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Technology Stocks : CYRIX / NSM

NSM 18.27

0.0%

Jul 31 5:00 PM EST

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To: Joe NYC who wrote (28358)	7/17/1998 5:16:00 PM
From: Steve Porter	Read Replies (1) of 33344

Joe, Aren't integer and FPU independent of each other? For example, if you issue a floating point instruction, and a bunch of integer instructions following it. I knew this would happen ;-) The reason that happens is that I over simplified the example to get the point across. Integer and Floating point instructions come from the same instruction stream. If there are enough fp instructions in the stream it will stall the integer unit.... as I said in my notes after the example CPUs will do some reordering on their own, but ONLY so far into the instruction stream. If the compiler had a good knowledge of the Cyrix or AMD chips it would ensure that the mix was better tuned.. I believe I said I would need several hundred instruction to show it in real life.. but that's not the point.. FP instructions _can_ and _do_ starve the integer unit if the number of FP instructions in a line is long enough.. . The only time the CPU would stall is when the CPU needs the result of the floating point operation and it is not ready. This will cause stalls too, but I left this out for the sake on simplicity. Steve

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