1 //===- LowerMemIntrinsics.cpp ----------------------------------*- C++ -*--===//
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 #include "llvm/Transforms/Utils/LowerMemIntrinsics.h"
11 #include "llvm/Analysis/TargetTransformInfo.h"
12 #include "llvm/IR/IRBuilder.h"
13 #include "llvm/IR/IntrinsicInst.h"
14 #include "llvm/Transforms/Utils/BasicBlockUtils.h"
15 
16 using namespace llvm;
17 
18 static unsigned getLoopOperandSizeInBytes(Type *Type) {
19   if (VectorType *VTy = dyn_cast<VectorType>(Type)) {
20     return VTy->getBitWidth() / 8;
21   }
22 
23   return Type->getPrimitiveSizeInBits() / 8;
24 }
25 
26 void llvm::createMemCpyLoopKnownSize(Instruction *InsertBefore, Value *SrcAddr,
27                                      Value *DstAddr, ConstantInt *CopyLen,
28                                      unsigned SrcAlign, unsigned DestAlign,
29                                      bool SrcIsVolatile, bool DstIsVolatile,
30                                      const TargetTransformInfo &TTI) {
31   // No need to expand zero length copies.
32   if (CopyLen->isZero())
33     return;
34 
35   BasicBlock *PreLoopBB = InsertBefore->getParent();
36   BasicBlock *PostLoopBB = nullptr;
37   Function *ParentFunc = PreLoopBB->getParent();
38   LLVMContext &Ctx = PreLoopBB->getContext();
39 
40   Type *TypeOfCopyLen = CopyLen->getType();
41   Type *LoopOpType =
42       TTI.getMemcpyLoopLoweringType(Ctx, CopyLen, SrcAlign, DestAlign);
43 
44   unsigned LoopOpSize = getLoopOperandSizeInBytes(LoopOpType);
45   uint64_t LoopEndCount = CopyLen->getZExtValue() / LoopOpSize;
46 
47   unsigned SrcAS = cast<PointerType>(SrcAddr->getType())->getAddressSpace();
48   unsigned DstAS = cast<PointerType>(DstAddr->getType())->getAddressSpace();
49 
50   if (LoopEndCount != 0) {
51     // Split
52     PostLoopBB = PreLoopBB->splitBasicBlock(InsertBefore, "memcpy-split");
53     BasicBlock *LoopBB =
54         BasicBlock::Create(Ctx, "load-store-loop", ParentFunc, PostLoopBB);
55     PreLoopBB->getTerminator()->setSuccessor(0, LoopBB);
56 
57     IRBuilder<> PLBuilder(PreLoopBB->getTerminator());
58 
59     // Cast the Src and Dst pointers to pointers to the loop operand type (if
60     // needed).
61     PointerType *SrcOpType = PointerType::get(LoopOpType, SrcAS);
62     PointerType *DstOpType = PointerType::get(LoopOpType, DstAS);
63     if (SrcAddr->getType() != SrcOpType) {
64       SrcAddr = PLBuilder.CreateBitCast(SrcAddr, SrcOpType);
65     }
66     if (DstAddr->getType() != DstOpType) {
67       DstAddr = PLBuilder.CreateBitCast(DstAddr, DstOpType);
68     }
69 
70     IRBuilder<> LoopBuilder(LoopBB);
71     PHINode *LoopIndex = LoopBuilder.CreatePHI(TypeOfCopyLen, 2, "loop-index");
72     LoopIndex->addIncoming(ConstantInt::get(TypeOfCopyLen, 0U), PreLoopBB);
73     // Loop Body
74     Value *SrcGEP =
75         LoopBuilder.CreateInBoundsGEP(LoopOpType, SrcAddr, LoopIndex);
76     Value *Load = LoopBuilder.CreateLoad(SrcGEP, SrcIsVolatile);
77     Value *DstGEP =
78         LoopBuilder.CreateInBoundsGEP(LoopOpType, DstAddr, LoopIndex);
79     LoopBuilder.CreateStore(Load, DstGEP, DstIsVolatile);
80 
81     Value *NewIndex =
82         LoopBuilder.CreateAdd(LoopIndex, ConstantInt::get(TypeOfCopyLen, 1U));
83     LoopIndex->addIncoming(NewIndex, LoopBB);
84 
85     // Create the loop branch condition.
