Coverage Report

Created: 2017-10-03 07:32

/Users/buildslave/jenkins/sharedspace/clang-stage2-coverage-R@2/llvm/lib/CodeGen/IntrinsicLowering.cpp
Line
Count
Source (jump to first uncovered line)
1
//===-- IntrinsicLowering.cpp - Intrinsic Lowering default implementation -===//
2
//
3
//                     The LLVM Compiler Infrastructure
4
//
5
// This file is distributed under the University of Illinois Open Source
6
// License. See LICENSE.TXT for details.
7
//
8
//===----------------------------------------------------------------------===//
9
//
10
// This file implements the IntrinsicLowering class.
11
//
12
//===----------------------------------------------------------------------===//
13
14
#include "llvm/CodeGen/IntrinsicLowering.h"
15
#include "llvm/ADT/SmallVector.h"
16
#include "llvm/IR/CallSite.h"
17
#include "llvm/IR/Constants.h"
18
#include "llvm/IR/DataLayout.h"
19
#include "llvm/IR/DerivedTypes.h"
20
#include "llvm/IR/IRBuilder.h"
21
#include "llvm/IR/Module.h"
22
#include "llvm/IR/Type.h"
23
#include "llvm/Support/ErrorHandling.h"
24
#include "llvm/Support/raw_ostream.h"
25
using namespace llvm;
26
27
template <class ArgIt>
28
static void EnsureFunctionExists(Module &M, const char *Name,
29
                                 ArgIt ArgBegin, ArgIt ArgEnd,
30
0
                                 Type *RetTy) {
31
0
  // Insert a correctly-typed definition now.
32
0
  std::vector<Type *> ParamTys;
33
0
  for (ArgIt I = ArgBegin; 
I != ArgEnd0
;
++I0
)
34
0
    ParamTys.push_back(I->getType());
35
0
  M.getOrInsertFunction(Name, FunctionType::get(RetTy, ParamTys, false));
36
0
}
37
38
static void EnsureFPIntrinsicsExist(Module &M, Function &Fn,
39
                                    const char *FName,
40
0
                                    const char *DName, const char *LDName) {
41
0
  // Insert definitions for all the floating point types.
42
0
  switch((int)Fn.arg_begin()->getType()->getTypeID()) {
43
0
  case Type::FloatTyID:
44
0
    EnsureFunctionExists(M, FName, Fn.arg_begin(), Fn.arg_end(),
45
0
                         Type::getFloatTy(M.getContext()));
46
0
    break;
47
0
  case Type::DoubleTyID:
48
0
    EnsureFunctionExists(M, DName, Fn.arg_begin(), Fn.arg_end(),
49
0
                         Type::getDoubleTy(M.getContext()));
50
0
    break;
51
0
  case Type::X86_FP80TyID:
52
0
  case Type::FP128TyID:
53
0
  case Type::PPC_FP128TyID:
54
0
    EnsureFunctionExists(M, LDName, Fn.arg_begin(), Fn.arg_end(),
55
0
                         Fn.arg_begin()->getType());
56
0
    break;
57
0
  }
58
0
}
59
60
/// ReplaceCallWith - This function is used when we want to lower an intrinsic
61
/// call to a call of an external function.  This handles hard cases such as
62
/// when there was already a prototype for the external function, and if that
63
/// prototype doesn't match the arguments we expect to pass in.
64
template <class ArgIt>
65
static CallInst *ReplaceCallWith(const char *NewFn, CallInst *CI,
66
                                 ArgIt ArgBegin, ArgIt ArgEnd,
67
0
                                 Type *RetTy) {
68
0
  // If we haven't already looked up this function, check to see if the
69
0
  // program already contains a function with this name.
70
0
  Module *M = CI->getModule();
71
0
  // Get or insert the definition now.
