Image Superscalarpipeline.svg thumb 300px right Simple superscalar pipeline. By fetching and dispatching ... board cray 2 hg.jpg thumb Processor board of a Cray T3E CRAY T3e supercomputer with four superscalar Alpha 21164 processors A superscalar Central processing unit CPU architecture implements a form ... allows faster CPU throughput than would otherwise be possible at a given clock rate . A superscalar ... unit , a bit shifter, or a Multiplication ALU multiplier . In the Flynn taxonomy Flynn Taxonomy , a superscalar ... a superscalar CPU is typically also instruction pipeline pipeline d, pipelining and superscalar architecture are considered different performance enhancement techniques. The superscalar technique is traditionally ... superscalar design. The Intel i960 CA 1988 and the AMD 29000 series 29050 1990 microprocessors were the first commercial single chip superscalar microprocessors. RISC CPUs like these brought the superscalar ... are superscalar. The P5 microarchitecture P5 Pentium brand Pentium was the first superscalar x86 processor ... execution on a superscalar microarchitecture this opened up for dynamic scheduling of buffered partial ... scalar to superscalar The simplest processors are scalar processor s. Each instruction executed by a scalar ... between Scalar mathematics scalar and vector arithmetic. A superscalar processor is sort of a mixture .... Superscalar CPU design emphasizes improving the instruction dispatcher accuracy, and allowing ... when the number of units increased. While early superscalar CPUs would have two Arithmetic logic ... fed with instructions, the performance of the system will suffer. A superscalar processor usually ... . But merely processing multiple instructions concurrently does not make an architecture superscalar ... also achieve that, but with different methods. In a superscalar CPU the dispatcher reads instructions ... units contained inside a single CPU. Therefore a superscalar processor can be envisioned having ... instruction thread. Limitations Available performance improvement from superscalar techniques is limited ... more details
Unreferenced date December 2009 Orphan date November 2006 A shelving buffer is a technique used in computer processors to increase the efficiency of superscalar processors. Background A Superscalar processor allows the execution of a number of instructions simultaneously in the core of the processor itself, although this behavior is not to be confused with a multi processor system. Most modern processors are superscalar. Problems with Data Dependencies Executing instructions in parallel i.e. simultaneously raises problems with data dependencies, meaning that some instructions may be dependent on the results of others, and hence care must be taken to execute in the correct order. Take for example these sequence of instructions r1 r2 r3 br r7 r1 r4 We have a RAW Read After Write data dependency here, meaning that we must wait for instruction 1 to finish before executing instruction 2, as we require the correct value of r1 register 1 . Hence these instruction cannot be executed simultaneously. How it works? With a superscalar processor, the instruction window of the processor fills up with a number of instructions known as the issue rate . Depending on the scheme that the superscalar processor uses to dispatch these instruction from the window to the execution core of the CPU, we may encounter problems if there is a dependency not unlike the one shown above. Consider an instruction window 3 instructions wide, containing i1, i2, i3 instructions 1,2 & 3 . Suppose that i2 is dependent on an instruction that has not yet finished executing, and we cannot execute it yet. Without the use of a shelving buffer, the superscalar processor will execute i1, wait until i2 can be executed and then execute i2 and i3 simultaneously. However with the use of a shelving buffer, the instruction window will be emptied into shelving buffers regardless of contents. The processor will then search for an appropriate number of instructions in the shelving buffers that can be executed in parallel ... more details