86     Constant *LoopEndCI = ConstantInt::get(TypeOfCopyLen, LoopEndCount);
87     LoopBuilder.CreateCondBr(LoopBuilder.CreateICmpULT(NewIndex, LoopEndCI),
88                              LoopBB, PostLoopBB);
89   }
90 
91   uint64_t BytesCopied = LoopEndCount * LoopOpSize;
92   uint64_t RemainingBytes = CopyLen->getZExtValue() - BytesCopied;
93   if (RemainingBytes) {
94     IRBuilder<> RBuilder(PostLoopBB ? PostLoopBB->getFirstNonPHI()
95                                     : InsertBefore);
96 
97     // Update the alignment based on the copy size used in the loop body.
98     SrcAlign = std::min(SrcAlign, LoopOpSize);
99     DestAlign = std::min(DestAlign, LoopOpSize);
100 
101     SmallVector<Type *, 5> RemainingOps;
102     TTI.getMemcpyLoopResidualLoweringType(RemainingOps, Ctx, RemainingBytes,
103                                           SrcAlign, DestAlign);
104 
105     for (auto OpTy : RemainingOps) {
106       // Calaculate the new index
107       unsigned OperandSize = getLoopOperandSizeInBytes(OpTy);
108       uint64_t GepIndex = BytesCopied / OperandSize;
109       assert(GepIndex * OperandSize == BytesCopied &&
110              "Division should have no Remainder!");
111       // Cast source to operand type and load
112       PointerType *SrcPtrType = PointerType::get(OpTy, SrcAS);
113       Value *CastedSrc = SrcAddr->getType() == SrcPtrType
114                              ? SrcAddr
115                              : RBuilder.CreateBitCast(SrcAddr, SrcPtrType);
116       Value *SrcGEP = RBuilder.CreateInBoundsGEP(
117           OpTy, CastedSrc, ConstantInt::get(TypeOfCopyLen, GepIndex));
118       Value *Load = RBuilder.CreateLoad(SrcGEP, SrcIsVolatile);
119 
120       // Cast destination to operand type and store.
121       PointerType *DstPtrType = PointerType::get(OpTy, DstAS);
122       Value *CastedDst = DstAddr->getType() == DstPtrType
123                              ? DstAddr
124                              : RBuilder.CreateBitCast(DstAddr, DstPtrType);
125       Value *DstGEP = RBuilder.CreateInBoundsGEP(
126           OpTy, CastedDst, ConstantInt::get(TypeOfCopyLen, GepIndex));
127       RBuilder.CreateStore(Load, DstGEP, DstIsVolatile);
128 
129       BytesCopied += OperandSize;
130     }
131   }
132   assert(BytesCopied == CopyLen->getZExtValue() &&
133          "Bytes copied should match size in the call!");
134 }
135 
136 void llvm::createMemCpyLoopUnknownSize(Instruction *InsertBefore,
137                                        Value *SrcAddr, Value *DstAddr,
138                                        Value *CopyLen, unsigned SrcAlign,
139                                        unsigned DestAlign, bool SrcIsVolatile,
140                                        bool DstIsVolatile,
141                                        const TargetTransformInfo &TTI) {
142   BasicBlock *PreLoopBB = InsertBefore->getParent();
143   BasicBlock *PostLoopBB =
144       PreLoopBB->splitBasicBlock(InsertBefore, "post-loop-memcpy-expansion");
145 
146   Function *ParentFunc = PreLoopBB->getParent();
147   LLVMContext &Ctx = PreLoopBB->getContext();
148 
149   Type *LoopOpType =
150       TTI.getMemcpyLoopLoweringType(Ctx, CopyLen, SrcAlign, DestAlign);
151   unsigned LoopOpSize = getLoopOperandSizeInBytes(LoopOpType);
152 
153   IRBuilder<> PLBuilder(PreLoopBB->getTerminator());
154 
155   unsigned SrcAS = cast<PointerType>(SrcAddr->getType())->getAddressSpace();
156   unsigned DstAS = cast<PointerType>(DstAddr->getType())->getAddressSpace();
157   PointerType *SrcOpType = PointerType::get(LoopOpType, SrcAS);
158   PointerType *DstOpType = PointerType::get(LoopOpType, DstAS);
159   if (SrcAddr->getType() != SrcOpType) {
160     SrcAddr = PLBuilder.CreateBitCast(SrcAddr, SrcOpType);
161   }
162   if (DstAddr->getType() != DstOpType) {
163     DstAddr = PLBuilder.CreateBitCast(DstAddr, DstOpType);
164   }
165 
166   // Calculate the loop trip count, and remaining bytes to copy after the loop.
