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Topic: OOP for SIMD

It is cast by this question the Author: sergey2b Date: 07.02 07:17 interview. We assume that we want to make the translator With ++-like language under CUDA or another SIMD a platform. Essential restriction is that there it is impossible to cause the code by the pointer. How there to make at least modest polymorphism? I think what organically to offer decisions on With ++, but the main thing here not language, and ideas

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Re: OOP for SIMD

Hello, Erop, you wrote: E> It is cast http://rsdn.ru/forum/cpp/6339088.flat] by this question on interview. E> we assume that we want to make the translator With ++-like language under CUDA or another SIMD a platform. E> essential restriction is that there it is impossible to cause the code by the pointer. E> how there to make at least modest polymorphism? I think what organically to offer decisions on With ++, but the main thing here not language, and If I correctly understood ideas, then a problem that we cannot cause methods of base class from a subclass. So?

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Re: OOP for SIMD

Hello, Qulac, you wrote: Q> If I correctly understood, then a problem that we cannot cause methods of base class from a subclass. So? We can. The same simply subroutine... At us it is a lot of data streams, but one flow of commands. It is possible to calculate a bit flag which masks performance of commands for some of data streams. That is branchings are accessible. And here to cause in one flow one function, and in the friend another we can, of course, but be necessary to mask all function in one those flows where did not call one, and then where did not call another.

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Re: OOP for SIMD

Hello, Erop, you wrote: E> we Assume that we want to make the translator With ++-like language under CUDA or another SIMD a platform. E> essential restriction is that there it is impossible to cause the code by the pointer. E> how there to make at least modest polymorphism? I think what organically to offer decisions on With ++, but here not language, and ideas of Sho, even passage it is impossible to make the main thing? Well you and the joker.

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Re: OOP for SIMD

Hello, Erop, you wrote: E> Hello, Qulac, you wrote: Q>> If I correctly understood, then a problem that we cannot cause methods of base class from a subclass. So? E> we Can. The same simply subroutine... E> At us it is a lot of data streams, but one flow of commands. It is possible to calculate a bit flag which masks performance of commands for some of data streams. E> that is branchings are accessible. E> and here to cause in one flow one function, and in the friend another we can, of course, but be necessary to mask all function in one those flows where did not call one, and then where did not call another.

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Re: OOP for SIMD

Hello, Ikemefula, you wrote: I> Sho, even it is impossible to make passage? Well you and the joker. Under the pointer In the DATA... Here truth so few people do not know, what such SIMD and google?

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Re: OOP for SIMD

Hello, Erop, you wrote: I>> Sho, even it is impossible to make passage? Well you and the joker. E> under the pointer In the DATA... E> Here truth so few people do not know, what such SIMD and google? The pointer is not necessary. It is necessary  the data in procedures. Sm JavaScript or any dynamic

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Re: OOP for SIMD

Hello, Ikemefula, you wrote: I> the Pointer is not necessary. It is necessary  the data in procedures. Sm JavaScript or any dynamic  At what here language? In any made language it is possible to express. Dynamic language here does not roll. The virtual call is too a call of the code by the dynamic pointer

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Re: OOP for SIMD

Hello, Erop, you wrote: I>> the Pointer is not necessary. It is necessary  the data in procedures. Sm JavaScript or any dynamic  E> At what here language? The example of operating implementation which possesses the properties necessary to you.> dynamic language here does not roll. The virtual call is too a call of the code by the dynamic pointer Here the compiler should  the virtual calls through  ' method name '-'ukazatel on the code ', i.e. generate that  ... switch (ch) {case "Run": slots ["Run"]-> callThisTwoArgs (self, arg1, arg2);}.

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Re: OOP for SIMD

Hello, Kodt, you wrote: 1. To make the virtual machine. In the virtual machine to make everything, everything, including indirect passages and virtual method tables. 2. To make directories of functions with the identical signature (to enumerate them) and mega-branchings under number It on architecture * absolutely lays down * so we tell... The Lack consists that dial-ups of redefinitions of functions (well or dial-ups of classes) are fixed. Simply it is impossible so on the move to expand, it is necessary . Actually, we incur a role  and the loader which distribute addresses to characters. It, just, can to make the compiler also... 3. To write the  and . (Even  it is not required to alter the compiler!) The Set of entry points for a moment  is known, - it is possible to impose the mega-dispatcher entry point accepting argument "the identifier of a label of passage". And identifiers of a label of passage will be pointers on function just. Whether string, whether numerical - it is not important., Besides,  Indirect passage can distribute numbers is to suppose the label identifier in the register and to pass to the mega-manager. Well something like, but are interesting particulars 1) As in the code can be made out it 2) In what, approximately, and how to compile Well and what, approximately, the code, such approach pulls... Here, for example, we have pieces five primitives graphic, and their polymorphic list, we should process somehow...

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Re: OOP for SIMD

Hello, Ikemefula, you wrote: E>> At what here language? I> the example of operating implementation which possesses the properties necessary to you. It  any language is possible . In JS it too all polymorphicly expensively turns out...>> Dynamic language here does not roll. The virtual call is too a call of the code by the dynamic pointer I> Here the compiler should  the virtual calls through  ' method name '-'ukazatel on the code ', i.e. generate that   I> I>... I> switch (ch) {I> case "Run": I> slots ["Run"]-> callThisTwoArgs (self, arg1, arg2); I>} I>. I> So this iron is not able... On idea, something is necessary like mp...

