Issue No.08 - August (1994 vol.43)
DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/12.295854
<p>The speed of high-radix digit-recurrence dividers and square-root units is mainly determined by the complexity of the result-digit selection. We present a scheme in which a simpler function speculates the result digit, and, when this speculation is incorrect, a rollback or a partial advance is performed. This results in operations with a shorter cycle time and a variable number of cycles. The scheme can be used in separate division and square-root units, or in a combined one. Several designs were realized and compared in terms of execution time and area. The fastest unit considered is a radix-512 divider with a partial advance of six bits.</p>
digital arithmetic; square-root; high-radix division; digit-recurrence dividers; result digit; speculation; execution time; partial advance; digital arithmetic; digit recurrence; variable-time operation.
J. Cortadella, T. Lang, "High-Radix Division and Square-Root with Speculation", IEEE Transactions on Computers, vol.43, no. 8, pp. 919-931, August 1994, doi:10.1109/12.295854