[.NET MSIL - HELP] Rebuilding Pointer-Based Instructions

Question

Hi all! Hope it's not a problem if I ask something about IL instructions in a forum about .NET languages, but I really need some help fixing a problem.

I'm trying to reverse those instructions...

ldloc.s texturedRef
conv.i
ldloc.s num11
ldloc.1
mul
ldloc.s num12
add
conv.i
sizeof [Microsoft.DirectX.Direct3D]Microsoft.DirectX.Direct3D.CustomVertex/TransformedColoredTextured
mul
add
conv.u
stloc.s texturedPtr

My best try is:

CustomVertex.TransformedColoredTextured* texturedPtr = (CustomVertex.TransformedColoredTextured*)((byte)(texturedRef + ((k * num2) + m)));

Buy I obviously get something like that:

ldloc.s texturedRef
conv.i
ldloc.s num11
ldloc.1
mul
ldloc.s num12
add
conv.i
sizeof [Microsoft.DirectX.Direct3D]Microsoft.DirectX.Direct3D.CustomVertex/TransformedColoredTextured
mul
add
conv.u4 <--------------- Difference
conv.u
stloc.s texturedPtr

If I compile this line removing the (byte) boxing:

CustomVertex.TransformedColoredTextured* texturedPtr = (CustomVertex.TransformedColoredTextured*)(texturedRef + ((k * num2) + m));

I get those instructions (without final conv):

ldloc.s texturedRef
conv.i
ldloc.s num11
ldloc.1
mul
ldloc.s num12
add
conv.i
sizeof [Microsoft.DirectX.Direct3D]Microsoft.DirectX.Direct3D.CustomVertex/TransformedColoredTextured
mul
add
stloc.s texturedPtr

Those differences are making texture rendering process very very slow because I can't get a stand alone "conv.u". Any ideas anyone?

Thanks in advance!