72
0
  std::vector<Type *> ParamTys;
73
0
  for (ArgIt I = ArgBegin; 
I != ArgEnd0
;
++I0
)
74
0
    ParamTys.push_back((*I)->getType());
75
0
  Constant* FCache = M->getOrInsertFunction(NewFn,
76
0
                                  FunctionType::get(RetTy, ParamTys, false));
77
0
78
0
  IRBuilder<> Builder(CI->getParent(), CI->getIterator());
79
0
  SmallVector<Value *, 8> Args(ArgBegin, ArgEnd);
80
0
  CallInst *NewCI = Builder.CreateCall(FCache, Args);
81
0
  NewCI->setName(CI->getName());
82
0
  if (!CI->use_empty())
83
0
    CI->replaceAllUsesWith(NewCI);
84
0
  return NewCI;
85
0
}
Unexecuted instantiation: IntrinsicLowering.cpp:llvm::CallInst* ReplaceCallWith<llvm::Use*>(char const*, llvm::CallInst*, llvm::Use*, llvm::Use*, llvm::Type*)
Unexecuted instantiation: IntrinsicLowering.cpp:llvm::CallInst* ReplaceCallWith<llvm::Value**>(char const*, llvm::CallInst*, llvm::Value**, llvm::Value**, llvm::Type*)
86
87
// VisualStudio defines setjmp as _setjmp
88
#if defined(_MSC_VER) && defined(setjmp) && \
89
                         !defined(setjmp_undefined_for_msvc)
90
#  pragma push_macro("setjmp")
91
#  undef setjmp
92
#  define setjmp_undefined_for_msvc
93
#endif
94
95
0
void IntrinsicLowering::AddPrototypes(Module &M) {
96
0
  LLVMContext &Context = M.getContext();
97
0
  for (auto &F : M)
98
0
    
if (0
F.isDeclaration() && 0
!F.use_empty()0
)
99
0
      switch (F.getIntrinsicID()) {
100
0
      default: break;
101
0
      case Intrinsic::setjmp:
102
0
        EnsureFunctionExists(M, "setjmp", F.arg_begin(), F.arg_end(),
103
0
                             Type::getInt32Ty(M.getContext()));
104
0
        break;
105
0
      case Intrinsic::longjmp:
106
0
        EnsureFunctionExists(M, "longjmp", F.arg_begin(), F.arg_end(),
107
0
                             Type::getVoidTy(M.getContext()));
108
0
        break;
109
0
      case Intrinsic::siglongjmp:
110
0
        EnsureFunctionExists(M, "abort", F.arg_end(), F.arg_end(),
111
0
                             Type::getVoidTy(M.getContext()));
112
0
        break;
113
0
      case Intrinsic::memcpy:
114
0
        M.getOrInsertFunction("memcpy",
115
0
          Type::getInt8PtrTy(Context),
116
0
                              Type::getInt8PtrTy(Context), 
117
0
                              Type::getInt8PtrTy(Context), 
118
0
                              DL.getIntPtrType(Context));
119
0
        break;
120
0
      case Intrinsic::memmove:
121
0
        M.getOrInsertFunction("memmove",
122
0
          Type::getInt8PtrTy(Context),
123
0
                              Type::getInt8PtrTy(Context), 
124
0
                              Type::getInt8PtrTy(Context), 
125
0
                              DL.getIntPtrType(Context));
126
0
        break;
127
0
      case Intrinsic::memset:
128
0
        M.getOrInsertFunction("memset",
129
0
          Type::getInt8PtrTy(Context),
130
0
                              Type::getInt8PtrTy(Context), 
131
0
                              Type::getInt32Ty(M.getContext()), 
132
0
                              DL.getIntPtrType(Context));
133
0
        break;
134
0
      case Intrinsic::sqrt:
135
0
        EnsureFPIntrinsicsExist(M, F, "sqrtf", "sqrt", "sqrtl");
136
0
        break;
137
0
      case Intrinsic::sin:
138
0
        EnsureFPIntrinsicsExist(M, F, "sinf", "sin", "sinl");
139
0
        break;
140
0
      case Intrinsic::cos:
141
0
        EnsureFPIntrinsicsExist(M, F, "cosf", "cos", "cosl");
142
0
        break;
143
0
      case Intrinsic::pow:
144
0
        EnsureFPIntrinsicsExist(M, F, "powf", "pow", "powl");
145
0
        break;
146
0
      case Intrinsic::log:
147
0
        EnsureFPIntrinsicsExist(M, F, "logf", "log", "logl");
148
0
        break;
149
0
      case Intrinsic::log2:
150
0
        EnsureFPIntrinsicsExist(M, F, "log2f", "log2", "log2l");
151
0
        break;
152
0
      case Intrinsic::log10:
153
0
        EnsureFPIntrinsicsExist(M, F, "log10f", "log10", "log10l");
154
0
        break;
155
0
      case Intrinsic::exp:
156
0
        EnsureFPIntrinsicsExist(M, F, "expf", "exp", "expl");
157
0
        break;
158
0
      case Intrinsic::exp2:
159
0
        EnsureFPIntrinsicsExist(M, F, "exp2f", "exp2", "exp2l");
160
0
        break;
161
0
      }
162
0
}
163
164
/// LowerBSWAP - Emit the code to lower bswap of V before the specified
165
/// instruction IP.
