Instruction pipelining

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Topic: Instruction pipelining

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instruction set
million instructions per second
instruction pipeline
instruction set architectures
Instructional Design
very long instruction word
instruction pointer
Reduced Instruction Set Computer



Instruction pipeline - Wikipedia, the free encyclopedia

An instruction pipeline is a technique used in the design of microprocessors and other digital electronic devices to increase their performance.
The LOAD instruction is executed, while the MOVE instruction is fetched from memory.
When more than one instruction references a particular location for an operand, either reading it (as an input) or writing it (as an output), executing those instructions in an order different from the original program order can lead to problems, also known as hazards.

http://en.wikipedia.org/wiki/Instruction_pipeline (1371 words)



Lecture 3: Pipelining and Instruction-Level Parallelism

This is where data needed by one instruction is produced by a previous instruction, or where data needed by one instruction flows through a chain of dependent instructions from some source.
This happens when an instruction in the pipeline depends on data from another instruction that is also in the pipeline.
Pipelines work because many instructions executing sequentially are doing independent tasks that can be done in parallel.

http://camino.rutgers.edu/cs505/lecture3.html (2109 words)



p

In computers, a pipeline is the continuous and somewhat overlapped movement of instruction to the processor or in the arithmetic steps taken by the processor to perform an instruction.
With pipelining, the computer architecture allows the next instructions to be fetched while the processor is performing arithmetic operations, holding them in a buffer close to the processor until each instruction operation can be performed.
Pipelining is a technique that exploits parallelism among the instructions in a sequential instruction stream.

http://www.nvc.cs.vt.edu/~cegyhazy/cs4014/Chapter8.html (7514 words)



Instruction level parallelism - Wikipedia, the free encyclopedia

Instruction-level parallelism (ILP) is a measure of how many of the operations in a computer program can be performed simultaneously.
Due to the complexity of scaling the last two techniques, the industry has re-examined instruction sets which explicitly encode multiple operations per instruction.
VLIW and the closely related Explicitly Parallel Instruction Computing concepts

http://en.wikipedia.org/wiki/Instruction_level_parallelism (353 words)



Instruction Pipelining

Pipelines for arithmetic processing often are extended to two-dimensional structures in which input data comes from several other stages and output may be passed to more than one destination.
In this method, the instruction set is designed so that after a conditional branch instruction, the next instruction in sequence is always executed, and then the branch is taken.
If the present instruction is a conditional branch, the next instruction may not be known until the current one is processed.

http://www.csee.wvu.edu/~jdm/classes/cs455/notes/tech/instrpipe.html (1735 words)



Articles - Central processing unit

Instruction level parallelism (ILP) seeks to increase the rate at which instructions are executed within a CPU (that is, to increase the utilization of on-die execution resources), and thread level parallelism (TLP) purposes to increase the number of threads (effectively individual programs) that a CPU can execute simultaneously.
After an instruction is fetched, the PC is incremented by the length of the instruction word in terms of memory units.
Often the instruction to be fetched must be retrieved from relatively slow memory, causing the CPU to stall while waiting for the instruction to be returned.

http://www.seekj.com/articles/Central_processing_unit (4964 words)



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If the instruction is not a branch instruction but an arithmetic instruction, send it to the proper ALU.
Intel's strategy of deepening the Pentium 4's pipeline, a practice that Intel calls "hyperpipelining", has paid off in terms of performance, but it is not without its drawbacks.
An instruction starts out in the fetch phase, moves to the decode phase, then to the execute phase, and finally to the write phase.

http://arstechnica.com/articles/paedia/cpu/pipelining-1.ars/1 (626 words)



2.1.1 -Instruction pipelining

Instruction pipelines depend on being able to fetch instructions in advance.
Instruction execution The processor executes the instruction on the values.
This is relatively straightforward until a branch instruction is encountered.

http://www.epcc.ed.ac.uk/epic/optimisation/notes/optimisation.book_16.html (315 words)



Instruction pipelining

Instruction pipelining is a method for increasing the of a digital circuit particularly a CPU and implements a form of instruction level parallelism.
This of problem is called a data dependency In order to resolve these conflicts even logic must be added to stall or deal with the incoming data.
A significant of the effort in modern CPU design goes into resolving these sorts of

http://www.freeglossary.com/Instruction_pipelining (476 words)



DIGITAL Fortran 90

The software pipelining optimization applies instruction scheduling to certain innermost loops, allowing instructions within a loop to "wrap around" and execute in a different iteration of the loop.
By modifying the unrolled loop and inserting instructions as needed before and/or after the unrolled loop, software pipelining generally improves run-time performance, except where the loops contain a large number of instructions with many existing overlapped operations.
Speculative execution evaluates conditional code (including exceptions) and moves instructions that would otherwise be executed conditionally to a position before the test, so they are executed unconditionally.

