Clang vs msvc performance github json This was specific to /MD (dynamic release) and the STL's GitHub CMake build system; it did not affect the legacy build system that's currently used for official builds of the MSVC toolset. remote-only=true is 1s slower than filesystem backend (on msvc). Jan 3, 2023 · I'm using anaconda Nuitka packages to obfuscate my python script PASS. An example project to test and compare different CI (Continuous Integration) services building a C++ project on Linux, Mac, Windows with GCC, Clang (libc++ and libstdc++), MSVC and Clang-cl. A working example of a C++ project compiling for Windows from Ubuntu on WSL using Clang/LLVM. Apr 19, 2024 · Chrome and Flutter usage of SkScalarIsFinite has been cleaned up in earlier CLs. However, we don't test MSVC in this configuration, and we don't test the two flags separately (we assume most people who want to disable RTTI also want to disable exceptions). exe, mt. CMake will probably be necessary though for building as you stated right now. 0, and in a virtual machine (what I'm using here) with no other software installed aside from the Visual Studio IDE and was able to reproduce the issue. in the C# API) Building Managed ClangSharp requires the . Nov 8, 2024 · EugeneZelenko added clang:frontend Language frontend issues, e. Apr 12, 2022 · Ah, my apologies about the workaround detail. Others like gcc and clang are not fully supported. You can also run clang-tidy directly from the terminal. Mar 25, 2023 · C:\Users\Utilisateur>clang --version clang version 16. At the moment we seem that we canncompile c++ with clang and c with cl. The problems were inspired and evolved from great computer science course "Algorithms: Theory Additionally, if you are writing a "performance improvement" PR, please add and run benchmarks to show that the PR does, in fact, improve performance. Practically both are well optimized, however, LLVM IR is much more robust and modular, than GCC IR. `SkIsFinite` continues to exist as private API in SkFloatingPoint. This may affect projects that have version assumptions. That should have rc. If GCC installs, it works, and if it doesn't work, it's the IDE's problem. Clang uses a lot of memoroy, and i've seen this absolutely destroy performance on machines that don't have enough memory (thrashes to disk like crazy). 0)" in the VS Installer. I have tested this both locally on Visual Studio 17. They come primarily in two different forms; packages named llvm-mingw-<version>-<crt>-ubuntu-<distro_version>-<arch>. py I've done below steps: installed Microsoft visual studio community edition 2022 with python development and Desktop development with C++ installed individual compon Nov 2, 2019 · what would be "different methods" and "different inputs" in this context? I mean writing to different buffers. MSVC is for those who don't care about C and want it to install without any pokin' around. 39 to 19. You can configure the checks that Clang-Tidy runs inside Visual Studio. Reload to refresh your session. Jan 16, 2014 · MSVC does this. My understanding is that this requires two steps. Problem is: it seems Clang forgets about "Program Files (x86)" inside MSYS, and searches these paths on my x64 Windows: Jun 7, 2023 · msvc 14. 5. LLVM clang and formulae? Output of brew config NA Output of brew doctor NA Description of issue Would it be possible (or even acceptable) to use a specific (non-Xcode/CLT) compiler for building a particular formula for per Jul 10, 2024 · I tried with both clang 19. Don't use for other compiler parts labels Jul 31, 2024 Copy link In this article, I want to discuss one compiler optimization technique - Profile-Guided Optimization (PGO). However the performance is awful (0. A partial list of new features: MSVC Toolset Update: The MSVC toolset version is updated from 19. exe fully supporting C inside cpp files too; almost fully GNUC compatible Jan 24, 2021 · Performance is pretty similar. In the project Property Pages dialog, open the Configuration Properties > Code Analysis > Clang-Tidy page. 5 with VS 2019 C++ v14. Select "MSVC v143 - VS 2022 C++ ARM64/ARM64EC build tools (Latest)" in the VS Installer if you would like to build the ARM64/ARM64EC target. Ummm. Oct 23, 2023 · Additional context. exe` on MSVC. The full report: msvc. May 16, 2021 · Even without this file Intellisense will not work using Clang (GNU CLI) If I try to generate this file, plugin seems to use wrong compilerPath (using MSVC cl. And I checked the ASM code, found out that clang automatically uses SIMD instructions for speed purposes. For MSVC, use /O2. Is this a bug in clang-cl? Is there a way to make clang-cl and MSVC generate the same layout for these structures? Feb 22, 2024 · no clang platform, you just set --toolchain=clang, but if you are using windows platform and installing package, you can only use msvc, do not switch toolchain, it does not support. 