166
0
static Value *LowerBSWAP(LLVMContext &Context, Value *V, Instruction *IP) {
167
0
  assert(V->getType()->isIntegerTy() && "Can't bswap a non-integer type!");
168
0
169
0
  unsigned BitSize = V->getType()->getPrimitiveSizeInBits();
170
0
171
0
  IRBuilder<> Builder(IP);
172
0
173
0
  switch(BitSize) {
174
0
  
default: 0
llvm_unreachable0
("Unhandled type size of value to byteswap!");
175
0
  case 16: {
176
0
    Value *Tmp1 = Builder.CreateShl(V, ConstantInt::get(V->getType(), 8),
177
0
                                    "bswap.2");
178
0
    Value *Tmp2 = Builder.CreateLShr(V, ConstantInt::get(V->getType(), 8),
179
0
                                     "bswap.1");
180
0
    V = Builder.CreateOr(Tmp1, Tmp2, "bswap.i16");
181
0
    break;
182
0
  }
183
0
  case 32: {
184
0
    Value *Tmp4 = Builder.CreateShl(V, ConstantInt::get(V->getType(), 24),
185
0
                                    "bswap.4");
186
0
    Value *Tmp3 = Builder.CreateShl(V, ConstantInt::get(V->getType(), 8),
187
0
                                    "bswap.3");
188
0
    Value *Tmp2 = Builder.CreateLShr(V, ConstantInt::get(V->getType(), 8),
189
0
                                     "bswap.2");
190
0
    Value *Tmp1 = Builder.CreateLShr(V,ConstantInt::get(V->getType(), 24),
191
0
                                     "bswap.1");
192
0
    Tmp3 = Builder.CreateAnd(Tmp3,
193
0
                         ConstantInt::get(Type::getInt32Ty(Context), 0xFF0000),
194
0
                             "bswap.and3");
195
0
    Tmp2 = Builder.CreateAnd(Tmp2,
196
0
                           ConstantInt::get(Type::getInt32Ty(Context), 0xFF00),
197
0
                             "bswap.and2");
198
0
    Tmp4 = Builder.CreateOr(Tmp4, Tmp3, "bswap.or1");
199
0
    Tmp2 = Builder.CreateOr(Tmp2, Tmp1, "bswap.or2");
200
0
    V = Builder.CreateOr(Tmp4, Tmp2, "bswap.i32");
201
0
    break;
202
0
  }
203
0
  case 64: {
204
0
    Value *Tmp8 = Builder.CreateShl(V, ConstantInt::get(V->getType(), 56),
205
0
                                    "bswap.8");
206
0
    Value *Tmp7 = Builder.CreateShl(V, ConstantInt::get(V->getType(), 40),
207
0
                                    "bswap.7");
208
0
    Value *Tmp6 = Builder.CreateShl(V, ConstantInt::get(V->getType(), 24),
209
0
                                    "bswap.6");
210
0
    Value *Tmp5 = Builder.CreateShl(V, ConstantInt::get(V->getType(), 8),
211
0
                                    "bswap.5");
212
0
    Value* Tmp4 = Builder.CreateLShr(V, ConstantInt::get(V->getType(), 8),
213
0
                                     "bswap.4");
214
0
    Value* Tmp3 = Builder.CreateLShr(V, 
215
0
                                     ConstantInt::get(V->getType(), 24),
216
0
                                     "bswap.3");
217
0
    Value* Tmp2 = Builder.CreateLShr(V, 
218
0
                                     ConstantInt::get(V->getType(), 40),
219
0
                                     "bswap.2");
220
0
    Value* Tmp1 = Builder.CreateLShr(V, 
221
0
                                     ConstantInt::get(V->getType(), 56),
222
0
                                     "bswap.1");
223
0
    Tmp7 = Builder.CreateAnd(Tmp7,
224
0
                             ConstantInt::get(Type::getInt64Ty(Context),
225
0
                                              0xFF000000000000ULL),
226
0
                             "bswap.and7");
227
0
    Tmp6 = Builder.CreateAnd(Tmp6,