http://www.helsinki.fi/atk/unix/dec_manuals/df90au52/dfum021.htm (1964 words)



Chapter 6

Instructions and data generally move from left to right except for the write back stage, which places the result back into the register file, and selection of next PC value.
Sometimes an instruction depends on the results of a previous instruction still in the pipeline.
The only instruction that reads data memory is a load.

http://www.mines.edu/~crader/cs341/Chapter6.htm (1887 words)



Pipelining

Those principles apply to more complex instruction sets than DLX, although the resulting pipelines are more complex.
The throughput of the instruction pipeline is determined by how often an instruction exits the pipeline.
If the stages are perfectly balanced, then the time per instruction on the pipelined machine is equal to

http://www.cs.iastate.edu/~prabhu/Tutorial/PIPELINE/pipe_title.html (223 words)



Toggit Certification Home for MCSE CCNA A+ study guides and test prep

In processor architecture, a method of fetching and decoding instructions that ensures that the processor never needs to wait; as soon as one instruction is executed, the next one is ready.
The Pentium represents the continuing evolution of the 80486 family of microprocessors and adds several notable features, including instruction code and data caches and a built-in floating-point processor and memory management unit.
The Intel Pentium processor features two pipelines, one for data and one for instructions, and can process two instructions per clock cycle.

http://www.toggit.com/Library/pedia/techno.asp?Term=p&Techno=Letter (9535 words)



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# The message: 74% of instructions executed are data movement and control, so optimize what is done most, rarely used complex tasks comprising the main tasks # RISC does this optimization by exploiting a 32 bit architecture and the use of highly parallel execution (pipelined) of a more primitive (simpler instruction set.
Example: while an instruction is doing arithmetic using registers, the memory is idle...
# RISC architecture uses simpler (but longer) instructions, favors functions which are most heavily used, uses parallelism in the execution of instruction, and avoids microprogramming.

http://www.cs.binghamton.edu/~guydosh/cs325/risc-arch1.doc (1146 words)



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Forwarding is passing data from one instruction to instructions that need the data before it is written into the register file.
Flush the instruction at IF Let instructions at ID (the branch), EX, and MEM move to their next stages
the instruction at IF is combined with that for branch instructions

http://class.ee.iastate.edu/cpre305/exams/guide-final.htm (1462 words)



Contemporary Computer Architecture - Part-Time Programs in Engineering and Applied Science

Topics include memory system design, instruction and arithmetic pipelining, reduced instruction set versus complex instruction set architectures, and storage systems.

http://www.apl.jhu.edu/Courses/cs/605.711Martino.html (375 words)



RISC - 12

instruction and data caches are on the processor chip
instruction fetching is optimized since word-length units are fetched
Maximum number of uses of memory management unit for a data address in an instruction is 1.

http://www.ship.edu/~jcthom/schedule/architecture/stallings/ch12.html (2218 words)



EEC280

Those issues range from efficient instruction set design, pipelining, advanced pipelining and super-scalar computer implementation, exploitation of instruction level parallelism, memory hierarchy and multiprocessing.
This course consists of lectures dealing with topics and issues in architecture and design of complex and high-performance computer systems.
Thos issues are foundation of modern computer architecture and design.

http://www.ece.ucdavis.edu/~vojin/CLASSES/EEC270/W2002/Course_Descrp.htm (908 words)



Instruction Pipelining

or we can execution instructions in a pipeline...

http://www-ee.eng.hawaii.edu/~tep/EE461/Notes/Pipeline/pipe1.html (30 words)



A Chronology of Digital Computing Machines (to 1952)

The machine also implements a form of instruction pipelining, with the program tape being read 2 instructions ahead and various optimiz- ations performed automatically.
But it can also cache some instructions in memory and read them from there; thus, in effect, it can operate either as a stored-program computer (with a very small program memory) or not.
The total memory capacity is 4,000 instructions, 350 16-bit words in the main data drums, and 4,000 words more in the secondary memory.

http://www.davros.org/misc/chronology.html (8186 words)



Body

RISC Instruction Pipelining Example: One possible break down of instruction execution.
data hazard - an instruction depends on the results of a previous instruction which has not been calculated yet.
Pipelined Execution - goal is to complete one instruction per clock cycle

http://www.cs.uni.edu/~fienup/cs240f03/lectures/lec20_10-30-03.htm (599 words)



CSE 420

Students are assessed on their ability to analyze and solve problems dealing with RISC computer architecture, instruction set, pipelining, advanced pipelining, cache and virtual memory design, and I/O systems.
To understand the principles of instruction set design.
2.1 Students will study in detail the encoding of instructions in a recent instruction set architecture.

http://www.eas.asu.edu/~csedept/courses/syllabi/syl420.html (472 words)