2; Bug Summary and Steps to Reproduce. mold is a faster drop-in replacement for existing Unix linkers. There are examples where snmalloc out performs mimalloc and there are examples where mimalloc out performs snmalloc. Program performance is affected by the choice of the compiler. 22621. 0GB/s. Clang uses LLVM in the backend. This paper reports a performance-based comparison of six state-of-the-art C/C++ compilers: AOCC, Clang, G++, Intel C++ compiler, PGC++, and Zapcc. One click 'Build Project' testing of Clang in Windows development May 23, 2024 · Endilll added clang Clang issues not falling into any other category platform:windows and removed clang-cl `clang-cl` driver. mold aims to enhance developer productivity by minimizing build time, particularly in rapid debug Apr 9, 2024 · On MSVC: std::unordered_map was similar to std::map in performance and memory usage. [VS Code setup] #windows #vscode #clang. Run git clang-format HEAD~1 to format your changes. Usually it's marginally faster with GCC. You can use naked functions anywhere and also add custom support like obfuscation. Clang attempts to unroll loops really, really aggressively. For maximum performance, it is recommended to compile with all available compiler optimizations: For Clang or GCC, use the -O3 flag. There is a difference in the result between between GCC & Clang vs MSVC when requesting a name of a templated type with a non fundamental type as template parameter. The libraries I'm linking against are: Boost; Catch2; Loguru; CLI11; I suspect that MSVC might use precompiled headers to gain such a speed boost or maybe vcpkg can install precompiled headers for libraries too? Some header-only libraries can May 7, 2024 · c:\Users\protz\Desktop\hacl-packages>clang --version clang version 17. Depth-first Search\n Pre-order traveral\n In-order traversal\n Post-order traversal \n Sometimes a program is a lot faster when compiled with GCC, sometimes it's a lot faster with clang. Modules support is pretty buggy in clang and gcc (I haven't tried msvc modules). 8. clang-tidy can be easily used with Visual Studio via the Clang Power Tools extension. gcc/clang have a few hundreds optimization flags, msvc essentially has /O0, /O1 and /O2 (and a handful of others). 3X for Visual Studio 2022 releases, see MSVC Toolset Minor Version Number 14. It's hard to say why one compiler would be better than the others. I leave it to Scons to eventually implement it. Additional context Commit 05a2295 VS 2022 17. To reduce the frequency of required reboots when updating VS (and VS Previews), we "lock down" the Visual C++ Redistributable containing the STL's msvcp140. 3 I'm working on a macro heavy C firmware project and am having issues with nested macros that fail to correctly Feb 5, 2021 · the cmake thing compiles everything as clang, which is not right - it is supposed to do driver. xz are cross compilers, that can be run on Linux, compiling binaries for any of the 4 target Windows architectures. com/ArashPartow/math-parser-benchmark-project If you rank the resources contributed to each compiler ecosystem, MSVC comes top, then GCC + libstdc++, then clang + libc++. If there are real bugs found by msvc (or tools that only work with msvc), it would be good to list them in this brainstorming issue. For building the library, we use the latest version of CMake. /FS flag is required when building using Ninja generator and MSVC to avoid concurrent pdb . ) Approximately twice a year, specific VS Previews will be "unlocked", so the VC Redist will contain updated DLLs. Detailed instructions can be found in GitHub's documentation. 0, and icx-cl form oneAPI 2024. And to provide maximum parallel construction performance. but i dont want to use clang, when toolchain is msvc ,there are some problems compile_commands changes to this clangd starts to show errors and exchange the line 1 and line 2 iostream cannt be found The goal of this project is to understand programming idioms of Rust, and roughly measure Rust performance compared to C++11. However, we suspect that it is not yet supported when Clang targets Windows, because MSVC didn't support it. . the title of the -reddit- post, its pretty clear that the blog isn't talking about a general statement. It would be interesting comparing clang/llvm vs clang/msvc performance. 