Maths: shift4Left

       Name: shift4Left                                              [Show more]
       Type: Variable
   Category: Maths
    Summary: Lookup table for shifting a byte four places to the left, to
             extract the low nibble
  Deep dive: Times tables and nibble arithmetic
    Context: See this variable in context in the source code
 References: This variable is used as follows:
             * DivideScaled uses shift4Left
             * Multiply4x16 uses shift4Left
             * Multiply8x8 uses shift4Left
             * ScaleUp uses shift4Left


 In the table below, shift4Left,X contains the low byte of X * 16. So if X is
 %XXXXxxxx, shift4Left,X contains %xxxx0000.


.shift4Left

 FOR I%, 0, 255

  EQUB LO(I% * 16)

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