Memory Level Parallelism or MLP is a term in computer architecture referring to the ability to have pending multiple memory operations, in particular cache misses or translation lookaside buffer misses, at the same time. In a single processor, MLP may be considered a form of ILP, instruction level parallelism . However, ILP is often mixed up with superscalar , the ability to execute more than one instruction at the same time. E.g. a processor such as the Intel Pentium Pro is five way superscalar, with the ability to start executing five different microinstructions in a given cycle, but it can handle four different cache misses for up to 20 different load microinstructions at any time. It is possible to have a machine that is not superscalar but which nevertheless has high MLP. Arguably a machine that has no ILP, which is not superscalar, which executes one instruction at a time in a non pipelined manner, but which performs hardware prefetching not software instruction level prefetching exhibits MLP due to multiple prefetches outstanding but not ILP. This is because there are multiple memory operations outstanding, but not instructions . Instructions are often mixed up with operations. Furthermore, multiprocessor and multithreaded computer systems may be said to exhibit MLP and ILP due to parallelism but not intra thread, single process, ILP and MLP. Often, however, we restrict the terms MLP and ILP to refer to extracting such parallelism from what appears to be non parallel single threaded code. References Enhancing memory level parallelism via recovery free value prediction. H. Zhou and T. M. Conte. Proceedings of the 17th Annual International Conference on Supercomputing, ICS 2003. A Case for MLP Aware Cache Replacement , Moinuddin K. Qureshi, Daniel N. Lynch, Onur Mutlu, Yale N. Patt. Proceedings of the 33rd annual International Symposium on Computer Architecture ISCA , 2006. MLP Aware Runahead Threads n a Simultaneous Multithreading Processor . Craeynest, K. Va ... more details
Otherpeople William Johnson Other persons Michael Johnson Michael Johnson disambiguation Michael Johnson BLP unsourced date May 2010 Dr. William Michael Mike Johnson is a technologist, and pioneer in superscalar microprocessor design. Johnson joined AMD in 1985 as the chief architect of the 29K family of microprocessors, and held various management and leadership positions on the 29K , AMD K5 K5 and AMD K7 K7 processor teams. He was vice president of the Advanced Architecture Labs, responsible for technology development in the areas of processor, multimedia, networking, telecommunications, and personal computer system products. Most recently he was VP of the AMD Personal Connectivity Division. Currently he heads Texas Instrument s Austin Microprocessor Design Centre. Prior to his AMD career, Johnson was an architect and designer of early RISC processors at IBM Austin. Johnson holds bachelor s and master s degrees in electrical engineering, both from Arizona State University . He also holds a Ph.D. in electrical engineering from Stanford University . Johnson wrote a seminal work on microprocessor superscalar architecture . Selected works Mike Johnson, Superscalar Microprocessor Design , Prentice Hall, 1991, ISBN 0 13 875634 1 Persondata Metadata see Wikipedia Persondata . NAME Johnson, Mike ALTERNATIVE NAMES SHORT DESCRIPTION DATE OF BIRTH PLACE OF BIRTH DATE OF DEATH PLACE OF DEATH DEFAULTSORT Johnson, Mike Category Stanford University alumni Category American computer scientists Category Living people Category Year of birth missing living people ... more details
Unreferenced stub auto yes date December 2009 Scalar processors represent the simplest class of computer processor s. A scalar processor processes one data item at a time typical data items being integer computer science integer s or floating point number s . In a vector processor , by contrast, a single instruction operates simultaneously on multiple data items. The difference is analogous to the difference between scalar mathematics scalar and Vector geometric vector arithmetic. See also Instruction pipeline Parallel computing Superscalar Compu hardware stub DEFAULTSORT Scalar Processor Category Central processing unit de Skalarprozessor es Procesador escalar fr Processeur scalaire ko id Prosesor skalar mk ja pl Procesor skalarny ru uk ... more details
orphan date September 2010 The HITAC S 3000 is a family of Vector processor vector supercomputer s developed, manufactured and marketed by Hitachi . Announced in the early 1990s, the family succeeded the HITAC S 820 . The S 3000 family comprised the low end and mid range S 3600 models and the high end S 3800 models. Unlike Hitachi s previous generations of supercomputers, the S 3000 family was marketed outside Japan. The S 3600 was an improved version of the S 820 implemented in more modern semiconductor technology. The S 3800 was a new design, differing significantly from the previous generations. It was a parallel vector processor and supported one to four vector processors. In 1994, the S 3000 family was complemented by a MPP machine that used superscalar microprocessors, the SR2001. Hitachi eventually discontinued development of vector supercomputers in favor of this approach. The S 3000 family was replaced in 2000 by the SR8000, making it the last vector supercomputer from Hitachi. Category Supercomputers super compu stub ... more details