5; LLVM Version: 17. You signed out in another tab or window. In short, I tried to configure the following preset with Clang compilers installed by LLVM-Project. Only -Wall or /W3 will be used, unless no errors c rust machine-learning deep-learning enzyme compiler cpp simulation tensorflow ad high-performance llvm automatic-differentiation clang pytorch scientific-computing derivative gradient differentiable-programming llvm-enzyme Used Clang builtins to improve the performance of <cmath>'s floating-point comparison functions for mixed types. Dec 8, 2020 · Just a note: clang-cl. 6: fix fallback path for aligned OS allocation on Windows, improve Windows aligned allocation even when compiling with older SDK's, fix dynamic overriding on macOS Monterey, fix MSVC C++ dynamic overriding, fix warnings under Clang 14, improve performance if many OS threads are created and destroyed, fix statistics for The GitHub Releases page contains prebuilt toolchains that can be downloaded and installed by just unpacking them. exe and IntelliSenseMode to windows-clang-x64, IntelliSense still doesn't work. This issue is to track configuring IntelliSense for clang/clang-cl on Windows, such that the language features of the compiler are accurately reflected (both MSVC and Clang/gcc extensions). Change the project properties toolset to LLVM (clang-cl), this will compile my code using clang-cl Oct 16, 2022 · Brief Issue Summary This issue is related to this topic on CMake Discourse. 25 or MSVC Feb 26, 2024 · clang/gcc have -fno-semantic-interposition which can't be mapped to msvc - interposition is a linux-only property. vmulps ymm1, ymm2, YMMWORD PTR [rax-256] vaddps ymm3, ymm1, ymm3 Could somebody please explain to me if and why these two solutions could give such a big difference in performance? Despite MSVC using one less instruction it ties the load to the mult and maybe that makes it more dependent (maybe the load can't be done out of order)? I am counting out the static analyzers in MSVC and Clang, as it wouldn't be fair to compare it to GCC's lack of one. Sep 7, 2021 · The issue can be reproduced using the i686-pc-windows-msvc and the x86_64-pc-windows-msvc toolchains. ") zapcc is a caching C++ compiler based on clang, designed to perform faster compilations. 17. BENCHMARK: Lua vs vs LuaJIT vs C (MSVC, GCC, LLVM) vs Java vs Perl vs Javascript vs Python vs C# (. 65GB/sec instead of 11GB/sec on the same machine, with MSVC Clang) If anybody is able to look into that. Some software only supports MSVC on Windows (e. Here is a link with more information: Skip to content Download and install llvm-msvc from the following repository llvm-msvc_X86_64_installer-PDB. the compile_commands. Mar 26, 2018 · The CXX ID is reported as Clang (it is clang after all) but I don't want to be using Clang flags, I actually want to be using MSVC flags since clang-cl is designed to be a drop in replacement for MSVCs cl - and hence only accepts MSVC style flags. 0 on windows. There are approximately 200 active bugs in the STL's Microsoft-internal database; we need to manually replicate all of them to GitHub issues. k. Note: This tries to be a simple and robust CI setup that is a The Windows Clang installation is used to build all libraries. I see now in MSVC. If I manually fix compilerPath to clang-cl. Jun 20, 2023 · I was implementing an idea from the following blog post and the followup discussion on Reddit so as to enforce that any CRTP derived class would implement the interfaces the CRTP base class relies on. \n. Windows tools. a. exe). Consider the following: class MyClass { }; template < typename T> struct Templated { }; I've proposed a PR (#10) that allows to compile on MSVC. I might be so bold to add: it is clang 10. Simple <stdatomic. 11 preview 3, I do have MSBuild support for clang-cl installed. Host and manage packages Contribute to owent/libcopp development by creating an account on GitHub. The cmake configuration works and builds. Create a Git commit. libc, which determine the "env" or "abi" part of the target triple). Cross toolchain configuration for using clang-cl on non-Windows hosts to target MSVC. exe rather than clang-cl. Compile on both (and also Linux / gcc) to cross reference standards compliance and warnings etc. The results are decent, but some things, like json loads, are much slower (not sure why that is). I use an up-to-date Visual Studio (2022) with the latest ClangCL component (based on LLVM 15). Continuous integration tests build with a recent version of Clang (running on native x86, or QEMU for RISC-V and Arm) and MSVC 2019 (v19. Before releases, we also test on x86 with Clang and GCC, and Armv7/8 via GCC cross-compile. clang. CMake) Git (winget install Git. VMake tools do a great job ad detec Feb 12, 2024 · Possibility of using clang to