Vc | SIMD Vector Classes for C++

 by   VcDevel C++ Version: 1.4.3 License: BSD-3-Clause

kandi X-RAY | Vc Summary

kandi X-RAY | Vc Summary

Vc is a C++ library typically used in Big Data applications. Vc has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can download it from GitHub.

Recent generations of CPUs, and GPUs in particular, require data-parallel codes for full efficiency. Data parallelism requires that the same sequence of operations is applied to different input data. CPUs and GPUs can thus reduce the necessary hardware for instruction decoding and scheduling in favor of more arithmetic and logic units, which execute the same instructions synchronously. On CPU architectures this is implemented via SIMD registers and instructions. A single SIMD register can store N values and a single SIMD instruction can execute N operations on those values. On GPU architectures N threads run in perfect sync, fed by a single instruction decoder/scheduler. Each thread has local memory and a given index to calculate the offsets in memory for loads and stores. Current C++ compilers can do automatic transformation of scalar codes to SIMD instructions (auto-vectorization). However, the compiler must reconstruct an intrinsic property of the algorithm that was lost when the developer wrote a purely scalar implementation in C++. Consequently, C++ compilers cannot vectorize any given code to its most efficient data-parallel variant. Especially larger data-parallel loops, spanning over multiple functions or even translation units, will often not be transformed into efficient SIMD code. The Vc library provides the missing link. Its types enable explicitly stating data-parallel operations on multiple values. The parallelism is therefore added via the type system. Competing approaches state the parallelism via new control structures and consequently new semantics inside the body of these control structures.
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            kandi-support Support

              Vc has a medium active ecosystem.
              It has 1302 star(s) with 141 fork(s). There are 65 watchers for this library.
              OutlinedDot
              It had no major release in the last 12 months.
              There are 78 open issues and 178 have been closed. On average issues are closed in 322 days. There are 9 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of Vc is 1.4.3

            kandi-Quality Quality

              Vc has 0 bugs and 0 code smells.

            kandi-Security Security

              Vc has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              Vc code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              Vc is licensed under the BSD-3-Clause License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              Vc releases are available to install and integrate.
              Installation instructions, examples and code snippets are available.
              It has 186 lines of code, 0 functions and 1 files.
              It has low code complexity. Code complexity directly impacts maintainability of the code.

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            Vc Key Features

            No Key Features are available at this moment for Vc.

            Vc Examples and Code Snippets

            No Code Snippets are available at this moment for Vc.

            Community Discussions

            QUESTION

            PIP failed to build package cytoolz
            Asked 2022-Mar-26 at 18:26

            I'm trying to install eth-brownie using 'pipx install eth-brownie' but I get an error saying

            ...

            ANSWER

            Answered 2022-Jan-02 at 09:59

            I used pip install eth-brownie and it worked fine, I didnt need to downgrade. Im new to this maybe I could be wrong but it worked fine with me.

            Source https://stackoverflow.com/questions/69875694

            QUESTION

            Error while installing truffle using "npm i truffle -g"
            Asked 2022-Feb-24 at 02:31

            while installing truffle on my desktop.An anonymes error ...

            first its showing the error related to python which is strange but then i install python now this error `

            ...

            ANSWER

            Answered 2022-Jan-31 at 04:58

            You have to install Visual Studio Community 2022 as well as Visual Studio Code. And when installing Visual Studio Community, you have to install desktop development with C++ with some optional packages.

            Source https://stackoverflow.com/questions/70821629

            QUESTION

            Wrong result of multiplication: Undefined behavior or compiler bug?
            Asked 2022-Feb-18 at 23:52
            Background

            While debugging a problem in a numerical library, I was able to pinpoint the first place where the numbers started to become incorrect. However, the C++ code itself seemed correct. So I looked at the assembly produced by Visual Studio's C++ compiler and started suspecting a compiler bug.

            Code

            I was able to reproduce the behavior in a strongly simplified, isolated version of the code:

            sourceB.cpp:

            ...

            ANSWER

            Answered 2022-Feb-18 at 23:52

            Even though nobody posted an answer, from the comment section I could conclude that:

            • Nobody found any undefined behavior in the bug repro code.
            • At least some of you were able to reproduce the undesired behavior.