228
0
                             ConstantInt::get(Type::getInt64Ty(Context),
229
0
                                              0xFF0000000000ULL),
230
0
                             "bswap.and6");
231
0
    Tmp5 = Builder.CreateAnd(Tmp5,
232
0
                        ConstantInt::get(Type::getInt64Ty(Context),
233
0
                             0xFF00000000ULL),
234
0
                             "bswap.and5");
235
0
    Tmp4 = Builder.CreateAnd(Tmp4,
236
0
                        ConstantInt::get(Type::getInt64Ty(Context),
237
0
                             0xFF000000ULL),
238
0
                             "bswap.and4");
239
0
    Tmp3 = Builder.CreateAnd(Tmp3,
240
0
                             ConstantInt::get(Type::getInt64Ty(Context),
241
0
                             0xFF0000ULL),
242
0
                             "bswap.and3");
243
0
    Tmp2 = Builder.CreateAnd(Tmp2,
244
0
                             ConstantInt::get(Type::getInt64Ty(Context),
245
0
                             0xFF00ULL),
246
0
                             "bswap.and2");
247
0
    Tmp8 = Builder.CreateOr(Tmp8, Tmp7, "bswap.or1");
248
0
    Tmp6 = Builder.CreateOr(Tmp6, Tmp5, "bswap.or2");
249
0
    Tmp4 = Builder.CreateOr(Tmp4, Tmp3, "bswap.or3");
250
0
    Tmp2 = Builder.CreateOr(Tmp2, Tmp1, "bswap.or4");
251
0
    Tmp8 = Builder.CreateOr(Tmp8, Tmp6, "bswap.or5");
252
0
    Tmp4 = Builder.CreateOr(Tmp4, Tmp2, "bswap.or6");
253
0
    V = Builder.CreateOr(Tmp8, Tmp4, "bswap.i64");
254
0
    break;
255
0
  }
256
0
  }
257
0
  return V;
258
0
}
259
260
/// LowerCTPOP - Emit the code to lower ctpop of V before the specified
261
/// instruction IP.
262
0
static Value *LowerCTPOP(LLVMContext &Context, Value *V, Instruction *IP) {
263
0
  assert(V->getType()->isIntegerTy() && "Can't ctpop a non-integer type!");
264
0
265
0
  static const uint64_t MaskValues[6] = {
266
0
    0x5555555555555555ULL, 0x3333333333333333ULL,
267
0
    0x0F0F0F0F0F0F0F0FULL, 0x00FF00FF00FF00FFULL,
268
0
    0x0000FFFF0000FFFFULL, 0x00000000FFFFFFFFULL
269
0
  };
270
0
271
0
  IRBuilder<> Builder(IP);
272
0
273
0
  unsigned BitSize = V->getType()->getPrimitiveSizeInBits();
274
0
  unsigned WordSize = (BitSize + 63) / 64;
275
0
  Value *Count = ConstantInt::get(V->getType(), 0);
276
0
277
0
  for (unsigned n = 0; 
n < WordSize0
;
++n0
) {
278
0
    Value *PartValue = V;
279
0
    for (unsigned i = 1, ct = 0; 
i < (BitSize>64 ? 0
640
:
BitSize0
);
280
0
         
i <<= 1, ++ct0
) {
281
0
      Value *MaskCst = ConstantInt::get(V->getType(), MaskValues[ct]);
282
0
      Value *LHS = Builder.CreateAnd(PartValue, MaskCst, "cppop.and1");
283
0
      Value *VShift = Builder.CreateLShr(PartValue,
284
0
                                        ConstantInt::get(V->getType(), i),
285
0
                                         "ctpop.sh");
286
0
      Value *RHS = Builder.CreateAnd(VShift, MaskCst, "cppop.and2");
287
0
      PartValue = Builder.CreateAdd(LHS, RHS, "ctpop.step");
288
0
    }
289
0
    Count = Builder.CreateAdd(PartValue, Count, "ctpop.part");
290
0
    if (
BitSize > 640
) {
291
0
      V = Builder.CreateLShr(V, ConstantInt::get(V->getType(), 64),
292
0
                             "ctpop.part.sh");
293
0
      BitSize -= 64;
294
0
    }
295
0
  }
296
0
297
0
  return Count;
298
0
}
299
300
/// LowerCTLZ - Emit the code to lower ctlz of V before the specified
301
/// instruction IP.