renaming, speculative execution AMD K6 Superscalar, branch prediction AMD K6 III Branch prediction ... AMD K10 Superscalar, out of order execution, 32 way set associative L3 victim cache, 32 byte instruction ... Cortex A9 Out of order, speculative issue, superscalar ARM Cortex A15 Multicore up to 16 AVR32 AP7 ... www.pcguide.com ref cpu fam g4C5x86 c.html ref Branch prediction Cyrix 6x86 Superscalar, superpipelined ... 21064 Superscalar Alpha 21364 EV7 Alpha 21364 Superscalar design with out of order execution, branch prediction, 4 way SMT, integrated memory controller Alpha 21464 EV8 Alpha 21464 Superscalar design with out of order execution P5 microarchitecture P5 Pentium 5 Superscalar P6 microarchitecture P6 Pentium Pro 14 Speculative execution, Register renaming, superscalar design with out of order execution ... e300 4 Superscalar, Branch prediction PowerPC e500 Dual 7 stage Multicore PowerPC e600 3 issue 7 stage Superscalar out of order execution, branch prediction PowerPC e5500 4 issue 7 stage Out of order ... 600 PowerPC 603q PowerPC 603q 5 In order PowerPC 600 PowerPC 604 PowerPC 604 6 Superscalar, out ... execution SMP support. PWRficient Superscalar, out of order execution, 6 execution units R4000 8 ... SH2A 5 Superscalar, Harvard architecture UltraSPARC 9 UltraSPARC T1 6 Open source, multithreading ... VIA C7 In order execution VIA Nano Isaiah Superscalar out of order execution, branch prediction, 7 ... more details
Infobox CPU name ARM Cortex A8 image image size caption produced start produced end slowest fastest slow unit fast unit fsb slowest fsb fastest fsb slow unit fsb fast unit size from size to soldby designfirm ARM Holdings manuf1 TSMC core1 pack1 brand1 arch ARMv7 microarch cpuid code numcores 1 l1cache 32 KB 32 KB l2cache l3cache application The ARM Cortex A8 is a processor core designed by ARM Holdings implementing the ARM architecture ARM v7 instruction set architecture . Compared to the ARM11 core, the Cortex A8 is dual issue superscalar, achieving roughly twice the instructions per cycle instructions executed per clock cycle . Features Key features of the Cortex A8 core are Frequency from 600 MHz to 1 GHz and above Superscalar dual issue microarchitecture ARM architecture Advanced SIMD NEON NEON SIMD instruction set extension optional VFPv3 Floating Point Unit optional Thumb 2 instruction set encoding Jazelle RCT Advanced branch prediction unit with 95 accuracy Integrated level 2 Cache 0 4 MB 2.0 DMIPS MHz Implementations Several system on a chip system on chips SoC have implemented the Cortex A8 core, including Apple A4 Snapdragon System on Chip Qualcomm Snapdragon Texas Instruments OMAP OMAP3 TI OMAP3 Hummingbird Processor Samsung Hummingbird See also ARM Holdings ARM architecture ARM Cortex A9 MPCore ARM Cortex A15 MPCore Computer on module References reflist External links http www.arm.com products processors cortex a cortex a8.php ARM Cortex A8 ARM Processor Category ARM architecture ... more details
Unreferenced date December 2009 In computing , an instruction register is the part of a Central processing unit CPU s control unit that stores the instruction currently being executed or decoded. In simple processors each instruction to be executed is loaded into the instruction register which holds it while it is decoded, prepared and ultimately executed, which can take several steps. More complicated processors use a instruction pipeline pipeline of instruction registers where each stage of the pipeline does part of the decoding, preparation or execution and then passes it to the next stage for its step. Modern processors can even do some of the steps of out of order as decoding on several instructions is done in parallel. Decoding the opcode in the instruction register includes determining the instruction, determining where its operands are in memory, retrieving the operands from memory, allocating processor resources to execute the command in superscalar processors , etc. DEFAULTSORT Instruction Register Category Digital registers Compu hardware stub ar es Registro de instrucci n fa ja pl Wska nik instrukcji ... more details
