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RightShift

# RightShift - Notice the 1-bit in the Test Mask is at index...

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Right Shift Algorithm Original Data X 1 5 X 1 4 X 1 3 X 1 2 X 1 1 X 1 0 X 9 X 8 X 7 X 6 X 5 X 4 X 3 X 2 X 1 X 0 Shifted Data 0 X 1 5 X 1 4 X 1 3 X 1 2 X 1 1 X 1 0 X 9 X 8 X 7 X 6 X 5 X 4 X 3 X 2 X 1 ==================================== Algorithm Test Mask 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 Original Data X 1 5 X 1 4 X 1 3 X 1 2 X 1 1 X 1 0 X 9 X 8 X 7 X 6 X 5 X 4 X 3 X 2 X 1 X 0 Shifted Data 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Set Mask 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 The Original Data is given in R0. The algorithm builds the Shifted Data in R1 (or any other register) The Test Mask is used to test a single bit of the Original Data at a time The Set Mask is used to set a single bit of the Shifted Data at a time Initialization : Clear the Shifted Data register and initialize the two masks as shown.

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Unformatted text preview: Notice the 1-bit in the Test Mask is at index 1 higher than the 1-bit in the Set Mask. Why? Repeat the following the required number of times : Test a bit of the Original Data using the Test Mask. If the tested bit is 1, set the next lower bit of the Shifted Data by adding the Set Mask. Perform a left-shift on both test Mask and Set Mask....
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