302
0
static Value *LowerCTLZ(LLVMContext &Context, Value *V, Instruction *IP) {
303
0
304
0
  IRBuilder<> Builder(IP);
305
0
306
0
  unsigned BitSize = V->getType()->getPrimitiveSizeInBits();
307
0
  for (unsigned i = 1; 
i < BitSize0
;
i <<= 10
) {
308
0
    Value *ShVal = ConstantInt::get(V->getType(), i);
309
0
    ShVal = Builder.CreateLShr(V, ShVal, "ctlz.sh");
310
0
    V = Builder.CreateOr(V, ShVal, "ctlz.step");
311
0
  }
312
0
313
0
  V = Builder.CreateNot(V);
314
0
  return LowerCTPOP(Context, V, IP);
315
0
}
316
317
static void ReplaceFPIntrinsicWithCall(CallInst *CI, const char *Fname,
318
                                       const char *Dname,
319
0
                                       const char *LDname) {
320
0
  CallSite CS(CI);
321
0
  switch (CI->getArgOperand(0)->getType()->getTypeID()) {
322
0
  
default: 0
llvm_unreachable0
("Invalid type in intrinsic");
323
0
  case Type::FloatTyID:
324
0
    ReplaceCallWith(Fname, CI, CS.arg_begin(), CS.arg_end(),
325
0
                  Type::getFloatTy(CI->getContext()));
326
0
    break;
327
0
  case Type::DoubleTyID:
328
0
    ReplaceCallWith(Dname, CI, CS.arg_begin(), CS.arg_end(),
329
0
                  Type::getDoubleTy(CI->getContext()));
330
0
    break;
331
0
  case Type::X86_FP80TyID:
332
0
  case Type::FP128TyID:
333
0
  case Type::PPC_FP128TyID:
334
0
    ReplaceCallWith(LDname, CI, CS.arg_begin(), CS.arg_end(),
335
0
                  CI->getArgOperand(0)->getType());
336
0
    break;
337
0
  }
338
0
}
339
340
0
void IntrinsicLowering::LowerIntrinsicCall(CallInst *CI) {
341
0
  IRBuilder<> Builder(CI);
342
0
  LLVMContext &Context = CI->getContext();
343
0
344
0
  const Function *Callee = CI->getCalledFunction();
345
0
  assert(Callee && "Cannot lower an indirect call!");
346
0
347
0
  CallSite CS(CI);
348
0
  switch (Callee->getIntrinsicID()) {
349
0
  case Intrinsic::not_intrinsic:
350
0
    report_fatal_error("Cannot lower a call to a non-intrinsic function '"+
351
0
                      Callee->getName() + "'!");
352
0
  default:
353
0
    report_fatal_error("Code generator does not support intrinsic function '"+
354
0
                      Callee->getName()+"'!");
355
0
356
0
  case Intrinsic::expect: {
357
0
    // Just replace __builtin_expect(exp, c) with EXP.
358
0
    Value *V = CI->getArgOperand(0);
359
0
    CI->replaceAllUsesWith(V);
360
0
    break;
361
0
  }
362
0
363
0
    // The setjmp/longjmp intrinsics should only exist in the code if it was
364
0
    // never optimized (ie, right out of the CFE), or if it has been hacked on
365
0
    // by the lowerinvoke pass.  In both cases, the right thing to do is to
366
0
    // convert the call to an explicit setjmp or longjmp call.