            So I filed a bug report against Visual Studio 2019.

            The Microsoft team confirmed the problem.

            However, unfortunately it seems like Visual Studio 2019 will not receive a bug fix because Visual Studio 2022 seemingly does not have the bug. Apparently, the most recent version not having that particular bug is good enough for Microsoft's quality standards.

            I find this disappointing because I think that the correctness of a compiler is essential and Visual Studio 2022 has just been released with new features and therefore probably contains new bugs. So there is no real "stable version" (one is cutting edge, the other one doesn't get bug fixes). But I guess we have to live with that or choose a different, more stable compiler.

            Source https://stackoverflow.com/questions/70823697

            QUESTION

            How can i install pygame on my internet not connected computer?
            Asked 2022-Feb-08 at 11:03

            i'm trying to install pygame package on my computer which one is not connected to internet.

            (env : windows10, python 3.9(anaconda))

            so i downloaded a "pygame-2.1.2.tar" file from www.pypi.org and then tried to install it

            from cmd with "python setup.py install" commend.

            then it shows error message like below

            ...

            ANSWER

            Answered 2022-Feb-08 at 04:49

            you can run command: pip install pygame

            Source https://stackoverflow.com/questions/71028609

            QUESTION

            White Screen Shows for Minutes Before Launching App - Xcode 13 on iOS 15.1.1
            Asked 2021-Dec-17 at 06:06

            This is a weird bug I'm getting using Xcode 13 and iOS 15.1.1. I've developed a simple app and when I run the app on iOS 15.1.1 (iPhone 13 Pro), before the app launches a white screen (black in case dark mode is ON), is shown, for couple of minutes.

            Does anyone know a work around this? This completely disrupts the development process and breaks the flow while testing the app. Build time is within a minute and you have to wait extra time for the white screen to go away.

            I've tried the following solutions but it didn't work

            1. Removing iOS DeviceSupport and restarting Xcode

            rm -r ~/Library/Developer/Xcode/iOS\ DeviceSupport

            Edit 1: This is happening only when run button from Xcode is pressed and after it once launches from Xcode and then I close the app and start again from phone it works normal

            Deleting DerivedData too did not work

            Some code to give reference:

            AppDelegate.swift

            ...

            ANSWER

            Answered 2021-Dec-17 at 06:06

            The issue finally resolved. I updated my Xcode to 13.2 and it fixed it. Not sure what was causing it. But it's fixed with the new Xcode update

            Source https://stackoverflow.com/questions/70255205

            QUESTION

            Debugging into MFC header code does not work with Visual Studio 2019
            Asked 2021-Dec-01 at 11:23

            TL;DR: Debuigging into MFC (CString) header code does not work on both my machines and as far as I can tell this is due to the peculiar way these headers are compiled.

            Stepping through MFC header code when entered via disassembly works, but setting brealpoints does not work.

            I'm looking for a workaround or at least acknowledgement of my analysis.

            System:

            • Visual Studio 2019 Professional 16.9.6
            • Windows 10 / 1809 Enterprise LTSC

            Setup: (I do apologize for this being rather long.)

            • Create a Visual Studio 2019 Example MFC Application Project (SDI App)

            • Make sure Enable Just My Codeis off under Options -> Debugging -> General.

            • Set the build configuration to Debug/x64 (does not make a difference, but let's all stay on the same page)

            • Navigate to MFCApplication1.cpp -> CMFCApplication1App::InitInstance()

            • Insert a CString init like this:

              ...

            ANSWER

            Answered 2021-Dec-01 at 10:41

            Uncheck the Enable Just My Code option in Tools->Options->Debugging

            I know that works for c++ std:: library code debugging. The other technique I do, when I forget to uncheck this option, is similar to what you describe above.

            1. Set a breakpoint on the line of code I want to step into.
            2. When the breakpoint is reached, right click in the editor window and select "Go To Disassemly".
            3. In disassembly mode, step over until you get to a call statement. That's typically the std library. Eventually, you'll navigate into a mix of assembly and system code sources. You can flip out of disassembly mode by right-clicking again and selecting "go to source code".