167   Type *CopyLenType = CopyLen->getType();
168   IntegerType *ILengthType = dyn_cast<IntegerType>(CopyLenType);
169   assert(ILengthType &&
170          "expected size argument to memcpy to be an integer type!");
171   Type *Int8Type = Type::getInt8Ty(Ctx);
172   bool LoopOpIsInt8 = LoopOpType == Int8Type;
173   ConstantInt *CILoopOpSize = ConstantInt::get(ILengthType, LoopOpSize);
174   Value *RuntimeLoopCount = LoopOpIsInt8 ?
175                             CopyLen :
176                             PLBuilder.CreateUDiv(CopyLen, CILoopOpSize);
177   BasicBlock *LoopBB =
178       BasicBlock::Create(Ctx, "loop-memcpy-expansion", ParentFunc, PostLoopBB);
179   IRBuilder<> LoopBuilder(LoopBB);
180 
181   PHINode *LoopIndex = LoopBuilder.CreatePHI(CopyLenType, 2, "loop-index");
182   LoopIndex->addIncoming(ConstantInt::get(CopyLenType, 0U), PreLoopBB);
183 
184   Value *SrcGEP = LoopBuilder.CreateInBoundsGEP(LoopOpType, SrcAddr, LoopIndex);
185   Value *Load = LoopBuilder.CreateLoad(SrcGEP, SrcIsVolatile);
186   Value *DstGEP = LoopBuilder.CreateInBoundsGEP(LoopOpType, DstAddr, LoopIndex);
187   LoopBuilder.CreateStore(Load, DstGEP, DstIsVolatile);
188 
189   Value *NewIndex =
190       LoopBuilder.CreateAdd(LoopIndex, ConstantInt::get(CopyLenType, 1U));
191   LoopIndex->addIncoming(NewIndex, LoopBB);
192 
193   if (!LoopOpIsInt8) {
194    // Add in the
195    Value *RuntimeResidual = PLBuilder.CreateURem(CopyLen, CILoopOpSize);
196    Value *RuntimeBytesCopied = PLBuilder.CreateSub(CopyLen, RuntimeResidual);
197 
198     // Loop body for the residual copy.
199     BasicBlock *ResLoopBB = BasicBlock::Create(Ctx, "loop-memcpy-residual",
200                                                PreLoopBB->getParent(),
201                                                PostLoopBB);
202     // Residual loop header.
203     BasicBlock *ResHeaderBB = BasicBlock::Create(
204         Ctx, "loop-memcpy-residual-header", PreLoopBB->getParent(), nullptr);
205 
206     // Need to update the pre-loop basic block to branch to the correct place.
207     // branch to the main loop if the count is non-zero, branch to the residual
208     // loop if the copy size is smaller then 1 iteration of the main loop but
209     // non-zero and finally branch to after the residual loop if the memcpy
210     //  size is zero.
211     ConstantInt *Zero = ConstantInt::get(ILengthType, 0U);
212     PLBuilder.CreateCondBr(PLBuilder.CreateICmpNE(RuntimeLoopCount, Zero),
213                            LoopBB, ResHeaderBB);
214     PreLoopBB->getTerminator()->eraseFromParent();
215 
216     LoopBuilder.CreateCondBr(
217         LoopBuilder.CreateICmpULT(NewIndex, RuntimeLoopCount), LoopBB,
218         ResHeaderBB);
219 
220     // Determine if we need to branch to the residual loop or bypass it.
221     IRBuilder<> RHBuilder(ResHeaderBB);
222     RHBuilder.CreateCondBr(RHBuilder.CreateICmpNE(RuntimeResidual, Zero),
223                            ResLoopBB, PostLoopBB);
224 
225     // Copy the residual with single byte load/store loop.
