Author: Danniel Corbit
Date: 09:40:07 09/28/98
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On September 28, 1998 at 09:17:09, Robert Hyatt wrote: >On September 28, [snip] Dann: >>For thousands or millions of lines of C, >>an equivalent ASM is very hard to produce for Risc machines. > >I'll take that bet. :) > >Remember: RISC == Really Invented by Seymour Cray. The cray has been >RISC from day one. (Classic definition is one load/one store instruction, >everything operates on registers). If someone writes an optimizer for a >processor, I *guarantee* you that I can write code better, because *every* >optimizer has concessions. They are very good, no doubt, but *not* as good >as someone that understands the architecture in fine detail... That's why >the scientific labs have folks that do nothing but take existing code and >hand-code assembly replacements to make them run faster. This was Harry's >job at livermore lab from the time they got their first Cray-1... Probably depends on the chip. Consider a sparc. 256 registers. Do you imagine that a person can really track those better than a machine over millions of invocations and context switches?
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