EECC-551 Winter 1998 Home Page

Techniques to enhance performance such as pipelined execution optimizations, branch-handling, exploiting instruction-level parallelism, multiple-instruction issue and dynamic scheduling are studied.
Dynamic Instruction Pipeline Scheduling: The Scoreboard, The Tomasulo Approach.
Week 5: Dynamic Instruction Scheduling: The Scoreboard Approach, The Tomasulo Approach.

http://www.rit.edu/~meseec/eecc551-winter98 (270 words)



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We need to keep in mind that other instructions are using the stages not in use by our lw instruction!¡&´¤ª,BZ óD(óE)óF'óB%óC&óG*¨A Bug!¨ When the value read from memory is written back to the register file, the inputs to the register file (write register #) are from a different instruction!
To fix the bug we need to save the part of the lw instruction (5 bits of it specify which register should get the value from memory).¡&!ÊUªÊTóH+¨ New Datapathªª óI,¨Pipeline Control System¨æWe need to build a new control system for a pipelined datapath.
It's impossible to test all possible combinations of instructions (to make sure the hardware does what is expected).

http://www.cs.rpi.edu/~hollingd/comporg.2000/Notes/Pipeline.ppt (677 words)



SCRIPT-O Quiz Maker

SSE uses ___________________which is the ability to start processing a new instruction while still processing and older instruction. .
This allows a single instruction set to manipulate multiple data items at one time it is referred to as_______________________________________.
The Intel slot 1 processors were the first to incorporate the __________on board the processing unit

http://www.readingmatrix.com/cgi-bin/instructors/main.cgi?State=show_quiz&mode=1&filename=O8QiQIQOO8lCl8lIl1lCO8Q0QIl1O8ljl8lqliO8Qlljl8QIQoQIO8QOlil1lolmlglQlql1QoQOlmQjOglIl8lqO8ljQoQoQ0lol8lIQIO8lmlgQIQoQOQilIQol8QOQIO8lol1Qol1O8omoIoioOoiiOoQO8I1I1I0IjIOImIjIlI0IlOgQ1Qn (310 words)



instruction set architecture definition of instruction set architecture in computing dictionary - by the Free Online ...

instruction set architecture - (ISA) The parts of a processor's design that need to be understood in order to write assembly language, such as the machine language instructions and registers.
instruction set architecture definition of instruction set architecture in computing dictionary - by the Free Online Dictionary, Thesaurus and Encyclopedia.
Parts of the architecture that are left to the implementation, such as number of superscalar functional units, cache size and cycle speed, are not part of the ISA.

http://computing-dictionary.thefreedictionary.com/instruction+set+architecture (144 words)



In-Stat - Microprocessors for Professionals Webinar

It starts with the basics and covers such topics as microprocessor architectures, pipelining, superscalar execution, branch prediction, caches, semiconductor manufacturing, performance factors, the microprocessor's role in system-level designs, and how the evolution of technology is creating new business models.
A deeper knowledge of microprocessors is vital for anyone who needs to evaluate technology, perform competitive analysis, communicate with clients, and understand the latest developments.
Microprocessors for Professionals is an exciting new Web-based seminar for marketing managers, public relations specialists, financial analysts, venture capitalists, executives, attorneys, journalists, and others who need a plain-talk crash course on microprocessor technology.

http://www.instat.com/micropro/print.htm (121 words)



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Is CPI = 1 for our pipeline?Recall: Compute CPI?.Improving Instruction Level Parallelism (ILP)& Can we somehow make CPI closer to 1? FP Loop: Where are the Hazards?FP Loop Showing Stalls"Revised FP Loop Minimizing Stalls-Unroll Loop Four Times (straightforward way)$Unrolled Loop That Minimizes Stalls5Getting CPI

http://zippy.sonoma.edu/~gsims/cs_410/pipeIII.ppt (346 words)



Using Graphics and Animation to Visulize Instruction Pipelining and its Hazards (Per Stenström, Håkan Nilsson, Jonas ...

Using Graphics and Animation to Visulize Instruction Pipelining and its Hazards (Per Stenström, Håkan Nilsson, Jonas Skeppstedt) - Electronic Research Archive (Conference Paper) - Blekinge Institute of Technology (BTH) - Computer Science,
Using Graphics and Animation to Visulize Instruction Pipelining and its Hazards
Address: Blekinge Institute of Technology, SE-371 79 Karlskrona, Sweden

http://www.bth.se/fou/forskinfo.nsf/alfs/90ac4c24e85a4b84c12568a3002cab5a (90 words)



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http://www.cs.purdue.edu/homes/li/cs250/Lectures/L14.ppt (93 words)



Instruction Pipelining

Just like laundry, we can break instruction execution up into separate stages:

http://www-ee.eng.hawaii.edu/~tep/EE461/Notes/Pipeline/pipe.html (12 words)



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http://www.mcs.drexel.edu/~jjohnson/wi02/cs282/lectures/lec3.ppt (359 words)

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