226     IRBuilder<> ResBuilder(ResLoopBB);
227     PHINode *ResidualIndex =
228         ResBuilder.CreatePHI(CopyLenType, 2, "residual-loop-index");
229     ResidualIndex->addIncoming(Zero, ResHeaderBB);
230 
231     Value *SrcAsInt8 =
232         ResBuilder.CreateBitCast(SrcAddr, PointerType::get(Int8Type, SrcAS));
233     Value *DstAsInt8 =
234         ResBuilder.CreateBitCast(DstAddr, PointerType::get(Int8Type, DstAS));
235     Value *FullOffset = ResBuilder.CreateAdd(RuntimeBytesCopied, ResidualIndex);
236     Value *SrcGEP =
237         ResBuilder.CreateInBoundsGEP(Int8Type, SrcAsInt8, FullOffset);
238     Value *Load = ResBuilder.CreateLoad(SrcGEP, SrcIsVolatile);
239     Value *DstGEP =
240         ResBuilder.CreateInBoundsGEP(Int8Type, DstAsInt8, FullOffset);
241     ResBuilder.CreateStore(Load, DstGEP, DstIsVolatile);
242 
243     Value *ResNewIndex =
244         ResBuilder.CreateAdd(ResidualIndex, ConstantInt::get(CopyLenType, 1U));
245     ResidualIndex->addIncoming(ResNewIndex, ResLoopBB);
246 
247     // Create the loop branch condition.
248     ResBuilder.CreateCondBr(
249         ResBuilder.CreateICmpULT(ResNewIndex, RuntimeResidual), ResLoopBB,
250         PostLoopBB);
251   } else {
252     // In this case the loop operand type was a byte, and there is no need for a
253     // residual loop to copy the remaining memory after the main loop.
254     // We do however need to patch up the control flow by creating the
255     // terminators for the preloop block and the memcpy loop.
256     ConstantInt *Zero = ConstantInt::get(ILengthType, 0U);
257     PLBuilder.CreateCondBr(PLBuilder.CreateICmpNE(RuntimeLoopCount, Zero),
258                            LoopBB, PostLoopBB);
259     PreLoopBB->getTerminator()->eraseFromParent();
260     LoopBuilder.CreateCondBr(
261         LoopBuilder.CreateICmpULT(NewIndex, RuntimeLoopCount), LoopBB,
262         PostLoopBB);
263   }
264 }
265 
266 // Lower memmove to IR. memmove is required to correctly copy overlapping memory
267 // regions; therefore, it has to check the relative positions of the source and
268 // destination pointers and choose the copy direction accordingly.
269 //
270 // The code below is an IR rendition of this C function:
271 //
272 // void* memmove(void* dst, const void* src, size_t n) {
273 //   unsigned char* d = dst;
274 //   const unsigned char* s = src;
275 //   if (s < d) {
276 //     // copy backwards
277 //     while (n--) {
278 //       d[n] = s[n];
279 //     }
280 //   } else {
281 //     // copy forward
282 //     for (size_t i = 0; i < n; ++i) {
283 //       d[i] = s[i];
284 //     }
285 //   }
286 //   return dst;
287 // }
288 static void createMemMoveLoop(Instruction *InsertBefore,
289                               Value *SrcAddr, Value *DstAddr, Value *CopyLen,
290                               unsigned SrcAlign, unsigned DestAlign,
291                               bool SrcIsVolatile, bool DstIsVolatile) {
292   Type *TypeOfCopyLen = CopyLen->getType();
293   BasicBlock *OrigBB = InsertBefore->getParent();
294   Function *F = OrigBB->getParent();
295 
296   // Create the a comparison of src and dst, based on which we jump to either
297   // the forward-copy part of the function (if src >= dst) or the backwards-copy
298   // part (if src < dst).
299   // SplitBlockAndInsertIfThenElse conveniently creates the basic if-then-else
300   // structure. Its block terminators (unconditional branches) are replaced by
301   // the appropriate conditional branches when the loop is built.