compile but MSVC as linker I have a Windows project in XMake, I want to change my compiler toolchain to clang, and keep compiling with link. Could you give more details about CLang vs MSVC compilers usage in this project? I guess it would be very nice to compile it with no MSVC set up at all. exe is a clang compiler that understands the MSVC compiler switches. Nov 27, 2019 · (To be precise, the speed-up was about 20% for the compressed version and about 30-40% for the full version when compiled with clang, and I think these are probably more relevant numbers as clang currently optimizes the code better, which means the amount of improvement for the case of msvc might decrease in the future. But then MSVC already does, so what would be the point of that. , plus MSVC tends to work better in the VS debugger (clang-cl often says "symbol was optimized out" even in -O0 debug build). Contribute to yaruopooner/ac-clang development by creating an account on GitHub. zapcc is the client while zapccs is the server. To see the list of checks in the command-line version, run clang-tidy -list-checks in a developer command prompt. ) Jul 3, 2024 · I still need to test building with clang, but I expect not much difference, since clang uses the MSVC backend on Windows. 16299 VS Code Version: 1. Is link. If a developer or a group of developers is exclusively using GCC then the program can be expected to run slightly faster with GCC than with Clang, and vice versa. With clang I manually changed the property pages, with icx-cl I used the built in VS extension to switch. auto-complete + clang for MSVC. Based on the CMake toolchain file of the LLVM project Absolute path to the folder containing MSVC headers and system libraries. Open a pull request to the upstream repository on GitHub. Apr 24, 2018 · I also ran performance with master built on MSVC compared to my branch on clang-cl with computed-goto enabled (I wasn't sure if there are other things that may be possible to turn on, computed goto seemed an obvious win). You signed in with another tab or window. (I haven't verified the issue using the beta nor nightly channels, nor have I tried any other architectures). clang_getDiagnosticSpelling in C, vs. Both the build and the benchmarks run inside Docker, so they should be portable to Json-Performance Here's a few benchmarks on a few common operating system/compiler platforms. Poor performance of Apple Clang vs. The version of your MSVC or Windows 10 SDK may differ depending on when you installed the Build Tools for Visual Studio 2019. Translates VC project and build settings into gcc-friendly command line arguments, along with existing platform tools (MSVC Linker, Librarian, RC) to complete the build chain. exe. 2. 4GB/s, so there might be a link. We build IWYU regularly against Clang mainline to detect and fix such compatibility breaks as soon as possible. 6GB/s and MSVC 2019-compiled simdjson parses at 1. c is the only changed file anyway. when the toolchain is clang,clangd work correctly. 7. use make check-clang-ast to only run Clang's AST tests. clang/gcc have -gdwarf-5 which can't be mapped to msvc, as it generates pdb debug-info files and not dwarf. on Windows, we have -msvc vs -gnu (vs -gnullvm); on Linux, we have mainly -gnu vs -musl, (there are many other environments too, mostly for specific hardware or embedded systems, such llvm-msvc is a compiler based on LLVM that isn't limited by MSVC. It uses Vcpkg for installing dependencies. It is several times quicker than the LLVM lld linker, the second-fastest open-source linker, which I initially developed a few years ago. Mar 25, 2021 · Another thing to look at is CPU core count vs memory usage. Oct 7, 2021 · I have improved to build c++20 modules for clang/msvc and add support for gcc-11. 0 Preview 4. MSVC STL is working on a performance update for their std::isfinite at microsoft/STL#4609. Bug Summary: When using IntelliSense mode clang-x64, IntelliSense doesn't recognize Microsoft integer suffixes (which are used in the Windows SDK), however it works when using IntelliSense mode msvc-x64. Feb 17, 2022 · figure out a way to tell in the doc that the default optimize flag should be "Speed" or saying that the one that enables the most optimization opportunities is Speed as msvc, GCC and clang will use O2; figure out a way to say that Full is probably not what you want and that it is not enabling all optimization on all platform. The good news is that this issue is fixed, as previously broken tests that call the MOCK_METHOD macros now work with clang-cl 10. 