enbody@ss8.cps.msu.edu (Dr Richard Enbody) (02/06/91)
Michael Slater states |> |> >How many cycles for an integer multiply and divide? |> |> Multiply is half the cycles of an R3000, divide is the same. |> |> >How about the cycle counts for the FP operations? |> |> Mostly the same as for R3000; multiply is 25% faster. Of course, all are |> faster because of higher clock rate. (Note cycle count is based on cycles of |> the 50-MHz external clock, not 100-MHz internal clock, so speedup is by a |> factor of 50/33, not 100/33, comparing to a 33-MHz R3000/3010.) |> |> |> Michael Slater, Editor and Publisher, Microprocessor Report |> mslater@cup.portal.com 707/823-4004 fax: 707/823-0504 I don't know how many cycles are needed for these operations in the R3000. Can anyone fill me in or give them for the R4000? I am curious about how fast multiplication and division have become in absolute terms. For comparison, how many cycles were needed for multiplication and division on a much older chip, e.g. the original IBM PC (weren't they done in software?). Thanks.