rt，有类似以下的常量（至少3个map嵌套）

static std::unordered_map<std::string, std::function<llvm::Value *(llvm::IRBuilder<> &, llvm::Value *, llvm::Value *)>> opMapTemplate = {
            {"", [](llvm::IRBuilder<> &builder, llvm::Value *v1, llvm::Value *v2) { return v2; }},
            {"+", [](llvm::IRBuilder<> &builder, llvm::Value *v1, llvm::Value *v2) { return builder.CreateAdd(v1, v2, "AddV"); }},
            {"-", [](llvm::IRBuilder<> &builder, llvm::Value *v1, llvm::Value *v2) { return builder.CreateSub(v1, v2, "SubV"); }},
            {"*", [](llvm::IRBuilder<> &builder, llvm::Value *v1, llvm::Value *v2) { return builder.CreateMul(v1, v2, "MulV"); }},
            {"/", [](llvm::IRBuilder<> &builder, llvm::Value *v1, llvm::Value *v2) { return builder.CreateFDiv(v1, v2, "DivV"); }},
            {"%", [](llvm::IRBuilder<> &builder, llvm::Value *v1, llvm::Value *v2) { return builder.CreateSRem(v1, v2, "ModV"); }},
            {"<<", [](llvm::IRBuilder<> &builder, llvm::Value *v1, llvm::Value *v2) { return builder.CreateShl(v1, v2, "ShlV"); }},
            {">>", [](llvm::IRBuilder<> &builder, llvm::Value *v1, llvm::Value *v2) { return builder.CreateAShr(v1, v2, "AShrV"); }},
            {">>>", [](llvm::IRBuilder<> &builder, llvm::Value *v1, llvm::Value *v2) { return builder.CreateLShr(v1, v2, "LShrV"); }},
            {"^", [](llvm::IRBuilder<> &builder, llvm::Value *v1, llvm::Value *v2) { return builder.CreateXor(v1, v2, "XorV"); }},
            {"&", [](llvm::IRBuilder<> &builder, llvm::Value *v1, llvm::Value *v2) { return builder.CreateAnd(v1, v2, "AndV"); }},
            {"&&", [](llvm::IRBuilder<> &builder, llvm::Value *v1, llvm::Value *v2) { return builder.CreateAnd(v1, v2, "LAndV"); }},
            {"|", [](llvm::IRBuilder<> &builder, llvm::Value *v1, llvm::Value *v2) { return builder.CreateOr(v1, v2, "OrV"); }},
            {"||", [](llvm::IRBuilder<> &builder, llvm::Value *v1, llvm::Value *v2) { return builder.CreateOr(v1, v2, "LOrV"); }},
            {">", [](llvm::IRBuilder<> &builder, llvm::Value *v1, llvm::Value *v2) { return builder.CreateICmpSGT(v1, v2, "cmpV"); }},
            {">=", [](llvm::IRBuilder<> &builder, llvm::Value *v1, llvm::Value *v2) { return builder.CreateICmpSGE(v1, v2, "cmpV"); }},
            {"<", [](llvm::IRBuilder<> &builder, llvm::Value *v1, llvm::Value *v2) { return builder.CreateICmpSLT(v1, v2, "cmpV"); }},
            {"<=", [](llvm::IRBuilder<> &builder, llvm::Value *v1, llvm::Value *v2) { return builder.CreateICmpSLE(v1, v2, "cmpV"); }},
            {"!=", [](llvm::IRBuilder<> &builder, llvm::Value *v1, llvm::Value *v2) {
                 if(v1->getType()->isFloatTy() || v1->getType()->isDoubleTy())
                     return builder.CreateFCmpUNE(v1, v2, "fne");
                 else
                     return builder.CreateICmpNE(v1, v2, "ne");
             }}};