x=x+1 vs. x +=1

Question

I\'m under the impression that these two commands result in the same end, namely incrementing X by 1 but that the latter is probably more efficient.

If this is not c

Answer 1

So many speculations! Even the conclusion with the Reflector thingy is not necessarily true because it can do optimizations while dissassembling.

So why does none of you guys just have a look into the IL code? Have a look at the following C# programme:

static void Main(string[] args)
{
    int x = 2;
    int y = 3;
    x += 1;
    y = y + 1;
    Console.WriteLine(x);
    Console.WriteLine(y);
}

This code snippet compiles to:

.method private hidebysig static void Main(string[] args) cil managed
{
.entrypoint
// Code size 25 (0x19)
.maxstack 2
.locals init ([0] int32 x,
[1] int32 y)
// some commands omitted here

IL_0004: ldloc.0
IL_0005: ldc.i4.1
IL_0006: add
IL_0007: stloc.0

IL_0008: ldloc.1
IL_0009: ldc.i4.1
IL_000a: add
IL_000b: stloc.1

// some commands omitted here
}

As you can see, it's in fact absolutely the same. And why is it? Because IL's purpose is to tell what to do, not how to. The optimization will be a job of the JIT compiler. Btw it's the same in VB.Net