Methods for supporting extended precision integer divide macroinstructions in a processor
A method for an extended precision integer divide algorithm includes separating an L-bit integer dividend into two equal width integer format portions, a first portion including lower M bits of the integer dividend and a second portion including upper M bits of the integer dividend, where M is equal to ½ L. An N-bit wide integer divisor is converted from an integer format into a floating point format divisor. The first integer portion is converted into a floating point format and divided by the floating point format divisor to obtain a first floating point quotient, which is converted into a first integer format quotient. The second integer portion is converted into a floating point format and divided by the floating point format divisor to obtain a second floating point quotient which is also converted to a second integer format quotient. Then first and second integer format quotients are summed together to generate a third integer format quotient.
Intel Corporation
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additional inventional
Rajesh S. Patrice L.
Parthasarathy Roussel