I want to copy these set of instructions from one part and paste to that in another part in IR
%0 = load i32, i32* @x, align 4
%1 = load i32, i32* @y, align 4
%add = add nsw i32 %0, %1
%2 = load i32, i32* @n, align 4
%cmp = icmp slt i32 %add, %2
%conv = zext i1 %cmp to i32
Assuming you are using C++ API, you will just have to clone each instruction separately while fixing references between them. Something like the following:
llvm::ValueToValueMapTy vmap;
for (auto *inst: instructions_to_clone) {
auto *new_inst = inst->clone();
new_inst->insertBefore(insertion_pos);
vmap[inst] = new_inst;
llvm::RemapInstruction(new_inst, vmap,
RF_NoModuleLevelChanges | RF_IgnoreMissingLocals);
}