367
0
  case Intrinsic::setjmp: {
368
0
    Value *V = ReplaceCallWith("setjmp", CI, CS.arg_begin(), CS.arg_end(),
369
0
                               Type::getInt32Ty(Context));
370
0
    if (!CI->getType()->isVoidTy())
371
0
      CI->replaceAllUsesWith(V);
372
0
    break;
373
0
  }
374
0
  case Intrinsic::sigsetjmp:
375
0
     if (!CI->getType()->isVoidTy())
376
0
       CI->replaceAllUsesWith(Constant::getNullValue(CI->getType()));
377
0
     break;
378
0
379
0
  case Intrinsic::longjmp: {
380
0
    ReplaceCallWith("longjmp", CI, CS.arg_begin(), CS.arg_end(),
381
0
                    Type::getVoidTy(Context));
382
0
    break;
383
0
  }
384
0
385
0
  case Intrinsic::siglongjmp: {
386
0
    // Insert the call to abort
387
0
    ReplaceCallWith("abort", CI, CS.arg_end(), CS.arg_end(), 
388
0
                    Type::getVoidTy(Context));
389
0
    break;
390
0
  }
391
0
  case Intrinsic::ctpop:
392
0
    CI->replaceAllUsesWith(LowerCTPOP(Context, CI->getArgOperand(0), CI));
393
0
    break;
394
0
395
0
  case Intrinsic::bswap:
396
0
    CI->replaceAllUsesWith(LowerBSWAP(Context, CI->getArgOperand(0), CI));
397
0
    break;
398
0
    
399
0
  case Intrinsic::ctlz:
400
0
    CI->replaceAllUsesWith(LowerCTLZ(Context, CI->getArgOperand(0), CI));
401
0
    break;
402
0
403
0
  case Intrinsic::cttz: {
404
0
    // cttz(x) -> ctpop(~X & (X-1))
405
0
    Value *Src = CI->getArgOperand(0);
406
0
    Value *NotSrc = Builder.CreateNot(Src);
407
0
    NotSrc->setName(Src->getName() + ".not");
408
0
    Value *SrcM1 = ConstantInt::get(Src->getType(), 1);
409
0
    SrcM1 = Builder.CreateSub(Src, SrcM1);
410
0
    Src = LowerCTPOP(Context, Builder.CreateAnd(NotSrc, SrcM1), CI);
411
0
    CI->replaceAllUsesWith(Src);
412
0
    break;
413
0
  }
414
0
415
0
  case Intrinsic::stacksave:
416
0
  case Intrinsic::stackrestore: {
417
0
    if (!Warned)
418
0
      errs() << "WARNING: this target does not support the llvm.stack"
419
0
             << (Callee->getIntrinsicID() == Intrinsic::stacksave ?
420
0
               
"save"0
:
"restore"0
) << " intrinsic.\n";
421
0
    Warned = true;
422
0
    if (Callee->getIntrinsicID() == Intrinsic::stacksave)
423
0
      CI->replaceAllUsesWith(Constant::getNullValue(CI->getType()));
424
0
    break;
425
0
  }
426
0
    
427
0
  case Intrinsic::get_dynamic_area_offset:
428
0
    errs() << "WARNING: this target does not support the custom llvm.get."
429
0
              "dynamic.area.offset.  It is being lowered to a constant 0\n";
430
0
    // Just lower it to a constant 0 because for most targets
431
0
    // @llvm.get.dynamic.area.offset is lowered to zero.
432
0
    CI->replaceAllUsesWith(ConstantInt::get(CI->getType(), 0));
433
0
    break;
434
0
  case Intrinsic::returnaddress:
435
0
  case Intrinsic::frameaddress:
436
0
    errs() << "WARNING: this target does not support the llvm."
437
0
           << (Callee->getIntrinsicID() == Intrinsic::returnaddress ?
