Hello everybody, I have some issues in the communication between the compile and runtime. What I am doing is to locate an "add" instruction in the IR and then, after the "add" I insert some new instructions. Then I save the instructions in a vector (in the example the the "add", the "or" and the "xor"). The instrumentation part is working so far. In the runtime, I want to select every specific time one instruction from the vector I created in the compile time before, during the instrumentation. Specifically, I want to select the original "add", or the "or" or the "xor" and pass it in the "store" instruction. However, I cannot pass the new value form the runtime to select which instruction from the vector to be stored. I try to do this in through the counterStop function. call void @counterStop() %8 = load i32* %x, align 4, %9 = add nsw i32 %8, 2 %10 = shl i32 1, 2 %11 = or i32 %8, %10 %15 = shl i32 1, 2 %16 = xor i32 %8, %15 store i32 %9, i32* %x, align 4 ... Any ideas how to change the value in the vector through the runtime? regards, Vasileios