Search the forum,

register

A processor register is a quickly accessible location available to a computer's processor. Registers usually consist of a small amount of fast storage, although some registers have specific hardware functions, and may be read-only or write-only. In computer architecture, registers are typically addressed by mechanisms other than main memory, but may in some cases be assigned a memory address e.g. DEC PDP-10, ICT 1900.
Almost all computers, whether load/store architecture or not, load data from a larger memory into registers where it is used for arithmetic operations and is manipulated or tested by machine instructions. Manipulated data is then often stored back to main memory, either by the same instruction or by a subsequent one. Modern processors use either static or dynamic RAM as main memory, with the latter usually accessed via one or more cache levels.
Processor registers are normally at the top of the memory hierarchy, and provide the fastest way to access data. The term normally refers only to the group of registers that are directly encoded as part of an instruction, as defined by the instruction set. However, modern high-performance CPUs often have duplicates of these "architectural registers" in order to improve performance via register renaming, allowing parallel and speculative execution. Modern x86 design acquired these techniques around 1995 with the releases of Pentium Pro, Cyrix 6x86, Nx586, and AMD K5.
When a computer program accesses the same data repeatedly, this is called locality of reference. Holding frequently used values in registers can be critical to a program's performance. Register allocation is performed either by a compiler in the code generation phase, or manually by an assembly language programmer.

View More On Wikipedia.org
Recent contents Top users
  1. U

    leaky boiler pipe

    Hi All I have a leacy 22mm flow return pipe on my boiler which has a bend in it. If i repaired with braided hose with 22mm couplings would it still be ok even if the hose is less than 22mm diameter ?
  2. D

    Gas

    Hi, we had a new boiler installed about 18 months ago, since then we have had to call a gas registered plumber out to help with some central heating issues. During this time he did a gas test involving all our gas appliances which resulted in him saying that there wasn't enough gas getting to...
  3. U

    Covering up our boiler

    Hello, We have been advised by our landlord that our covering the exposed pipes at the base of our boiler with a make shift plastic cover (to stop a draft coming through the large hole in the wall) is what has stopped the hot water working in our kitchen (the hot water works everywhere else...
  4. U

    steve

    Hi i am interested in fitting a thermostatic shower valve in my house and was wondering what type of valve i need because the cold water is mains fed and the hot is low pressure can anyone help, thanks
  5. U

    John pedersen

    I have a tifell M (FF) the front panel is displaying correctly but is not firing up the oil flow,it worked ok first then suddenly stopped and no heat..? Can you help
  6. U

    Rads/hot water keeps going off??

    Hi, I wonder if anyone can help me with a problem I have had for the last month or so. I have an oil (Kero) central heating system which keeps going cold for both hot water and radiators. I have a mid position valve, 3 speed pump and a vertical tube with vent on the end at the back of...
    • Unregistered
    • Thread
    • central central heating system cold radiator going hot rads keeps register system valve water
    • Replies: 2
    • Forum: Plumbing Jobs | The Job-board
  7. U

    Loud bang when heating turns off

    Hi, I have recently moved into a new property where the heating had recently been installed, I have renovated the house so the boiler has been relocated and the radiators were all removed then refitted, the system is a gloworm boiler with two zones upstairs and downstairs with separate...
  8. U

    Lead Waste Pipe

    I have recently decided to tile my bathroom, i wanted to remove my basin to make things easier...upon investigating i was unable to undo the lead waste pipe so i resorted in sawing it off on the bend. My only worry now is how am i going to attatch a new one to this?? Is it possilbe to attatch...
  9. U

    Heatline vizo 24 no water

    Hello. i have a Hwatline vizo 24 boiler. i hadproblems wit the gas and it was suggested that i turn the cold water intake valve. now i cannot turn it back on and have no water to the boiler.
  10. U

    Anyway to bung an automatic air vent?