            Source https://stackoverflow.com/questions/70182512

            QUESTION

            can't install cargo wasm-pack
            Asked 2021-Nov-24 at 20:29

            When i run cargo install wasm-pack on windows 10 64-bit i get this error:

            ...

            ANSWER

            Answered 2021-Aug-04 at 07:28

            Make sure you have the development packages of Open SSL installed. For example, libssl-dev on Ubuntu or openssl-devel on Fedora. If OpenSSL is already installed and the crate still had trouble finding it, you can set the OPENSSL_DIR environment variable to specify the path for your Open SSL installation. If you are using windows you can use the Win32/Win64 OpenSSL Installation Project to provide a simple installation of OpenSSL on windows.

            Source https://stackoverflow.com/questions/68646684

            QUESTION

            Address Sanitizer in MSVC: why does it report an error on startup?
            Asked 2021-Nov-01 at 11:41

            I'm trying a project that uses Qt with MSVC 2019 with Address Sanitizer. I built with Address Sanitizer the project, but didn't rebuild all libs, including Qt.

            it crashes inside Qt in resource initialization (with qRegisterResourceData in the call stack).

            Is this:

            • Misuse of address sanitizer, like, I should rebuild Qt DLLs with it too?
            • An issue in Qt I should investigate deeper?
            • Known Qt issue?

            I've recreated the issue in Widget application created by Wizard by default. The call stack is as follows:

            ...

            ANSWER

            Answered 2021-Nov-01 at 11:41

            The issue is load order.

            Qt happens to load before ASan and load C/C++ runtime before ASan DLLs loaded. Qt performs some initialization. So the memory is malloced without ASan knowledge, and later ASan sees realloc without prior malloc, which it reports.

            Building Qt with ASan should resolve the issue, I have not tried that, as I have found a workaround that does not involve Qt rebuild.

            The workaround: just make Qt DLLs import ASan DLLs. For me it is via the following commands:

            Source https://stackoverflow.com/questions/69678689

            QUESTION

            C++14 errors in C++17, LNK2019, C1001 altogether
            Asked 2021-Oct-22 at 15:19
            There's a pretty straightforward 3-file source.

            Compiling with cl.exe.

            • Using /std:c++17 it compiles with c++14 errors (error C3533: a parameter cannot have a type that contains 'auto').
            • Using /std:c++20 it compiles but gives an LNK2019.
            • When using /std:c++20, BUT WITH #include moved from serialization.cpp => database.h, it gives a fatal internal compiler error C1001.
            The source files:

            database.h:

            ...

            ANSWER

            Answered 2021-Aug-29 at 12:56
            1. auto in function parameter list makes an abbreviated function template, a C++20 feature
            2. As the function is template, you need to move the function definition to header, as usual with templates, to make the program link; see Why can templates only be implemented in the header file?
            3. Report ICE to https://developercommunity.visualstudio.com/home or via Help > Send Feedback > Report a problem... from Visual Studio

            Source https://stackoverflow.com/questions/68972950

            QUESTION

            How to create multithread logger in c++
            Asked 2021-Oct-16 at 19:42

            I want to create a multithread logger in c++ which can be called from c code as well.

            This is in my source.cpp file:

            ...

            ANSWER

            Answered 2021-Oct-16 at 19:42

            There are multiple problems with your code:

            1. argument for operator() should be float x NOT float* since this is what you are passing to thread
            2. your log function conflicts with standard math log. Either change function name or put it into different namespace
            3. printf using format specifier "%d". It should be "%f" since input is float
            4. You don't need to put extern "C" for classes. You are avoiding name mangling only for log function which need to be called from c file.

            Source https://stackoverflow.com/questions/69589101

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install Vc

            GCC >= 4.8.1
            clang >= 3.4
            ICC >= 18.0.5
            Visual Studio 2015 (64-bit target)

            Support

            The documentation is generated via doxygen. You can build the documentation by running doxygen in the doc subdirectory. Alternatively, you can find nightly builds of the documentation at:.
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