2) Fresh checkout with no prior builds I am pretty sure that this is the same behavior that I have experienced before, on VS 2019 and Windows 10, but there may have been other factors affecting the linking time and resetting it with subsequent builds. Apr 29, 2021 · Our release tests do include building the whole project -- including compiler -- with -fno-rtti -fno-exceptions on GCC and Clang, and verifying that that all works. We are using the Buildtools from VS 2019, either the MSVC toolchain or the LLVM / Clang-cl toolchain packaged with Visual Studio. Oct 4, 2019 · This week we built a local copy of google test based on the newest commit available in gtest master branch (356f2d2). For this purpose several well known algorithmic problems were considered. #4751; Streaming a small bitset to a basic_ostream now avoids dynamically allocating memory. json at almost half the speed of ClangCL-compiled simdjson, on the same machine, in the same command prompt. 2022-04-14, v1. If you're a programmer who just wants to use the STL, you don't need this repo. This repo is for experimenting with building cross-platform C++ in Visual Studio (with an emphasis on module-based code) across Windows and Linux and across the big three C++ compilers: MSVC, GCC and Clang. 6. json is created and works fine. This tool helps to aggregate time trace reports from multiple compilations, and output "what took the most time" summary: Mar 3, 2019 · Without __vectorcall, GCC, clang and MSVC agrees on the calling convention. Also, the difference between O0 and O1 is more than 300%. On GCC and Clang: Performance of std::unordered_map was about the same as flat maps and effect of reserve() was much smaller than in MSVC. 28, running on native x86). View full answer Replies: 5 comments · 8 replies Sep 20, 2016 · As Far as I know clang-cl just wraps calls for clang so I guess that performance would be the same as compiling wih clang directly. Clearly AddIn for Visual Studio 2013 that allows use of the Clang 3. We're going to use GitHub issues to track all of the things that we need to work on. #2314 Fixed a bug affecting older CPUs where the STL generated the newer tzcnt instruction instead of the fallback bsf instruction. anything involving "Sema" diverges-from:gcc Does the clang frontend diverge from gcc on this issue diverges-from:msvc Does the clang frontend diverge from msvc on this issue and removed clang Clang issues not falling into any other category labels Nov 8, 2024 Mar 8, 2024 · Initially supported for MSVC only; will be supported for Clang after it implements consteval (see Clang's C++20 status). Compile your project. Also, gcc has the proper coroutine support header but limited optimisations, while clang has powerful optimisations for coroutines but doesn't work with the libstdc++ header and the libc++ header is still under the experimental subdirectory last time I checked. 40. On the same machine and OS, WSL g++ 7. Feb 27, 2023 · Let us compare their performance characteristics with a fast string transcoding library (simdutf). Ninja) MSYS2 (winget install MSYS2. Clang lists this as supported in Clang 9. dll. Select "MSVC v143 - VS 2022 C++ ARM build tools (Latest)" in the VS Installer if you would like to build the ARM target. Packages. Jul 7, 2015 · CMake will be very nice once clang-cl or clang c2 is ready. Windows 11 Building with MSVC does work. Contradicting information is found online regarding the performance of MSVC vs Clang, some claiming a performance benefit of multiple times in one way or another. 0 100 200 300 400 500 600 700 800 GCC GCC 32 ICC ICC 32 CLANG CLANG 32 GCC O0 O1 O2 O3 Nov 25, 2020 · Brief Issue Summary We have a Windows C++ application build with CMake. It can be used directly from CMake. I will abstain from parallelizing the build: I use default settings. zapcc uses in-memory compilation cache in client-server architecture, remembering all compilation information between runs. #4818; Slightly improved performance for Clang ARM64 <atomic Oct 11, 2020 · VS 2019 16. 26. The layout of the folder matches that which is intalled by MSVC 2017 on Windows, and Feb 25, 2020 · Unfortunately, not using a Clang IntelliSense mode will cause squiggles for valid use of clang/gcc language extensions. It seems I've found a solution. ClangCL parses at 1. 