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Thread: Çàäà÷êà - ñìÿòàíå íà MIPS
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7th February 2011 23:45 #1
Çàäà÷êà - ñìÿòàíå íà MIPS
Àç ãî ñìÿòàì, ÷å èíñòðóêöèÿòà ñå ñìÿòà çà 7 òàêòà, ~14MIPSQUESTION 3
We have a RISC processor with register-register arithmetic instructions that have the format
R1 <- R2opR3. The pipeline for these instructions runs with a 100 MHz clock with the following
stages: instruction fetch = 2 clocks, instruction decode = 1 clock, fetch operands = 1 clock,
execute = 2 clocks, and store result = 1 clock.
1. At what rate (in MIPS) can we execute register-register instructions that have no data
dependencies with other instructions?
Ñïîðåä åäíî ðåøåíèå å 2 òàêòà -> 50MIPS o.O
Òàáëè÷êàòà çà èçïúëíåíèå å

Òîåñò çà 2 òàêòà ñàìî ùå å ôå÷íàòà èíñòðóêöèÿòà...
Àç ëè áúðêàì, ðåøåíèåòî ëè å ïîãðåøíî?!
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8th February 2011 00:09 #2Registered User
Join Date: Aug:2003
Location: Ñîôèÿ
Posts: 175
Àìè ñïîðåä êàðòèíêàòà, êîÿòî ñè äàë íàèñòèíà ñà 2 òàêòà. Ñàì âèæäàø, ÷å ïúðâèòå äâå èíñòðóêöèè ìèíàâàò çà 9 òàêòà (â ïåò îò êîèòî ðàçëè÷íè ÷àñòè îò äâåòå èíñòðóêöèè ñå èçïúëíÿâàò ïàðàëåëíî, â ñúîòâåòíèòå ÷àñòè íà êîíâåéðà). Ïðîáâàé äà ñè îòãîâîðèø íà âúïðîñà:
- Çà êîëêî òàêòà çàâúðøâàò N èíñòðóêöèè?
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8th February 2011 10:33 #3
Îòãîâîðúò íà çàäà÷àòà å 100 / 2 = 50 MIPS, êàòî (ðåñïåêòèâíî): 100 å ÷åñòîòàòà íà pipeline-à, à 2 å íàé-ãîëÿìîòî êîëè÷åñòâî òàêòîâå, êîåòî ñå áàâè íÿêîé îò ìîäóëèòå. Àêî ïðèìåðíî execute òè áåøå 3 òàêòà, ðåçóëòàòà ùåøå äà å 33.33.. MIPS, àêî âñè÷êè ìîäóëè áÿõà ïî 3 òàêòà - ïàê òîëêîâà
Åòî òàêà ñå ïëîäÿò òå, êàçâàì ñè àç. Ïîä íîñà òè.
"640K îught to be enough for anybody" - Bill Gates, 1981
Òåñòîâå íà áàòåðèè::Machine specs::Fract::AGG::ÍåÑåÑúðäè×îâå÷å::Baileys::blog::YouTube channel
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8th February 2011 12:45 #4
Äà, äà, èçÿñíè ìè ñå ðàáîòàòà. À àêî èçïúëíåíèåòî íà èíñòðóêöèèòå çàâèñè îò ðåçóëòàòà íà ïðåäèøíàòà, â íàñòîÿùèÿ ñëó÷àé ùå ñå ïîëó÷àò 25MIPS çàðàäè òàêòîâåòå, êîèòî ìèíàâàò äîêàòî åäíàòà èíñòðóêöèÿ èç÷àêà ðåçóëòàòà îò ïðåäíàòà.
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8th February 2011 14:42 #5
Òî÷íî çà òîâà ñà èçìèñëèëè êîíâåéðà, çà äà ìîæå äà íå ñå ÷àêàò ïúëíèòå 7 òàêòà çà âñÿêà èíñòðóêöèÿ, à äà ñå çàñòúïâàò îòäåëíèòå íåçàâèñèìè îïåðàöèè. Òðÿáâà äà ãëåäàø îò ïúðâèÿ òàêò çà ïúðâàòà èíñòðóêöèÿ äî ïîñëåäíèÿ çà ïîñëåäíàòà, ñëåä êîåòî äà ïóñíåø áðîÿ èíñòðóêöèè äà êëîíè êúì áåçêðàéíîñò
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