cpu-architecture | 易学教程

von neumann vs harvard architecture

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问题 Why computer architecture based on von Neumann architecture is preferred over Harvard architecture, when designing personal computers; while Harvard architecture is used for designing microcomputer based computer systems and DSP based computer systems? 回答1: Well current CPU designs for PC's have both Harvard and Von Neumann elements ( more Von Neumann though ). If you look at the L1 caches you would see that in AMD, ARM and Intel systems you have Instruction L1 Cache and Data L1 Cache, that

Visual Studio MVC Platforms - x86 and x64?

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We had quite an annoying issue that started about a month ago, where we could add a controller in an MVC project which required automatic code generation/scaffolding. We figured out today that it was something to do with the platform. Originally, it was set to Any CPU which to me seems the correct setting. However, we set it to x86 as the version of Visual Studio we have is 32-Bit, and we were able to add controllers again. Added a controller, built, and went to view the application and it gives the following error: Could not load file or assembly 'Dashboard' or one of its dependencies. An

Preserving the Execution pipeline

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Return types are frequently checked for errors. But, the code that will continue to execute may be specified in different ways. if(!ret) { doNoErrorCode(); } exit(1); or if(ret) { exit(1); } doNoErrorCode(); One way heavyweight CPU's can speculate about the branches taken in near proximity/locality using simple statistics - I studied a 4-bit mechanism for branch speculation (-2,-1,0,+1,+2) where zero is unknown and 2 will be considered a true branch. Considering the simple technique above, my questions are about how to structure code. I assume that there must be a convention among major

CPU Numbering on a hypertheading enabled system

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问题 I am trying to find out how an OS (Windows, linux) assigns numbers to logical cpus in a Hyper threading enabled environment. ? Does both the OSs first serially assign numbers to the Physical CPUs and then start numbering the logical cpus or is there some other rule followed.. ? e.g. in 2 physical cpu system with hyper threading , does an OS assign number 0,2 to the first physical cpu and then 1,3 to second physical cpu .. ? Any references would be really appreciated. Thanks in advance.

Deploying to OS X 10.6 and “-fobj-arc is not supported on platforms using the legacy runtime”

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问题 Background: I'm building an app for OS X with deployment target of 10.6. I have not converted my app to ARC completely, but I am adding a few new classes which would benefit from ARC, so I have set the -fobj-arc compiler flag for those classes. Compiling fails for Universal 32/64-bit Intel architecture, with error -fobj-arc is not supported on platforms using the legacy runtime . Building for 64-bit only succeeds. I'm not well versed in low level architecture. My question is: what is the

16 bit logic/computer simulation in Swift

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问题 I’m trying to make a basic simulation of a 16 bit computer with Swift. The computer will feature An ALU 2 registers That’s all. I have enough knowledge to create these parts visually and understand how they work, but it has become increasingly difficult to make larger components with more inputs while using my current approach. My current approach has been to wrap each component in a struct . This worked early on, but is becoming increasingly difficult to manage multiple inputs while staying

What's the role of EX stage for branching in Pipelined MIPS w Forwarding?

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问题 Consider the following Pipelined Processor structure: Notice that the condition test for branching (the = circuit), as well as the target address calculation for the next instruction in case of branch taken are executed in the ID phase - as a way to save on stalls/flushes (as opposed to doing all that in the EX phase and forwarding the results in the MEM phase of the given branch instruction). Since all the work gets done in Instruction Decode stage, why bother waiting for the given branching

x86 and x64 share instruction set?

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问题 I don't know how 32bit application can run on a 64bit OS. My understanding is 32bit/64bit refers to register size. An instruction set should be different as they have different sizes of register. But I know there is x86-64 instruction set that is the 64bit version of the x86 instruction set. Is the reason we can run 32bit application on 64bit OS is because of the x86-64? If so, why are 32bit applications sometimes not compatible in 64bit windows? Why do we need WOW64? (Sometimes we are asked

How to check CPU name, model, speed on Windows/Linux C?

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问题 I would like to get some infos with C about hardware: how many CPU's I have how many cores have each of them how many logical cores have every core in every CPU CPU name + model CPU speed + frequency CPU architecture (x86, x64) I know that on Linux-like OS I can parse /proc/cpuinfo but since its not an ordinary file, I think its unsafe. Saw this answer on SO but it doesnt give me EVERY info I need. Should I call cat /proc/cpuinfo > file.txt and then parse file.txt ? I know about cpuid.h (Im

Does the Windows 8 Phone emulator emulate ARM or x86?

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问题 Does anyone know if the Windows 8 Phone emulator uses ARM or x86 for it's CPU architecture? 回答1: It's indeed a x86 virtualization. ARM is only for devices. Inhouse or 3rd party native components need to be build for the both architectures, if you want to test on the emulator. 回答2: Emulator is x86, devices are ARM. 来源： https://stackoverflow.com/questions/13197010/does-the-windows-8-phone-emulator-emulate-arm-or-x86