36. GCC is for people who don't mind spending 4 hours at the computer making it work properly. Visual Studio 2019 or 2022; Clang 16 or later (winget install LLVM. I haven't tried clang on Windows, but from what I understand, IntelliSense does use clang internally to some extent, so maybe it's not a bad idea to try it. h> implementation for MSVC in Visual Studio 2019 - zenny-chen/simple-stdatomic-for-VS-Clang Apr 4, 2023 · but here is a problem when toolchain is msvc. Dec 10, 2024 · Good point. Preprocessor mode adds 20% to initial build on msvc win (with PCH). This is the official repository for Microsoft's implementation of the C++ Standard Library (also known as the STL), which ships as part of the MSVC toolset and the Visual Studio IDE. Platform Overall Stage 1 Stage 2 message(WARNING "Old versions of WindowsToolchain incorrectly used 'VS_TOOLSET_VERSION' to specify the VS toolset version. g. CPython, including native modules) so you may have to use it. This is the solution that requires less disk memory of all. Jul 6, 2010 · Benchmarks telling that there is a significant performance gap between GCC and Clang are coincidental. Contribute to dacap/visitlab development by creating an account on GitHub. Personally I like GCC and Clang/LLVM more because of better portability for Linux or MacOS for example, and that I personally think that both GCC and Clang/LLVM give better diagnostic messages about Nov 7, 2019 · Update Clang & build MSVC LLVM with it This is a general update of our builders to Clang 9, and then it also attempts to tackle a bit of #66192 by building LLVM for rustc with Clang, not with the system `cl. 9 will support [[no_unique_address]]. exe and so on. You also get way better and faster intellisense. (surprise) 🥳 Secondary Redis storage backend (remote-only=false) add 3s to the initial ccache build. I guess the only portability issues or bugs were found by using the msSTL, so using clang+msSTL should be fine. Preprocessor mode adds 1-4% to initial build on Linux (with PCH). 1; C/C++ Extension Version: 1. Sep 10, 2023 · Can you ctrl+click on <source_location> and take a screenshot of what the header's contents (just the first page seen in the editor) looks like?. Here we see that Clang performance does not improve with O2 and O3, but slightly decreases. Even at -O2: Clang's loop unrolling attempts at -O2 are more aggressive than GCC's loop unrolling attempts at -O3. This functionality is being deprecated - please use 'VS_PLATFORM_TOOLSET_VERSION' instead. This includes C++20 features, LWG issues, conformance bugs, performance improvements, and other todos. When you switch toolchains in XMake to clang, it will use the llvm linker, whil Aug 31, 2024 · If it doesn't, try making a clang-tidy violation such as removing & from a auto& or adding a comment with only // TODO, then press F1 and restart the clangd server. Also, CodeChecker is available as a front-end to clang's static analysis. Jul 21, 2020 · The c++ code compiled by clang runs a lot faster than the same code compiled by MSVC. We measure two aspects of the compilers’ performance: Jul 5, 2024 · In summary, giving up on MSVC and moving to Clang would streamline development, enhance security, and align Microsoft with industry standards, ensuring continued innovation and competitiveness. 0 Target: x86_64-pc-windows-msvc Thread model: posix InstalledDir: C:\Program Files\LLVM\bin Install chocolate (that's necessary to install Ninja (which is necessary to build with clang 😵 )) Nov 7, 2011 · If MSVC works, it hella works! If MSVC doesn't work, it HELLA DON'T WORK. So, #1363 is commenting out all of ou While testing out #1422, I noticed we get a huge performance boost on OSX/Clang while using the -O3 flag. If you're on Windows often enough it's useful to how to use and operate the MSVC toolchain (via vcvars. Git) Ninja (winget install Ninja-build. Dec 15, 2019 · These days there are few differences between compilers (MSVC, GCC, Clang/LLVM). Nov 17, 2023 · To reduce the frequency of required reboots when updating VS (and VS Previews), we "lock down" the Visual C++ Redistributable containing the STL's msvcp140. also the blog post disproves what you are saying: compilers / optimizers DO touch intrinsics, otherwise there would be no difference between clang and msvc codegen at all for this code base. (Most of the STL is header-only, so most changes are unaffected. When talking about optimization, and "reliability", Clang wins because of the LLVM. However, the Cmake --debug vs --release flags seem to have no impact on performance. exe thing going on there. We build CUDA-enabled TensorFlow with both compilers and run some benchmarks from this repo. a few visits to godbolt would also tell you this. Apr 17, 2023 · @barcharcraz says "not now / not yet" for using such intrinsics for Clang, as they would need to match MSVC's atomics ABI, and we need to fully understand any ABI compatibility issues that could arise from use of the Clang intrinsics. Clang's analyzer's default options are good for the respective platform. 40 in VS 2022 v17. LLVM) CMake (via Visual Studio or winget install Kitware. 