design. Superscalar In a more modern context, the complex variable length encoding used by some of the typical CISC architectures makes it complicated, but still feasible, to build a superscalar implementation of a CISC programming model directly the in order superscalar Intel P5 Original Pentium and the out of order superscalar Cyrix 6x86 are well known examples of this. The frequent ... s for embedded system s, and similar uses. The superscalar complexity in the case of modern ... superscalar execution the Pentium Pro and AMD K5 are early examples of this. This allows a fairly simple superscalar design to be located after the fairly complex decoders and buffers , giving, so to speak ... P5 Pentium brand Pentium generation was a superscalar version of these principles. However, modern ... more details
Infobox CPU name ARM Cortex A15 MPCore image image size caption produced start produced end slowest 1000 MHz fastest 2500 MHz slow unit fast unit fsb slowest fsb fastest fsb slow unit fsb fast unit hypertransport slowest hypertransport fastest hypertransport slow unit hypertransport fast unit size from 45 nanometer 45 nm size to soldby designfirm ARM manuf1 core1 sock1 pack1 brand1 arch ARMv7 microarch cpuid code numcores 1 4 l1cache 64 kB 32 kB I Cache, 32 kB D Cache l2cache l3cache application The ARM Cortex A15 MPCore is a multicore processor providing out of order execution out of order superscalar pipeline ARM architecture ARM v7 instruction set architecture running at up to 2.5 GHz. ref http www.arm.com products processors cortex a cortex a15.php ARM Cortex A15 ARM Processor ref Features Key features of the Cortex A15 core are out of order execution Out of order speculative execution speculative issue superscalar execution pipeline, providing up to 5 times the performance of Cortex A9 MPCore . ARM confirmed that the Cortex A15 core is 40 per cent faster than the Cortex A9 core, all things equal. ref http www.itproportal.com 2011 03 14 exclusive arm cortex a15 40 cent faster cortex a9 Exclusive ARM Cortex A15 40 Per Cent Faster Than Cortex A9 ref DSP and ARM architecture Advanced SIMD NEON NEON SIMD extensions onboard. VFPv4 Floating Point Unit onboard. 64 bit Large Physical Address Extensions LPAE addressing up to 1TB of RAM 1TB needs 40bits . Hardware virtualization support. Thumb 2 instruction set encoding reduces the size of programs with little impact on performance. ARM architecture Security Extensions TrustZone TrustZone security extensions. Jazelle DBX support for Java execution. Jazelle RCT for JIT complilation. Integrated low latency level 2 cache controller, up to 4MB. Program Trace Macrocell and CoreSight Design Kit for unobtrusive tracing of instruction execution. See also ARM Holdings ARM architecture ARM Cortex A8 ARM Cortex A9 MPCore References ... more details
. 1992 . http ieeexplore.ieee.org xpls abs all.jsp?arnumber 186696 A high speed superscalar PA RISC ... 229260 A 100 MHz superscalar PA RISC CPU coprocessor chip . 1992 Symposium on VLSI Circuits ... more details
In computer engineering , an execution unit also called a functional unit is a part of a central processing unit CPU that performs the operations and calculations called for by the computer program . It may have its own internal control sequence unit not to be confused with the CPUs main control unit , some processor register register s, and other internal units such as a sub arithmetic logic unit ALU or floating point unit FPU , or some smaller, more specific components. It is commonplace for modern CPUs to have multiple parallel execution units, referred to as scalar or superscalar design. The simplest arrangement is to use one, the bus manager, to manage the memory interface, and the others to perform calculations. Additionally, modern CPUs execution units are usually instruction pipelining pipelined . References reflist nofootnotes date August 2010 http www.cs.umass.edu weems CmpSci535 Discussion10.html Execution Unit discussion from the University of Massachusetts Amherst CPU technologies Category Central processing unit Category Computer arithmetic engineering stub cs Matematick koprocesor de Rechenwerk el es Unidad funcional fr Unit de calcul en virgule flottante id Unit titik mengambang it Unit di calcolo in virgola mobile hu FPU nl Floating Point Unit ja pt Unidade de ponto flutuante ru sk Matematick koprocesor sv Flyttalsprocessor zh ... more details