    I've noticed the automatic air vent on the top part of my boiler is leaking. Here's a photo: http://i.*********/Elb7Xqo.jpg It's in a position that would be bugger to replace so I'd rather not have to deal with getting it sorted right now, and I was hoping there would be a cap on it to close...
    • Unregistered
    • Thread
    • air air vent anyway automatic close please register sorted vent
    • Replies: 3
    • Forum: Plumbing Jobs | The Job-board
  11. U

    No hot water- warm air heating system

    We have recently moved into our property and up until the other day had hot water! We have a warm air heating system which the heating is working fine on but can't work out why water is not working. Can anyone help me????
    • Unregistered
    • Thread
    • air heating heating system hot hot water no hot water please register system warm water working
    • Replies: 2
    • Forum: Plumbing Jobs | The Job-board
  12. U

    Water mains

    Hi I've got a problem the builder has put a incoming mains on a new build and didn't cap it and the other end is coiled on the path water board has told him to retify it so I've flushed it out with water and capped both ends the water board has come out again and said they wouldn't continue till...
  13. U

    Central heating pump faulty ?

    Wilo pump RS15 when central bleed screw is removed lots of water shoots out rather than a dribble does this mean impeller is not spinning boiler is restarting every 30 seconds any clues please
    • Unregistered
    • Thread
    • answer central central heating faulty heating please pump register
    • Replies: 2
    • Forum: Plumbing Jobs | The Job-board
  14. B

    Pressure keeps dropping.

    Hi. Since last Friday I've noticed that my boiler is losing pressure and keeps doing it despite manual refilling it. I put it in the green to about the 1.5 mark but it will drop out the green to the edge of the 1 overnight. Then it will drop really slowly from there. It doesn't show any...
  15. U

    Can I use this Senzo Space Saving trap on my bath?

    Hi I have just bought this item, Senzo space saving trap, I intended to use it on my bath (the existing piping is in a very awkward position now I have put a new bath in). Senzo Space Saving Trap 1 1/2": Amazon.co.uk: Kitchen & Home All the info says this is a basin trap, can I still...
  16. U

    Changing washer in kitchen mixer tap

    Hi all, I hope someone can shed some light on my problem. I am trying to fix a dripping kitchen tap. I've taken the handle off one side of the mixer tap and instead of being able to get to the headgear nut it is covered by two plastic pieces that stop me being able to get to it. One is the...
    • Unregistered
    • Thread
    • being changing handle kitchen kitchen mixer tap mixer mixer tap receive register tap washer
    • Replies: 2
    • Forum: Plumbing Jobs | The Job-board
  17. U

    Identifying central heating pipework that has been cut and left unmarked.

    Hello, I have a question about a job I am currently doing which is causing a few problems at the moment, a job I am at where they are bit by bit renovating a fairly large house has had its boiler removed (Vaillant not that its relevant) and there are 4 cut pipes in the ceiling space which...
    • Unregistered
    • Thread
    • central central heating heating identify identifying pipework please register which
    • Replies: 2
    • Forum: Plumbing Jobs | The Job-board
  18. U

    Bright blue water in the heating system

    Has anyone ever seen bright blue water in the heating system before? It's the colour of copper sulphate from chemistry days at school. Obviously it is usually clear water. We've a mixture of UFH and radiators. We had the inhibitor level checked a few months back as quite a big system and wanted...
  19. U

    Letting a Property: AGA and boiler flues go into chimney

    I'm buying a property and the AGA and boiler flues go into the chimney. Because both are old I'm being told I'm going to have replace the boiler and AGA before I rent the property out because (i) the current flues are not satisfactory given they go into the chimney, and (ii) the flues can't be...
    • Unregistered
    • Thread
    • aga because boiler chimney flues letting oil property receive register
    • Replies: 2
    • Forum: Plumbing Jobs | The Job-board
  20. U

    Underfloor heating 1 room not warming up

    Hi, I'm hoping somebody could offer some advice. we have an underfloor heating system in 2 rooms (seperate zones, thermostat in each) it works fine in the first room but in the second room it doesn't get warm. what is confusing is the return feed for this room is hot so water is running...
    • Unregistered
    • Thread
    • could heating register return system ufh under floor heating underfloor underfloor heating
    • Replies: 7
    • Forum: Plumbing Jobs | The Job-board
Creating content since 2001. Untold Media.

Newest Plumbing Threads

UK Tiling Forum
Electricians' Talk
Electrician Talk Forum
UK Tiling Forum
Tile Cutters
Back
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.

I've Disabled AdBlock