5-compiled simdjson parses at 2. 42. While GCC and ICC only have at max 50% increase in runtime between O0 and O1. For more information about some ways in which this affects projects that assume that MSVC versions are all 19. The -ftime-trace compiler flag (see blog post or Clang 9 release notes) can be useful to figure out what takes time during compilation of one source file. NET 8 SDK and can be built simply with dotnet build -c Release . 32532, vs 2022 (17. Sometimes this has a huge payoff. The benchmarking code is located in benchmarks . In MSVC-based Clang, between LLVM/Clang and Visual Studio ClangCL, the final decision is probably the IDE. Compare performance of std::visit vs switch/case. It also functions as a useful testing ground for evaluating support of various different C++ Nov 14, 2024 · the difference is not in the C compilers per se (clang vs gcc), it is the C runtimes (a. See the testing process for details. GCC is a set of the full compiler, where Clang isn't. Dec 13, 2022 · This also helps us with vendor forks of clang on other platforms. 6, v2. The aim is to provide the same experience as MSVC on Windows. Not only install, but also buy because MSVC toolchain isn't free under certain circumstances. 10. Oct 25, 2023 · VS Code Version: 1. 0 part of Visual Studio 2019 installation; It is used by MSFT teams regularly; it is also fully C99/11/17 conformant compiler unlike cl. We will talk about PGO pros and cons, obvious and tricky traps with PGO, and take a look at the current PGO ecosystem from different perspectives (programming languages, build systems, operating systems, etc. h, in order to avoid regressions in clang-cl. They can also be called via clang-check and clang-tidy from the LLVM-based Tools. Clang C/C++ build analysis tool when using Clang 9+ -ftime-trace. Another update/extension - with WSL2/gcc using 10 CPUs / 8 GB RAM and Ubuntu 24. My rule of thumb is 2GiB per CPU core is needed for Clang (at least when using Unity files). Aug 26, 2022 · Is it possible to configure/build STL for compatibility with a version of Clang earlier than 14? (Or for an earlier version of MSVC, for that matter?) Our project is tied to a specific version, and On Windows, simdjson compiled with MSVC parses twitter. NASM Contribute to microsoft/clang development by creating an account on GitHub. Apr 24, 2020 · getting rid of the need to manually install the MSVC toolchain. exe the only used component from MSVC currently? If this change allows to get rid of MSVC completely so only free Windows SDK is required, it is a very strong reason to move The current state, using MSVC and Clang hybrid is sort of OK for me now. Nov 11, 2024 · Remember that the subdirectories under test/ create fine-grained testing targets, so you can e. MSYS2) NASM (winget install NASM. In the following benchmark, there's a very noticeable difference between results built with msvc and clang: https://github. Select "Windows 11 SDK (10. 3 Target: x86_64-pc-windows-msvc Thread model: posix InstalledDir: C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\Llvm\x64\bin c:\Users\protz\Desk This repo contains a set of scripts to compare nvidia's CUDA compiler (nvcc) and clang (that has built-in CUDA support). Create your Windows driver project and choose "LLVM-MSVC_v143_KernelMode" as your platform toolset. bat). Although feel free to try it out on more and let me know if you do/what scores you get! Include-what-you-use makes heavy use of Clang internals, and will occasionally break when Clang is updated. Mar 26, 2023 · I just rebased the llama-patch-enable-fma-msvc to master for easier testing, however only the ggml. GCC or Clang or MSVC Visual Studio 2019 C++ 16. Tomorrow I will uploaf my changes. clang_msc_ver (default: auto-detected): MSVC version clang-cl will report in _MSC_VER. Nearly identical to the Clang C APIs, e. To figure out what version you have installed check the following directories Jan 30, 2021 · What could be the reason for this major performance difference? MSVC: ~36 seconds GCC: ~1:10 minutes. In addition, I implemented code dependency scanning and automatic analysis between modules, so as to realize module dependency compilation. The issue has been reproduced using the VSInstr tool that ships with VS 2017 as well as VS 2019. ). Jun 11, 2012 · Clang built with MSVC using MSVC libs/tools under MSYS will allow to build autotools projects in a MSVC-compatible way, which is one of the reasons Clang is awesome. getDiagnosticSpelling (notice the . GitHub Gist: instantly share code, notes, and snippets. I tried to get the msvc build going but I could not even get past the libuv stage. Simply install the Visual Studio IDE Aug 29, 2023 · From my experience, MSVC almost always wins in performance over MSYS2, mingw, cygwin, but it comes with it's downsides like inconsistent implementation of some parts of c/cpp standard library. And that unsurprisingly exactly matches C++ 20 and especially 23 implementation progress. 