438
0
             
"return"0
:
"frame"0
) << "address intrinsic.\n";
439
0
    CI->replaceAllUsesWith(
440
0
        ConstantPointerNull::get(cast<PointerType>(CI->getType())));
441
0
    break;
442
0
  case Intrinsic::addressofreturnaddress:
443
0
    errs() << "WARNING: this target does not support the "
444
0
              "llvm.addressofreturnaddress intrinsic.\n";
445
0
    CI->replaceAllUsesWith(
446
0
        ConstantPointerNull::get(cast<PointerType>(CI->getType())));
447
0
    break;
448
0
449
0
  case Intrinsic::prefetch:
450
0
    break;    // Simply strip out prefetches on unsupported architectures
451
0
452
0
  case Intrinsic::pcmarker:
453
0
    break;    // Simply strip out pcmarker on unsupported architectures
454
0
  case Intrinsic::readcyclecounter: {
455
0
    errs() << "WARNING: this target does not support the llvm.readcyclecoun"
456
0
           << "ter intrinsic.  It is being lowered to a constant 0\n";
457
0
    CI->replaceAllUsesWith(ConstantInt::get(Type::getInt64Ty(Context), 0));
458
0
    break;
459
0
  }
460
0
461
0
  case Intrinsic::dbg_declare:
462
0
    break;    // Simply strip out debugging intrinsics
463
0
464
0
  case Intrinsic::eh_typeid_for:
465
0
    // Return something different to eh_selector.
466
0
    CI->replaceAllUsesWith(ConstantInt::get(CI->getType(), 1));
467
0
    break;
468
0
469
0
  case Intrinsic::annotation:
470
0
  case Intrinsic::ptr_annotation:
471
0
    // Just drop the annotation, but forward the value
472
0
    CI->replaceAllUsesWith(CI->getOperand(0));
473
0
    break;
474
0
475
0
  case Intrinsic::assume:
476
0
  case Intrinsic::var_annotation:
477
0
    break;   // Strip out these intrinsics
478
0
 
479
0
  case Intrinsic::memcpy: {
480
0
    Type *IntPtr = DL.getIntPtrType(Context);
481
0
    Value *Size = Builder.CreateIntCast(CI->getArgOperand(2), IntPtr,
482
0
                                        /* isSigned */ false);
483
0
    Value *Ops[3];
484
0
    Ops[0] = CI->getArgOperand(0);
485
0
    Ops[1] = CI->getArgOperand(1);
486
0
    Ops[2] = Size;
487
0
    ReplaceCallWith("memcpy", CI, Ops, Ops+3, CI->getArgOperand(0)->getType());
488
0
    break;
489
0
  }
490
0
  case Intrinsic::memmove: {
491
0
    Type *IntPtr = DL.getIntPtrType(Context);
492
0
    Value *Size = Builder.CreateIntCast(CI->getArgOperand(2), IntPtr,
493
0
                                        /* isSigned */ false);
494
0
    Value *Ops[3];
495
0
    Ops[0] = CI->getArgOperand(0);
496
0
    Ops[1] = CI->getArgOperand(1);
497
0
    Ops[2] = Size;
498
0
    ReplaceCallWith("memmove", CI, Ops, Ops+3, CI->getArgOperand(0)->getType());
499
0
    break;
500
0
  }
501
0
  case Intrinsic::memset: {
502
0
    Value *Op0 = CI->getArgOperand(0);
503
0
    Type *IntPtr = DL.getIntPtrType(Op0->getType());
504
0
    Value *Size = Builder.CreateIntCast(CI->getArgOperand(2), IntPtr,
505
0
                                        /* isSigned */ false);
506
0
    Value *Ops[3];
507
0
    Ops[0] = Op0;
508
0
    // Extend the amount to i32.
