小编Sam*_*uel的帖子

我试图插入内部cos()函数调用LLVM传递.我在FunctionPass中的代码:

std::vector<Type *> arg_type;
arg_type.push_back(Type::getFloatTy(getGlobalContext()));
Function *fun = Intrinsic::getDeclaration(F.getParent(), Intrinsic::cos, arg_type);
CallInst* callInst = CallInst::Create(fun, args, Twine("cos"), (Instruction *)&I);

当我遗漏最后一行时产生的IR是:

define i32 @main() nounwind uwtable {
entry:
...
}

declare float @llvm.cos.f32(float) nounwind readonly

,但包含CallInst所有我得到的是:

0  opt                0x000000000094f4bf
1  opt                0x000000000094f9c9
2  libpthread.so.0    0x00007fb92b652cb0
3  opt                0x00000000008be244 llvm::Instruction::Instruction(llvm::Type*, unsigned int, llvm::Use*, unsigned int, llvm::Instruction*) + 148
4  LLVMObfuscation.so 0x00007fb92a66c52f
5  LLVMObfuscation.so 0x00007fb92a66c9a5
6  LLVMObfuscation.so 0x00007fb92a66df21
7  opt                0x00000000008e921f llvm::FPPassManager::runOnFunction(llvm::Function&) + 591
8  opt                0x00000000008e9293 llvm::FPPassManager::runOnModule(llvm::Module&) + 51
9  opt                0x00000000008e8f34 …