11 (Apple clang) I get twice the performance of std::to_string() for double! But on MSVC 2015 and 2017, the performance is typically slightly worse than std::to_string() , typically ~120% of the execution time. Jul 28, 2022 · There are lots of computationally intense things in the project so I wanted to use clang-cl to try to improve performance (ex. Click to expand { "ve If there are other dependencies of the project that rely on libstdc++ runtime that have to play together, Msys2 MinGW Clang is probably the way to go, but otherwise, it seems that Msys2 Clang with libc++ could be the way to go. 04, the numbers are very similar (all dependent on cooldowns/throttling): For MSVC, use /std:c++17, and also /permissive-to ensure standards conformance. You should generate the random input once and use it everywhere to improve consistency and exclude the time for random number generation. P1502R1 #1567 #1692 Standard Library Header Units Initially supported for MSVC only; will be supported for Clang after it implements C++20 modules (see Clang's C++20 status). 5 C/C++ compiler in place of MSVC++. I know this doesn't exactly map to the [[msvc::intrinsic]] attribute but it gives us the same facility in clang including cl mode for the std meta functions and is easily wrapped behind a macro which we already have to do anyways to support VS2017-VS2022. However, MSVC has a template parsing model that delays nearly every lookup to instantiation time, which is part of phase 2. Jun 12, 2024 · According to LLVM/clang documentation, clang-cl aims to be ABI compatible with MSVC on Windows but this doesn't appear to be the case. Each zapcc run will reuse an existing We're going to use GitHub issues to track all of the things that we need to work on. GCC uses its own IR generation where Clang uses LLVM IR. h> and <threads. We don't want to break ABI by accident. You switched accounts on another tab or window. Too bad I cannot compile Godot c files with it as webp drver seem to require SSE3 (even if mingw has -msse2). c (plus three other files) and then link, using visual studio compiler. Brief Issue Summary When using ninja as a generator and when you change the configure preset it will automatically detect that ninja and cl are not in the path and it will load the appropriate vcvars, which is expected. if you where not so quick to point out you're Dec 4, 2024 · When building with cmake, Ninja, and MSVC (instead of Visual Studio generator), then clangd can't find the needed path. So I rewrite the main calculation part by using AVX Intrinsics code. cpp that /permissive-only translates to -fdelayed-template-parsing (via /Zc:twoPhase) and -foperator-names, so I could exclude /permissive-from my clang-cl build and only include the bit that I want. This delay is why your example would compile with MSVC(which is non-conforming) and not in clang. In principle, when compiled with clang/MSVC, one could generate two versions of the same function since their symbol do not conflict. Feb 16, 2012 · Clang is fairly strictly conforming to the two-phase name lookup. In addition reserve() had major effect on the results. NET CLR, Mono) vs Ruby vs R - DNS/benchmark-language You signed in with another tab or window. 0. P1614R2 #1602 #1678 Adding Spaceship <=> To The Mar 25, 2024 · depend_mode=true is 1-4% faster on msvc. tar. Once it's done indexing, you will see violations highlighted in vscode. #4648; On x64, atomic_ref<16 bytes> now always uses the cmpxchg16b instruction. This needs to come without __vectorcall (and with the performance penalty) if GCC is to be supported with the same binary. Feb 14, 2020 · Type: LanguageService OS and Version: Windows 10 Enterprise 10. On Linux (gcc-6, gcc-7) and MacOSX 10. POSIX toolchain This is the default toolchain for POSIX operating systems, which is used for all POSIX systems that don't have special toolchains. Their clang tool however seems incomplete, or maybe I just failed to register Windows SDK as a tool. 83. MSVC not inclining functions in the Eigen math library). Enter checks to run in the Clang-Tidy Checks property. h>, <stdalign. 1 C/C++ Extension Version: 0. snmalloc tends to do better in very asymmetric producer consumer allocation patterns, but again it is very much down to the benchmark. I will play around with it once it is released. pwmess ynqoey zbmxu fib mhcpkk esuqcy cdpn gam llfyb dsmpl