509
0
    Ops[1] = Builder.CreateIntCast(CI->getArgOperand(1),
510
0
                                   Type::getInt32Ty(Context),
511
0
                                   /* isSigned */ false);
512
0
    Ops[2] = Size;
513
0
    ReplaceCallWith("memset", CI, Ops, Ops+3, CI->getArgOperand(0)->getType());
514
0
    break;
515
0
  }
516
0
  case Intrinsic::sqrt: {
517
0
    ReplaceFPIntrinsicWithCall(CI, "sqrtf", "sqrt", "sqrtl");
518
0
    break;
519
0
  }
520
0
  case Intrinsic::log: {
521
0
    ReplaceFPIntrinsicWithCall(CI, "logf", "log", "logl");
522
0
    break;
523
0
  }
524
0
  case Intrinsic::log2: {
525
0
    ReplaceFPIntrinsicWithCall(CI, "log2f", "log2", "log2l");
526
0
    break;
527
0
  }
528
0
  case Intrinsic::log10: {
529
0
    ReplaceFPIntrinsicWithCall(CI, "log10f", "log10", "log10l");
530
0
    break;
531
0
  }
532
0
  case Intrinsic::exp: {
533
0
    ReplaceFPIntrinsicWithCall(CI, "expf", "exp", "expl");
534
0
    break;
535
0
  }
536
0
  case Intrinsic::exp2: {
537
0
    ReplaceFPIntrinsicWithCall(CI, "exp2f", "exp2", "exp2l");
538
0
    break;
539
0
  }
540
0
  case Intrinsic::pow: {
541
0
    ReplaceFPIntrinsicWithCall(CI, "powf", "pow", "powl");
542
0
    break;
543
0
  }
544
0
  case Intrinsic::sin: {
545
0
    ReplaceFPIntrinsicWithCall(CI, "sinf", "sin", "sinl");
546
0
    break;
547
0
  }
548
0
  case Intrinsic::cos: {
549
0
    ReplaceFPIntrinsicWithCall(CI, "cosf", "cos", "cosl");
550
0
    break;
551
0
  }
552
0
  case Intrinsic::floor: {
553
0
    ReplaceFPIntrinsicWithCall(CI, "floorf", "floor", "floorl");
554
0
    break;
555
0
  }
556
0
  case Intrinsic::ceil: {
557
0
    ReplaceFPIntrinsicWithCall(CI, "ceilf", "ceil", "ceill");
558
0
    break;
559
0
  }
560
0
  case Intrinsic::trunc: {
561
0
    ReplaceFPIntrinsicWithCall(CI, "truncf", "trunc", "truncl");
562
0
    break;
563
0
  }
564
0
  case Intrinsic::round: {
565
0
    ReplaceFPIntrinsicWithCall(CI, "roundf", "round", "roundl");
566
0
    break;
567
0
  }
568
0
  case Intrinsic::copysign: {
569
0
    ReplaceFPIntrinsicWithCall(CI, "copysignf", "copysign", "copysignl");
570
0
    break;
571
0
  }
572
0
  case Intrinsic::flt_rounds:
573
0
     // Lower to "round to the nearest"
574
0
     if (!CI->getType()->isVoidTy())
575
0
       CI->replaceAllUsesWith(ConstantInt::get(CI->getType(), 1));
576
0
     break;
577
0
  case Intrinsic::invariant_start:
578
0
  case Intrinsic::lifetime_start:
579
0
    // Discard region information.
580
0
    CI->replaceAllUsesWith(UndefValue::get(CI->getType()));
581
0
    break;
582
0
  case Intrinsic::invariant_end:
583
0
  case Intrinsic::lifetime_end:
584
0
    // Discard region information.
585
0
    break;
586
0
  }
587
0
588
0
  assert(CI->use_empty() &&
589
0
         "Lowering should have eliminated any uses of the intrinsic call!");
590
0
  CI->eraseFromParent();
591
0
}
592
593
27
bool IntrinsicLowering::LowerToByteSwap(CallInst *CI) {
594
27
  // Verify this is a simple bswap.
595
27
  if (CI->getNumArgOperands() != 1 ||
596
27
      CI->getType() != CI->getArgOperand(0)->getType() ||
597
27
      !CI->getType()->isIntegerTy())
598
0
    return false;
599
27
600
27
  IntegerType *Ty = dyn_cast<IntegerType>(CI->getType());
601
27
  if (!Ty)
602
0
    return false;
603
27
604
27
  // Okay, we can do this xform, do so now.
605
27
  Module *M = CI->getModule();
606
27
  Constant *Int = Intrinsic::getDeclaration(M, Intrinsic::bswap, Ty);
607
27
608
27
  Value *Op = CI->getArgOperand(0);
609
27
  Op = CallInst::Create(Int, Op, CI->getName(), CI);
610
27
611
27
  CI->replaceAllUsesWith(Op);
612
27
  CI->eraseFromParent();
613
27
  return true;
614
27
}