1 //===-- IntrinsicLowering.cpp - Intrinsic Lowering default implementation -===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the default intrinsic lowering implementation.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/CodeGen/IntrinsicLowering.h"
15 #include "llvm/Constants.h"
16 #include "llvm/DerivedTypes.h"
17 #include "llvm/Module.h"
18 #include "llvm/Instructions.h"
23 template <class ArgIt>
24 static Function *EnsureFunctionExists(Module &M, const char *Name,
25 ArgIt ArgBegin, ArgIt ArgEnd,
27 if (Function *F = M.getNamedFunction(Name)) return F;
28 // It doesn't already exist in the program, insert a new definition now.
29 std::vector<const Type *> ParamTys;
30 for (ArgIt I = ArgBegin; I != ArgEnd; ++I)
31 ParamTys.push_back(I->getType());
32 return M.getOrInsertFunction(Name, FunctionType::get(RetTy, ParamTys, false));
35 /// ReplaceCallWith - This function is used when we want to lower an intrinsic
36 /// call to a call of an external function. This handles hard cases such as
37 /// when there was already a prototype for the external function, and if that
38 /// prototype doesn't match the arguments we expect to pass in.
39 template <class ArgIt>
40 static CallInst *ReplaceCallWith(const char *NewFn, CallInst *CI,
41 ArgIt ArgBegin, ArgIt ArgEnd,
42 const Type *RetTy, Function *&FCache) {
44 // If we haven't already looked up this function, check to see if the
45 // program already contains a function with this name.
46 Module *M = CI->getParent()->getParent()->getParent();
47 FCache = M->getNamedFunction(NewFn);
49 // It doesn't already exist in the program, insert a new definition now.
50 std::vector<const Type *> ParamTys;
51 for (ArgIt I = ArgBegin; I != ArgEnd; ++I)
52 ParamTys.push_back((*I)->getType());
53 FCache = M->getOrInsertFunction(NewFn,
54 FunctionType::get(RetTy, ParamTys, false));
58 const FunctionType *FT = FCache->getFunctionType();
59 std::vector<Value*> Operands;
61 for (ArgIt I = ArgBegin; I != ArgEnd && ArgNo != FT->getNumParams();
64 if (Arg->getType() != FT->getParamType(ArgNo))
65 Arg = new CastInst(Arg, FT->getParamType(ArgNo), Arg->getName(), CI);
66 Operands.push_back(Arg);
68 // Pass nulls into any additional arguments...
69 for (; ArgNo != FT->getNumParams(); ++ArgNo)
70 Operands.push_back(Constant::getNullValue(FT->getParamType(ArgNo)));
72 std::string Name = CI->getName(); CI->setName("");
73 if (FT->getReturnType() == Type::VoidTy) Name.clear();
74 CallInst *NewCI = new CallInst(FCache, Operands, Name, CI);
75 if (!CI->use_empty()) {
77 if (CI->getType() != NewCI->getType())
78 V = new CastInst(NewCI, CI->getType(), Name, CI);
79 CI->replaceAllUsesWith(V);
84 void DefaultIntrinsicLowering::AddPrototypes(Module &M) {
85 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
86 if (I->isExternal() && !I->use_empty())
87 switch (I->getIntrinsicID()) {
89 case Intrinsic::setjmp:
90 EnsureFunctionExists(M, "setjmp", I->arg_begin(), I->arg_end(), Type::IntTy);
92 case Intrinsic::longjmp:
93 EnsureFunctionExists(M, "longjmp", I->arg_begin(), I->arg_end(),Type::VoidTy);
95 case Intrinsic::siglongjmp:
96 EnsureFunctionExists(M, "abort", I->arg_end(), I->arg_end(), Type::VoidTy);
98 case Intrinsic::memcpy:
99 EnsureFunctionExists(M, "memcpy", I->arg_begin(), --I->arg_end(),
100 I->arg_begin()->getType());
102 case Intrinsic::memmove:
103 EnsureFunctionExists(M, "memmove", I->arg_begin(), --I->arg_end(),
104 I->arg_begin()->getType());
106 case Intrinsic::memset:
107 EnsureFunctionExists(M, "memset", I->arg_begin(), --I->arg_end(),
108 I->arg_begin()->getType());
110 case Intrinsic::isunordered:
111 EnsureFunctionExists(M, "isunordered", I->arg_begin(), I->arg_end(), Type::BoolTy);
113 case Intrinsic::sqrt:
114 if(I->arg_begin()->getType() == Type::FloatTy)
115 EnsureFunctionExists(M, "sqrtf", I->arg_begin(), I->arg_end(), Type::FloatTy);
117 EnsureFunctionExists(M, "sqrt", I->arg_begin(), I->arg_end(), Type::DoubleTy);
122 void DefaultIntrinsicLowering::LowerIntrinsicCall(CallInst *CI) {
123 Function *Callee = CI->getCalledFunction();
124 assert(Callee && "Cannot lower an indirect call!");
126 switch (Callee->getIntrinsicID()) {
127 case Intrinsic::not_intrinsic:
128 std::cerr << "Cannot lower a call to a non-intrinsic function '"
129 << Callee->getName() << "'!\n";
132 std::cerr << "Error: Code generator does not support intrinsic function '"
133 << Callee->getName() << "'!\n";
136 // The setjmp/longjmp intrinsics should only exist in the code if it was
137 // never optimized (ie, right out of the CFE), or if it has been hacked on
138 // by the lowerinvoke pass. In both cases, the right thing to do is to
139 // convert the call to an explicit setjmp or longjmp call.