from SH 2 up to SH 4 were getting unified into a superscalar SH X core which forms a kind of instruction ... but most importantly moving to a superscalar architecture it is capable of executing more than one ... on the SH 2A core include Superscalar architecture execution of 2 instructions simultaneously ... more details
IBS may stand for Academia International Biometric Society , an academic statistical association for mathematical and statistical methods in the biosciences Indiana Boys School, a former name of Plainfield Juvenile Correctional Facility Institute of Bangladesh Studies , a research institute in Rajshahi University Associations Institute of Broadcast Sound , a UK broadcasting professional association Intercollegiate Broadcasting System , an organization of non profit, education affiliated radio stations and webcasters International Bible Society, a former name of Biblica , a group that translates and publishes the Bible with the intent of Christian proselytization Instytutu Bada Strukturalnych, the Institute for Structural Research Business Internet Broadcasting , a web design firm focused on broadcast television International Builders Show , an annual trade show organized by the National Association of Home Builders INTELSAT business service , a satellite communication standard provided by Intelsat INTELSAT Integrated business solutions , software and WEB solutions Fiction IBS , a satirical news channel on the BBC s programme Broken News Medical Irritable bowel syndrome , a disorder of the bowel Ichthyosis bullosa of Siemens , a genetic skin disorder Science and technology Intrabeam Scattering , a collective effect arising in high intensity particle beams Sputter deposition Ion beam sputtering Ion beam sputtering , a type of sputter deposition Identity by type Identical by State , a genetic term also known as non identical by type NIBT Instruction Based Sampling , an implementation of a hardware performance counter used to collect performance data in a superscalar microprocessor Ideal body size , a component of the figure rating scale Other disambig de IBS it IBS nl IBS ja IBS pl IBS fi IBS sv IBS ... more details
Unreferenced date December 2009 Keith Diefendorff is a computer architect and veteran in the microprocessor industry. Diefendorff is one of the persons that has led the industry in developing RISC processors, both for embedded system s and superscalar high performance systems. He is one of the main designers of the PowerPC family of processors. Background Keith Diefendorff started at Texas Instruments , designing integrated circuits processors and systems. Later Diefendorff joined Motorola and was the chief architect of a second generation implementation of the Motorola 88000 88000 instruction set architecture , the 88110 . The 88110 was not a commercial success, and when Motorola shifted focus to creating a new RISC architecture with IBM, Diefendorff was assigned as chief architect for the PowerPC . After his work at Motorola Diefendorrf moved to NexGen as director of technical x86 strategy. Diefendorff joined AMD when NexGen was acquired by AMD. From AMD Diefendorrf then moved to Apple Computer Apple as architect for the AltiVec media extensions developed for the PowerPC processors used by Apple. Keith Diefendorff has been working in the embedded processor space. First at the embedded processor IP core company ARC International . After ARC Diefendorrf moved to MIPS Technologies . Diefendorrf has also worked as processor analyst, and editor in chief 1998 2001 for the industry magazine Microprocessor Report . Cquote2 I m not sure competition from any company is Intel s biggest problem. A bigger problem is generating demand for its faster, more profitable desktop chips... Keith Diefendorff on the main threats to Intel DEFAULTSORT Diefendorff, Keith Category Power Architecture ... more details
Jim Kahle is an IBM Fellow and Chief Architect and Director of Technology at the center for Cell microprocessor Cell Technology in Austin, Texas . Mr. Kahle was born in Venezuela where his father worked in the oil business. He received his B.S. degree from Rice University in 1983. He has been working for IBM since the early 1980s on RISC based microprocessors . His work started in physical design tools and is currently concentrated on RISC architecture. With over 20 years of experience of chip design, and about 160 patents, he has been key to defining the Power Architecture and the superscalar microprocessor designs at IBM. He has been on the forefront of developing multicore designs, asymmetric multiprocessing asymmetric multiprocessors and