ShiftLeft vs multiply in .Net

    Converting 2 bytes to a UINT16

Which is fastest? multiply or shiftLeft

       Dim a As Byte = 3

        Dim b As Byte = 7

        Dim c As UInt16

        For i = 0 To 100000

            'c = a + b * 256

            c = a + (CInt(b) << 8)

        Next

Multiply wins, 10 % faster.

NB!

ShiftLeft << isn't calculated first so you need the () around 

Shift left a byte, need to convert it to a uINT16 first.

 

c=1795

if you calc it 

c=b<<8 +3 = 56

c=a+ b<<8 = 10

c=cint(b)<<8+3 = 14336

c=a+cint(b)<<8 = 2560

c=a+(cint(b) <<8) =1795 

So I will stay away from ShiftLeft/Right !