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Politics : Formerly About Advanced Micro Devices

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To: Time Traveler who wrote (24092)	10/7/1997 1:07:00 AM
From: Petz	of 1573048

RE: square root in 5 clock cycles, JYW, you forgot that computers use powers of 2 not powers of 10! 2.0 = 0.5 * 2*2 Initial estimate of manissa = (0.5+1)/2= 0.75 (did I have sign wrong?) Expopnent = 2/2 = 1 Thus my initial estimate is 1.5, which is about 6% too high Because of some other details, like making sure the exponent is even before dividing by two, the initial estimate may be computed more quickly by a table lookup, as you'll see in my second post. I said, "Obviously you've never done microcode for floating point functions, huh" No, but how about yourself?* Yes, for two years in my last job, I programmed microcode (320 bits wide) for an array processor. BTW, it used AMD FPU chips and took five clock cycles to do a square root! (Back in those days, clock speed was only 10 MHz.) Petz

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