302   ICmpInst *PtrCompare = new ICmpInst(InsertBefore, ICmpInst::ICMP_ULT,
303                                       SrcAddr, DstAddr, "compare_src_dst");
304   Instruction *ThenTerm, *ElseTerm;
305   SplitBlockAndInsertIfThenElse(PtrCompare, InsertBefore, &ThenTerm,
306                                 &ElseTerm);
307 
308   // Each part of the function consists of two blocks:
309   //   copy_backwards:        used to skip the loop when n == 0
310   //   copy_backwards_loop:   the actual backwards loop BB
311   //   copy_forward:          used to skip the loop when n == 0
312   //   copy_forward_loop:     the actual forward loop BB
313   BasicBlock *CopyBackwardsBB = ThenTerm->getParent();
314   CopyBackwardsBB->setName("copy_backwards");
315   BasicBlock *CopyForwardBB = ElseTerm->getParent();
316   CopyForwardBB->setName("copy_forward");
317   BasicBlock *ExitBB = InsertBefore->getParent();
318   ExitBB->setName("memmove_done");
319 
320   // Initial comparison of n == 0 that lets us skip the loops altogether. Shared
321   // between both backwards and forward copy clauses.
322   ICmpInst *CompareN =
323       new ICmpInst(OrigBB->getTerminator(), ICmpInst::ICMP_EQ, CopyLen,
324                    ConstantInt::get(TypeOfCopyLen, 0), "compare_n_to_0");
325 
326   // Copying backwards.
327   BasicBlock *LoopBB =
328     BasicBlock::Create(F->getContext(), "copy_backwards_loop", F, CopyForwardBB);
329   IRBuilder<> LoopBuilder(LoopBB);
330   PHINode *LoopPhi = LoopBuilder.CreatePHI(TypeOfCopyLen, 0);
331   Value *IndexPtr = LoopBuilder.CreateSub(
332       LoopPhi, ConstantInt::get(TypeOfCopyLen, 1), "index_ptr");
333   Value *Element = LoopBuilder.CreateLoad(
334       LoopBuilder.CreateInBoundsGEP(SrcAddr, IndexPtr), "element");
335   LoopBuilder.CreateStore(Element,
336                           LoopBuilder.CreateInBoundsGEP(DstAddr, IndexPtr));
337   LoopBuilder.CreateCondBr(
338       LoopBuilder.CreateICmpEQ(IndexPtr, ConstantInt::get(TypeOfCopyLen, 0)),
339       ExitBB, LoopBB);
340   LoopPhi->addIncoming(IndexPtr, LoopBB);
341   LoopPhi->addIncoming(CopyLen, CopyBackwardsBB);
342   BranchInst::Create(ExitBB, LoopBB, CompareN, ThenTerm);
343   ThenTerm->eraseFromParent();
344 
345   // Copying forward.
346   BasicBlock *FwdLoopBB =
347     BasicBlock::Create(F->getContext(), "copy_forward_loop", F, ExitBB);
348   IRBuilder<> FwdLoopBuilder(FwdLoopBB);
349   PHINode *FwdCopyPhi = FwdLoopBuilder.CreatePHI(TypeOfCopyLen, 0, "index_ptr");
350   Value *FwdElement = FwdLoopBuilder.CreateLoad(
351       FwdLoopBuilder.CreateInBoundsGEP(SrcAddr, FwdCopyPhi), "element");
352   FwdLoopBuilder.CreateStore(
353       FwdElement, FwdLoopBuilder.CreateInBoundsGEP(DstAddr, FwdCopyPhi));
354   Value *FwdIndexPtr = FwdLoopBuilder.CreateAdd(
355       FwdCopyPhi, ConstantInt::get(TypeOfCopyLen, 1), "index_increment");
356   FwdLoopBuilder.CreateCondBr(FwdLoopBuilder.CreateICmpEQ(FwdIndexPtr, CopyLen),
357                               ExitBB, FwdLoopBB);
358   FwdCopyPhi->addIncoming(FwdIndexPtr, FwdLoopBB);
359   FwdCopyPhi->addIncoming(ConstantInt::get(TypeOfCopyLen, 0), CopyForwardBB);
360 
361   BranchInst::Create(ExitBB, FwdLoopBB, CompareN, ElseTerm);
362   ElseTerm->eraseFromParent();
363 }
364 
365 static void createMemSetLoop(Instruction *InsertBefore,
366                              Value *DstAddr, Value *CopyLen, Value *SetValue,
367                              unsigned Align, bool IsVolatile) {
368   Type *TypeOfCopyLen = CopyLen->getType();
369   BasicBlock *OrigBB = InsertBefore->getParent();
370   Function *F = OrigBB->getParent();
371   BasicBlock *NewBB =
372       OrigBB->splitBasicBlock(InsertBefore, "split");
373   BasicBlock *LoopBB
