InsertValueConstantExpr
    return Builder.CreateInsertValue(NewOperands[0], NewOperands[1],
                                     C->getIndices());
  case Instruction::GetElementPtr:
    // GetElementPtrConstantExpr
    return cast<GEPOperator>(C)->isInBounds()
               ? Builder.CreateGEP(
                     NewOperands[0],
                     makeArrayRef(&NewOperands[1], NumOperands - 1))
               : Builder.CreateInBoundsGEP(
                     NewOperands[0],
                     makeArrayRef(&NewOperands[1], NumOperands - 1));
  case Instruction::Select:
    // SelectConstantExpr
    return Builder.CreateSelect(NewOperands[0], NewOperands[1], NewOperands[2]);
  default:
    // BinaryConstantExpr
    if (Instruction::isBinaryOp(Opcode)) {
      return Builder.CreateBinOp(Instruction::BinaryOps(C->getOpcode()),
                                 NewOperands[0], NewOperands[1]);
    }
    // UnaryConstantExpr
    if (Instruction::isCast(Opcode)) {
      return Builder.CreateCast(Instruction::CastOps(C->getOpcode()),
                                NewOperands[0], C->getType());
    }
    assert(false && "GenericToNVVM encountered an unsupported ConstantExpr");
    return C;
  }
}

void GenericToNVVM::remapNamedMDNode(Module *M, NamedMDNode *N) {

  bool OperandChanged = false;
  SmallVector<MDNode *, 16> NewOperands;
  unsigned NumOperands = N->getNumOperands();

  // Check if any operand is or contains a global variable in  GVMap, and thus
  // converted to another value.
  for (unsigned i = 0; i < NumOperands; ++i) {
    MDNode *Operand = N->getOperand(i);
    MDNode *NewOperand = remapMDNode(M, Operand);
    OperandChanged |= Operand != NewOperand;
    NewOperands.push_back(NewOperand);
  }

  // If none of the operands has been modified, return immediately.
  if (!OperandChanged) {
    return;
  }

  // Replace the old operands with the new operands.
  N->dropAllReferences();
  for (SmallVectorImpl<MDNode *>::iterator I = NewOperands.begin(),
                                           E = NewOperands.end();
       I != E; ++I) {
    N->addOperand(*I);
  }
}

MDNode *GenericToNVVM::remapMDNode(Module *M, MDNode *N) {

  bool OperandChanged = false;
  SmallVector<Value *, 8> NewOperands;
  unsigned NumOperands = N->getNumOperands();

  // Check if any operand is or contains a global variable in  GVMap, and thus
  // converted to another value.
  for (unsigned i = 0; i < NumOperands; ++i) {
    Value *Operand = N->getOperand(i);
    Value *NewOperand = Operand;
    if (Operand) {
      if (isa<GlobalVariable>(Operand)) {
        GVMapTy::iterator I = GVMap.find(cast<GlobalVariable>(Operand));
        if (I != GVMap.end()) {
          NewOperand = I->second;
          if (++i < NumOperands) {
            NewOperands.push_back(NewOperand);
            // Address space of the global variable follows the global variable
            // in the global variable debug info (see createGlobalVariable in
            // lib/Analysis/DIBuilder.cpp).
            NewOperand =
                ConstantInt::get(Type::getInt32Ty(M->getContext()),
                                 I->second->getType()->getAddressSpace());
          }
        }
      } else if (isa<MDNode>(Operand)) {
        NewOperand = remapMDNode(M, cast<MDNode>(Operand));
      }
    }
    OperandChanged |= Operand != NewOperand;
    NewOperands.push_back(NewOperand);
  }

  // If none of the operands has been modified, return N as it is.
  if (!OperandChanged) {
    return N;
  }

  // If any of the operands has been modified, create a new MDNode with the new
  // operands.
  return MDNode::get(M->getContext(), makeArrayRef(NewOperands));
}