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Scheduling delay slots

Scheduling Branch Delay Slots sub or sub or Y He EE A from EE A at California State University Los Angeles. Understanding stalls and branch delay slots. The processor has two delay slots and the two (but dependencies can prevent the compiler from scheduling any. Which instruction(s) in the assembly sequences below would you place in the delay slot(s), (A) ADD R5 Delay Slots LW R

Scheduling Branch Delay Slots

If both paths join--as is common for if-then-else constructs--, then delay slots could potentially be filled from the join point; but such instructions are usually dependent on instructions from at least one of the paths before the join, which dependency would prevent them from being used in delay slots. Using instructions from the target or fall-through path of a conditional branch must generally preserve exception behavior. If it is not conflicting , then we can place those instructions. The current practice for allocating ATFM delays does not take into account if flights have any remaining schedule buffer to absorb ATFM delay and reduce delay propagation to subsequent flights. Recommended articles Citing articles 0. For the taken path, one useless instruction and one no-op are executed, wasting two cycles.

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Delay slot

This site uses cookies to deliver our services and to show you relevant ads and job listings. By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. Join Stack Overflow to learn, share knowledge, and build your career. Here Delay slot is 2. But I did not get what is the Branch Condition? Is it Jump to X???

If it is , then how to place 2 instruction in the delay slot? Because to place instruction from "Before" Or " Target " or "Fall Through" , we need to compare them with Branch condition. If it is not conflicting , then we can place those instructions. Not getting meaning of J X Ans: ADD and OR instructions.

If yes , then we can't use SUB instruction because value of R7 will change. ADD also cant be used as R5 will change. For A , J X is an unconditional jump to a single fixed label presumably within the range provided by the ISA , so it does not have any data dependencies on previous instructions. Since the ADD has a name dependence on the result of the OR , if it is to be moved after the OR the destination of the OR would have to be changed assuming there is a free register available and that a later move can either be free in terms of scheduling or eliminated by changing the instructions that later use this value in R3 to use the register used as the destination for the OR.

This would be a relatively complex change and is probably excluded from consideration. The unconditional nature of the jump also means that there is no fall-through path; the jump is always taken.

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This site uses cookies to deliver our services and to show you relevant ads and job listings. By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service.

Join Stack Overflow to learn, share knowledge, and build your career. I am taking a course on Computer Architecture. I found this website from another University which has notes and videos which are helping me thus far: CS, Univ of Utah.

I am working through some old homework assignments posted on that site, in particular this one. I am trying to understand pipelining and related concepts, specifically stalls and branch delay slots. I am looking now at the first question from that old homework assignment and am unsure of how to do these problems.

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Consider a stage in-order processor, where the instruction is fetched in the first stage, and the branch outcome is known after three stages.

Every branch is predicted not-taken and the mis-fetched instructions are squashed if the branch is taken. The processor has two delay slots and the two instructions following the branch are always fetched and executed, and. You are able to move one note: I am unsure of how to even begin to look at this question.

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This site uses cookies to deliver our services and to show you relevant ads and job listings. By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. In Windows 10, on the performance tab, under memory in task manager, it says "Slots used: I was wondering if this is reliable. Searching my laptop online suggests that it only has one slot.

Is it worth buying an extra stick of RAM or should I open it up first to check? Without knowing the specific model of laptop that you have, this is not possible to answer authoritatively. If you want an authoritative answer, please edit your question to mention the specific make and model laptop that you have. This includes the number of memory slots on the motherboard and the hardware installed in those slots.

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So yes, if the BIOS isn't outright lying, the data shown should be reliable. It seems quite possible that your laptop has one memory module soldered to the motherboard, and one expansion slot available for expansion. This would show up as two slots to software querying for memory hardware data, but only one of those would be available for you to use or not as you please, so might be listed online as "one memory slot, one slot available" or similar.

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You can however get pretty close by looking at the vendor's specifications for the model that you have. By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service , privacy policy and cookie policy , and that your continued use of the website is subject to these policies.

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