On 7/27/07, Joe Nathan <[EMAIL PROTECTED]> wrote: > It does in single operation, but it taks twices clock pulse than 32bit! > You cannot perform binary adder operation in parallel. Speed of operation > is measured with the number of clock pulse. 32bit adder may require > something like 36 clock pulses or close numbers. 64bit require about 70 > clock > pulses. Remember that cpu logic gates work in sync with clocks. > Limited number of operations can be performed in a second. The > number will change depending on your cpu clock pulse, which > is limited to about 3.5GHz these days. That's why we want more Hz > to get speed. That's the thing that give us the speed!
That is wrong. Integer addition *is* done in parallel by any normal CPU. Here's a description of one type of logic circuit to do that: http://en.wikipedia.org/wiki/Carry_look-ahead_adder The computer I'm using to type this takes one clock cycle to add a pair of integers that are in registers, whether they're 64, 32, 16 or 8 bits wide. Reference: "Software Optimization Guide for AMD Family 10h Processors", Appendix C http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/40546.pdf -- Len --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