374     = BasicBlock::Create(F->getContext(), "loadstoreloop", F, NewBB);
375 
376   IRBuilder<> Builder(OrigBB->getTerminator());
377 
378   // Cast pointer to the type of value getting stored
379   unsigned dstAS = cast<PointerType>(DstAddr->getType())->getAddressSpace();
380   DstAddr = Builder.CreateBitCast(DstAddr,
381                                   PointerType::get(SetValue->getType(), dstAS));
382 
383   Builder.CreateCondBr(
384       Builder.CreateICmpEQ(ConstantInt::get(TypeOfCopyLen, 0), CopyLen), NewBB,
385       LoopBB);
386   OrigBB->getTerminator()->eraseFromParent();
387 
388   IRBuilder<> LoopBuilder(LoopBB);
389   PHINode *LoopIndex = LoopBuilder.CreatePHI(TypeOfCopyLen, 0);
390   LoopIndex->addIncoming(ConstantInt::get(TypeOfCopyLen, 0), OrigBB);
391 
392   LoopBuilder.CreateStore(
393       SetValue,
394       LoopBuilder.CreateInBoundsGEP(SetValue->getType(), DstAddr, LoopIndex),
395       IsVolatile);
396 
397   Value *NewIndex =
398       LoopBuilder.CreateAdd(LoopIndex, ConstantInt::get(TypeOfCopyLen, 1));
399   LoopIndex->addIncoming(NewIndex, LoopBB);
400 
401   LoopBuilder.CreateCondBr(LoopBuilder.CreateICmpULT(NewIndex, CopyLen), LoopBB,
402                            NewBB);
403 }
404 
405 void llvm::expandMemCpyAsLoop(MemCpyInst *Memcpy,
406                               const TargetTransformInfo &TTI) {
407   if (ConstantInt *CI = dyn_cast<ConstantInt>(Memcpy->getLength())) {
408     createMemCpyLoopKnownSize(/* InsertBefore */ Memcpy,
409                               /* SrcAddr */ Memcpy->getRawSource(),
410                               /* DstAddr */ Memcpy->getRawDest(),
411                               /* CopyLen */ CI,
412                               /* SrcAlign */ Memcpy->getSourceAlignment(),
413                               /* DestAlign */ Memcpy->getDestAlignment(),
414                               /* SrcIsVolatile */ Memcpy->isVolatile(),
415                               /* DstIsVolatile */ Memcpy->isVolatile(),
416                               /* TargetTransformInfo */ TTI);
417   } else {
418     createMemCpyLoopUnknownSize(/* InsertBefore */ Memcpy,
419                                 /* SrcAddr */ Memcpy->getRawSource(),
420                                 /* DstAddr */ Memcpy->getRawDest(),
421                                 /* CopyLen */ Memcpy->getLength(),
422                                 /* SrcAlign */ Memcpy->getSourceAlignment(),
423                                 /* DestAlign */ Memcpy->getDestAlignment(),
424                                 /* SrcIsVolatile */ Memcpy->isVolatile(),
425                                 /* DstIsVolatile */ Memcpy->isVolatile(),
426                                 /* TargetTransfomrInfo */ TTI);
427   }
428 }
429 
430 void llvm::expandMemMoveAsLoop(MemMoveInst *Memmove) {
431   createMemMoveLoop(/* InsertBefore */ Memmove,
432                     /* SrcAddr */ Memmove->getRawSource(),
433                     /* DstAddr */ Memmove->getRawDest(),
434                     /* CopyLen */ Memmove->getLength(),
435                     /* SrcAlign */ Memmove->getSourceAlignment(),
436                     /* DestAlign */ Memmove->getDestAlignment(),
437                     /* SrcIsVolatile */ Memmove->isVolatile(),
438                     /* DstIsVolatile */ Memmove->isVolatile());
439 }
440 
441 void llvm::expandMemSetAsLoop(MemSetInst *Memset) {
442   createMemSetLoop(/* InsertBefore */ Memset,
443                    /* DstAddr */ Memset->getRawDest(),
444                    /* CopyLen */ Memset->getLength(),
445                    /* SetValue */ Memset->getValue(),
446                    /* Alignment */ Memset->getDestAlignment(),
447                    Memset->isVolatile());
448 }
449