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Re: OOP for SIMD

Hello, Erop, you wrote: E> It  any language is possible . In JS it too all polymorphicly expensively turns out... Expensively. But generally, it is possible  since all identifiers are known at a compilation stage. I>> here the compiler should  the virtual calls through  ' method name '-'ukazatel on the code ', i.e. generate that   I>> I>>... I>> switch (ch) {I>> case "Run": I>> slots ["Run"]-> callThisTwoArgs (self, arg1, arg2); I>>} I>>. I>> E> So this iron is not able... Is able. Serial calculations on  turn out  expensive. mp is and to a hedgehog it is clear.

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Re: OOP for SIMD

Hello, Kodt, you wrote: mov %reg1000 %, ID_Function2 push %IP % + 4 jmp @goto_indirect And unless SIMD so can? In the same place   kernels under one program ? Accordingly, it is necessary to do artfully somehow... If in different kernels the different address of passage is calculated, what to do? I so understand that it is necessary to calculate somehow on bool' on a kernel, in what kernel executable code in what is not present... And so by turns the virtual functions one for another to execute. A separate subject - so it is dexterous  the code of different competing century of functions, what  instructions at once in several. With a recursion, but a recursion it is possible not to do an interesting question, for example...

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Re: OOP for SIMD

Hello, Ikemefula, you wrote: I> Is able. Serial calculations on  turn out  expensive. mp is and to a hedgehog it is clear. Syntactic constructions similar will be... Well, for example, in a code piece where the virtual calls are possible, probably it will be necessary to enumerate accessible implementations...

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Re: OOP for SIMD

Hello, Erop, you wrote: E> It is cast by this question the Author: sergey2b Date: 07.02 07:17 on interview. E> we assume that we want to make the translator With ++-like language under CUDA or another SIMD a platform. E> essential restriction is that there it is impossible to cause the code by the pointer. E> how there to make at least modest polymorphism? I think what organically to offer decisions on With ++, but the main thing here not language, and ideas Well same is senseless for CUDA. All counter CUDA that the same code is executed on all elements simultaneously. Any branching (and at you, as a matter of fact, there will be a branching on type even if it will be hidden at language level in a beautiful jacket) normally means that one wait that, others. Well and sense?

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Re: OOP for SIMD

Hello, jazzer, you wrote: J> Well same it is senseless for CUDA. All counter CUDA that the same code is executed on all elements simultaneously. Any branching (and at you, as a matter of fact, there will be a branching on type even if it will be hidden at language level in a beautiful jacket) normally means that one wait that, others. Well and sense? Well, sometimes, it would be desirable... Here at you it is necessary to make something with a heap of primitives of three types, for example to calculate a shade. The part of the code specific to a primitive differs small only. Now you write a kernel of type so:  the code of (1) {the code for a primitive 1} of (a primitive 2) {the code for a primitive 2} of (a primitive 3) {the code for a primitive 3} still  the code and could write a primitive more conveniently somehow. Only a question as?

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Re: OOP for SIMD

Hello, Kodt, you wrote: And, understood that you want. That there was one flow of instructions, and all ramifyings appeared purely in the data. Yes, SIMD ... Actually that on CUDA it is impossible to write  or less With + the code a little hinders. It is clear that all power  not to tear, and any restrictions, and, probably, support in the code are necessary (for example a marking, what implementations of the virtual method here are admissible), but it all the same not too most that absolutely other implementation on case SIMD... 1) Still, the virtual machine. Perhaps, any absolutely primitive, type of a fort or . Not clearly what for. On idea, we  kernels at loading in SIMD so that the machine gives to century? Or a certain interpreter simply means? Type the code one, and control in the data?> 2) Serialization: The same data is processed parallely (SIMD), varied - at first one component by one method, remaining components do not change, then the second component the second method, etc. Well I something such and thought, only I still taught  so  the code of alternative methods that would be possible him as much as possible  in all flows. Well, type there is at us an instruction "to add that to it", and it is necessary to add something to something in three alternatives from five. Well we adjust necessary argument, in everyone by turns, and then we add at once in all. For one given have time to be pumped over... 3) Asynchronous rescheduling: as soon as met the varied data, - to suppose components in queue of output agents of appropriate type. I.e. the mechanism of sending of messages. Here, most likely, will be . Expensive penalties for chaotic access to storage...

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Re: OOP for SIMD

Hello, Erop, you wrote: E> Actually that on CUDA it is impossible to write  or less With + the code a little hinders. Sense Cuda here in what here you solved something  on 100 thousand flows. You cannot write simply physically hands the separate code for each of 100 thousand flows? The code will be for each flow one. Or at least there will be some groups of flows with the general code. It is not necessary  in each flow the megalogic which somehow there with other flows with the megalogic will interact. Such in 100 thousand independent flows you will not launch

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Re: OOP for SIMD

Hello, __ kot2, you wrote: __> sense Cuda here in what <...> __> it is not necessary  in each flow the megalogic which somehow there with other flows with the megalogic will interact. Such in 100 thousand independent flows you will not launch And the sense of "etude" consists in a question what to do, if though and it is impossible, but all the same very much it would be desirable to screw OOP, at least on ...

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Re: OOP for SIMD

Hello, Kodt, you wrote: On  it is possible somehow. But you started to specify - I do not want to be  machine, I want to be the empress multi-threaded. Well, century  one of variants worthy arguings... But it is not absolutely clear how to do, if it is fair.