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Add strncpy libcall creator. Use it when it should be used.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98219 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -39,6 +39,11 @@ namespace llvm {
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Value *EmitStrCpy(Value *Dst, Value *Src, IRBuilder<> &B,
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const TargetData *TD);
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/// EmitStrNCpy - Emit a call to the strncpy function to the builder, for the
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/// specified pointer arguments and length.
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Value *EmitStrNCpy(Value *Dst, Value *Src, Value *Len, IRBuilder<> &B,
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const TargetData *TD);
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/// EmitMemCpy - Emit a call to the memcpy function to the builder. This
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/// always expects that the size has type 'intptr_t' and Dst/Src are pointers.
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Value *EmitMemCpy(Value *Dst, Value *Src, Value *Len,
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@ -850,7 +850,8 @@ Instruction *InstCombiner::tryOptimizeCall(CallInst *CI, const TargetData *TD) {
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return 0;
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if (SizeCI->isAllOnesValue() ||
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SizeCI->getZExtValue() <= SizeArg->getZExtValue()) {
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Value *Ret = EmitStrCpy(CI->getOperand(1), CI->getOperand(2), B, TD);
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Value *Ret = EmitStrNCpy(CI->getOperand(1), CI->getOperand(2),
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CI->getOperand(3), B, TD);
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return ReplaceInstUsesWith(*CI, Ret);
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}
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return 0;
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@ -87,6 +87,26 @@ Value *llvm::EmitStrCpy(Value *Dst, Value *Src, IRBuilder<> &B,
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return CI;
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}
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/// EmitStrNCpy - Emit a call to the strcpy function to the builder, for the
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/// specified pointer arguments.
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Value *llvm::EmitStrNCpy(Value *Dst, Value *Src, Value *Len,
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IRBuilder<> &B, const TargetData *TD) {
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Module *M = B.GetInsertBlock()->getParent()->getParent();
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AttributeWithIndex AWI[2];
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AWI[0] = AttributeWithIndex::get(2, Attribute::NoCapture);
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AWI[1] = AttributeWithIndex::get(~0u, Attribute::NoUnwind);
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const Type *I8Ptr = B.getInt8PtrTy();
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Value *StrNCpy = M->getOrInsertFunction("strncpy", AttrListPtr::get(AWI, 2),
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I8Ptr, I8Ptr, I8Ptr,
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Len->getType(), NULL);
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CallInst *CI = B.CreateCall3(StrNCpy, CastToCStr(Dst, B), CastToCStr(Src, B),
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Len, "strncpy");
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if (const Function *F = dyn_cast<Function>(StrNCpy->stripPointerCasts()))
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CI->setCallingConv(F->getCallingConv());
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return CI;
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}
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/// EmitMemCpy - Emit a call to the memcpy function to the builder. This always
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/// expects that the size has type 'intptr_t' and Dst/Src are pointers.
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Value *llvm::EmitMemCpy(Value *Dst, Value *Src, Value *Len,
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