Simultaneous multithreading SMT microarchitecture s. He was the key designer for the POWER1 RIOS processor that launched the RS 6000 family of workstations and servers and one of the founders of the Somerset Design Center, birthplace of the PowerPC architecture, where he was the project manager for the PowerPC 600 PowerPC 603 PowerPC 603 and subsequent designs like the PowerPC 750 . He was also chief architect for the POWER4 core. References http www.research.ibm.com journal rd 494 kahleaut.html Introduction to the Cell multiprocessor Author Bios, IBM http www.power.org devcon 07 speakers Keynote Speakers, Power ArchitectureDevelopers Conference 2007, Power.org http www.computerpoweruser.com editorial article.asp?article articles archive c0702 67c02 67c02.asp&guid Q&A With Jim Kahle, Computer Power User.com http www.crn.com it channel 171203526 Jim Kahle, IT Channel News DEFAULTSORT Kahle, James A. Category Power Architecture Category IBM Fellows Category Rice University alumni Category Living people ... more details
Power Architecture Image MPC5200.jpg thumb left A 400 MHz PowerPC 5000 MPC52xx MPC5200 from an EFIKA computer. The PowerPC e300 is a family of 32 bit Power Architecture microprocessor cores developed by Freescale for primary use in system on a chip SoC designs with speed ranging up to 800 MHz, thus making them ideal for embedded system embedded applications . The e300 is a superscalar RISC core with 16 16 or 32 32 kB L1 data instruction caches, a four stage Instruction pipeline pipeline with load store, system register, Branch predictor branch prediction and Arithmetic logic unit integer unit with optional double precision Floating point unit FPU . The e300 core is not compatible with the latest Power Architecture Specifications Power ISA but adheres to the earlier PowerPC specification and is completely backwards compatible with the PowerPC 600 G2 G2 and PowerPC 600 PowerPC 603e .2F 603ev PowerPC 603e cores from which it derives. The e300 core is the CPU part of several SoC processors from Freescale The MPC83xx PowerQUICC PowerQUICC II Pro PowerQUICC II Pro family of telecom and network processors. The PowerPC 5000 MPC51xx MPC51xx and PowerPC 5000 MPC52xx MPC52xx family of automotive and industrial control processors. MSC7120 GPON, optical network processor integrated Digital signal processor DSP unit. http www.freescale.com files optical networking doc fact sheet MSC7120GPONFS.pdf Category PowerPC microprocessors E300 Category Freescale microprocessors E300 de PowerPC e300 fr PowerPC e300 ... more details
The MC88100 is a microprocessor developed by Motorola that implemented 88000 instruction set architecture . Announced in 1988, the MC88100 was the first 88000 implementation. It was succeeded by the MC88110 in the early 1990s. The microprocessor was a superscalar design with multiple integer and floating point units that executed instructions Out of order execution in order . The MC88100 had separate instruction and data CPU cache cache s. These caches were implemented with the MC88200 integrated circuit , which contains a memory management unit and an amount of cache. The MC88100 requires two of these devices for each cache, and additional MC88200s could be added to increase the size of the caches. This partitioned scheme was chosen to provide system flexibility, the amount of cache could be varied depending on the price point. In practice, these additional chips required more space on the circuit board and the buses between the MC88200s and MC88100 added complexity and cost. The MC88100 contained 165,000 transistors and the MC88200 750,000 transistors. Both were fabricated by Motorola in its 1.5 m complementary metal&ndash oxide&ndash semiconductor process. The MC88100 was ultimately commercially unsuccessful. citation needed date December 2010 This was due to a number of reasons, including requirement of MC88200s, but was mostly due to Motorola being a vendor of the highly successful 68000 family. As the 68000 division viewed the 88000 as a competitor, they forced the MC88100 to be priced unacceptably high for a volume part. citation needed date December 2010 The part did find use in the high end embedded market, in Motorola s own computers, and in large computers from companies such as Data General . References Furber, Stephen Bo 1989 . VLSI RISC Architecture and Organization . pp. 184 192. CRC Press . Motorola processors DEFAULTSORT Mc88100 Category Motorola microprocessors ru MC88100 ... more details
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