140 case Intrinsic::setjmp: {
141 static Function *SetjmpFCache = 0;
142 Value *V = ReplaceCallWith("setjmp", CI, CI->op_begin()+1, CI->op_end(),
143 Type::IntTy, SetjmpFCache);
144 if (CI->getType() != Type::VoidTy)
145 CI->replaceAllUsesWith(V);
148 case Intrinsic::sigsetjmp:
149 if (CI->getType() != Type::VoidTy)
150 CI->replaceAllUsesWith(Constant::getNullValue(CI->getType()));
153 case Intrinsic::longjmp: {
154 static Function *LongjmpFCache = 0;
155 ReplaceCallWith("longjmp", CI, CI->op_begin()+1, CI->op_end(),
156 Type::VoidTy, LongjmpFCache);
160 case Intrinsic::siglongjmp: {
161 // Insert the call to abort
162 static Function *AbortFCache = 0;
163 ReplaceCallWith("abort", CI, CI->op_end(), CI->op_end(), Type::VoidTy,
168 case Intrinsic::returnaddress:
169 case Intrinsic::frameaddress:
170 std::cerr << "WARNING: this target does not support the llvm."
171 << (Callee->getIntrinsicID() == Intrinsic::returnaddress ?
172 "return" : "frame") << "address intrinsic.\n";
173 CI->replaceAllUsesWith(ConstantPointerNull::get(
174 cast<PointerType>(CI->getType())));
177 case Intrinsic::prefetch:
178 break; // Simply strip out prefetches on unsupported architectures
180 case Intrinsic::pcmarker:
181 break; // Simply strip out pcmarker on unsupported architectures
183 case Intrinsic::dbg_stoppoint:
184 case Intrinsic::dbg_region_start:
185 case Intrinsic::dbg_region_end:
186 case Intrinsic::dbg_declare:
187 case Intrinsic::dbg_func_start:
188 if (CI->getType() != Type::VoidTy)
189 CI->replaceAllUsesWith(Constant::getNullValue(CI->getType()));
190 break; // Simply strip out debugging intrinsics
192 case Intrinsic::memcpy: {
193 // The memcpy intrinsic take an extra alignment argument that the memcpy
194 // libc function does not.
195 static Function *MemcpyFCache = 0;
196 ReplaceCallWith("memcpy", CI, CI->op_begin()+1, CI->op_end()-1,
197 (*(CI->op_begin()+1))->getType(), MemcpyFCache);
200 case Intrinsic::memmove: {
201 // The memmove intrinsic take an extra alignment argument that the memmove
202 // libc function does not.
203 static Function *MemmoveFCache = 0;
204 ReplaceCallWith("memmove", CI, CI->op_begin()+1, CI->op_end()-1,
205 (*(CI->op_begin()+1))->getType(), MemmoveFCache);
208 case Intrinsic::memset: {
209 // The memset intrinsic take an extra alignment argument that the memset
210 // libc function does not.
211 static Function *MemsetFCache = 0;
212 ReplaceCallWith("memset", CI, CI->op_begin()+1, CI->op_end()-1,
213 (*(CI->op_begin()+1))->getType(), MemsetFCache);
216 case Intrinsic::isunordered: {
217 Value *L = CI->getOperand(1);
218 Value *R = CI->getOperand(2);
220 Value *LIsNan = new SetCondInst(Instruction::SetNE, L, L, "LIsNan", CI);
221 Value *RIsNan = new SetCondInst(Instruction::SetNE, R, R, "RIsNan", CI);
222 CI->replaceAllUsesWith(
223 BinaryOperator::create(Instruction::Or, LIsNan, RIsNan,
227 case Intrinsic::sqrt: {
228 static Function *sqrtFCache = 0;
229 static Function *sqrtfFCache = 0;
230 if(CI->getType() == Type::FloatTy)
231 ReplaceCallWith("sqrtf", CI, CI->op_begin()+1, CI->op_end(),
232 Type::FloatTy, sqrtfFCache);
234 ReplaceCallWith("sqrt", CI, CI->op_begin()+1, CI->op_end(),
235 Type::DoubleTy, sqrtFCache);
240 assert(CI->use_empty() &&
241 "Lowering should have eliminated any uses of the intrinsic call!");
242 CI->getParent()->getInstList().erase(CI);