c# ILGenerator nop?

Question

Im generating some IL with the ILGenerator here is my code:

DynamicMethod method = new DynamicMethod("test", null, Type.EmptyTypes);
ILGenerator gen = method.GetILGenerator();
gen.Emit(OpCodes.Ldarg_0);
gen.Emit(OpCodes.Ldarg_1);
gen.Emit(OpCodes.Ldc_I4_S, 100);

This generated this IL:

IL_0000:  ldarg.0    
IL_0001:  ldarg.1    
IL_0002:  ldc.i4.s   100
IL_0004:  nop        
IL_0005:  nop        
IL_0006:  nop

(I get the IL Code from a VS Virtulizer named ILStream)

From where do the nops code? is there any way to get rid of them? Im trying to imitate some c# code and it doesn't have 3 nops.

Answer 1

Compile in release mode to get rid of the nop opcodes.

Answer 2

I solved the problem by casting the int to a value:

Code:

private static bool IsBetween(int value, int min, int max)
{
    return (value >= min && value <= max);
}

private static void WriteInt(ILGenerator gen, int value)
{
    gen.Emit(OpCodes.Ldarg_1);
    if (IsBetween(value, sbyte.MinValue, sbyte.MaxValue))
    {
        gen.Emit(OpCodes.Ldc_I4_S, (sbyte)value);
    }
    else if (IsBetween(value, byte.MinValue, byte.MaxValue))
    {
        gen.Emit(OpCodes.Ldc_I4_S, (byte)value);
    }
    else if (IsBetween(value, short.MinValue, short.MaxValue))
    {
        gen.Emit(OpCodes.Ldc_I4_S, (short)value);
    }
    else
    {
        gen.Emit(OpCodes.Ldc_I4_S, value);
    }
}