Clang vs msvc performance 2022. Knowing that GCC is one of the most used C++ compilers.

Clang vs msvc performance 2022 you can make VS invoke clang-tidy with a list of checks. MSVC is not in the list. I build my project in RelWithDebInfo mode, and MSVC_x64_x64 toolset. Performance is one aspect, but I'd highly recommend supporting multiple compilers for their warnings/safety features. Clang vs MSVC: Treatment of template function prototypes. So, with MSVC, your define does seems to work. clang and g++ are correct. exe) is the "official" compiler for Windows made by Microsoft themselves. This effectively breaks all intellisense regarding C++23 features. Posted on April 1, 2020 March 24, 2020 by David. I am trying to generate Visual Studio 2022 project files using CMake and the clang compiler. loop unrolling). I've looked online and in man clang which only gives general information (-O2 optimises more aggressively than -O1, -Os optimises for size, ) and also looked here on Stack Overflow and The question at hand is which compiler, Clang or GCC and MSVC, is correct when it comes to accepting or rejecting a program that uses the new keyword. I know both of the two ways use the same compiler: clang 3. 1,679 2 2 gold badges 11 11 silver badges 26 26 bronze badges. Executing performance gap between GCC and Clang. -B build -G &quot;Ninja Multi-Config&quot; -DCMAKE_C_COMPILER=clang - Clang also comes with a lot of handy code analysis tools like clang-format and clangd. Know the Context. I'm using VS 2010 and see the compiler generating a "jne" when using a normal if. #1897 #1955 #2035 #2091; Toggle table of contents For those wondering how the recent releases of the Clang 16 and GCC 13 are competing for the fastest generated binaries of these leading open-source compilers, here is a fresh round of benchmarks from an Intel Core i9 My purpose in making this post, is to find out if anyone has specific experience with particular constructs that MSVC has problems with, so that I might express my code in a different way, perhaps using `#ifdef` to write something specifically for msvc, to help the compiler and close the gap between the msvc and clang performance. For comparison, my M2 Max 8/4 takes 780s to compile. MSVC's detailed info (implemented in VS 2022 17. Full IntelliSense is supported along with Visual Studio’s comprehensive debugging support. Stack and with this addition I can choose "Debug->Performance Profiler->Target:{my exe}+CPU usage Each has a unique design philosophy and architecture that caters to different needs and preferences. I am using C++17. Page 1 of 3: 1: 2: 3 > Thread Tools: clang vs msvc vs For gcc, the manual explains what -O3, -Os, etc. 6 How to install Clang from the binary distribution? 2. This has highlighted to me that clang is capable of Not at all, it's just a micro-optimization library that Agner Fog provides. Clang is fairly strictly conforming to the two-phase name lookup. clang vs msvc vs mingw - C and C++ Hacks and Cheats Forum : UnKnoWnCheaTs - Multiplayer Game Hacking and Cheats; Anti-Cheat Software & Programming. This is basically equivalent to a virtual function call, but Description. Of course, there are 128-bit AVX but here is a problem when toolchain is msvc. However, MSVC has a template parsing model that delays nearly every lookup to instantiation time, which is part of phase 2. And graphics stack in linux is getting better year at year. Clang also comes with a lot of handy code analysis tools like clang-format and clangd. [temp. With both GCC and LLVM Clang, the benchmarks were carried out three times with varying CFLAGS/CXXFLAGS. Improved performance: Optimized basic_common_reference; it was unintentionally relying on identical bugs in MSVC and Clang, but EDG correctly diagnosed that the code was non Also updated _MSVC_STL_VERSION to 143 for the VS 2022 release series. So you may use clang in your VS. 3/v143 from VS 17 2022, but can be changed using other version : Visual Studio ClangCL _M_X64 __x86_64__ _MSC_VER=1933 __clang_major__=14 _MSVC_LANG=201402 To decide between the MSVC based Clang flavors (LLVM/Clang and Visual Studio ClangCL) and the Msys2 based ones, the decision It might still be acceptable for many use-cases, but notice that clang uses 1-uop vpmaddwd on 32-bit integers that were zero-extended from 8-bit, vs. Clang is supported in Visual Studio by installing the Clang compiler. When these constructs are present in widely included system headers, Clang attempts to recover and It's worth noting that the MSVC libstd headers don't always play nice with Clang due to mainly being targeted at the MSVC compiler. fct]), then the template-parameter is a template parameter pack. On Linux your main options are GCC and Clang. 2. If a template-parameter is a type-parameter with an ellipsis prior to its optional identifier or is a parameter-declaration that declares a pack ([dcl. Namely, clang 13 and gcc 11. For ARM the situation is ambiguous, often Clang optimizes better. Used Clang builtins to improve the performance of <cmath>'s floating-point comparison functions for mixed types. 1 23 P2273R3 constexpr unique_ptr VS 2022 17. If you knew what CPU you're compiling for, you could cut out the dynamic dispatch and just call the function for that extended arch you're targeting. 3. I need to write some addon for NodeJS. 2, LLVM Clang 17. 0 as the new Znver4 release of the AMD Optimizing C/C++ Compiler and derived from LLVM Clang 14 upstream. BZKN BZKN. StackOverflow post Clang vs GCC - which produces faster binaries? Benchmarking LLVM & Clang Against GCC. Visual Studio 2019 version 16. exe /Zc:preprocessor compatible mode. The _HAS_CXX23 macro is not initially defined when using LLVM/clang-cl in Visual Studio 2022. For example, following code: compiled well with clang/gcc (unix or Performance difference was about ~15% which was very noticeable in that application. About; Products OverflowAI; I'm trying to use Visual Studio 2022 and its profiling tools to profile my C++ app, built with a CMake project. I am performing feature matching process using OpenCV - 4. sln file: > mkdir build && cd build > cmake . Distinguish between Clang CL and MSVC CL. – Peter Cordes. Visual Studio 2019 includes out of the box support for editing, building, and debugging CMake projects with Clang/LLVM. 0 benchmarking against the open-source LLVM/Clang and AOCC compilers. If you prefer, Microsoft makes available ClangCL which 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. Now, when you can use MSVC with clang as the compiler, that might be reason to stop using GCC. You can download Visual Studio 2022 from the Visual Studio downloads page or upgrade your existing installation by following the Update Visual The _MSC_VER by default is 19. 8. However, some compiler-dependent features such as Edit and Continue aren't available for Clang configurations. 14 with Performance Improvements and Visual Studio 2019 The __popcnt intrinsic mentioned above doesn't work on ARM, or even all x86 CPUs (it requires ABM instruction set). 0 Target: i686-pc-windows-msvc Thread model: posix InstalledDir: C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\VC\Tools\Llvm\bin Moreover, I simply use the following command: cmake -T ClangCL to generate the project on a Windows 10 PC with Visual Studio 2019 The project property pages for a Clang configuration are similar to the ones for MSVC. -G "Visual Studio 17 2022" -T ClangCL -A x64 What can be a reason for such significant performance difference? [Notes] Feature Extraction is run before, and all the features are stored in RAM (a lot of data but there is lots of RAM available inside machine) For Windows code is compiled using MSVC. 0 (ships with VS now) This works fine for us with MSVC cl but clang-cl is checking to see if the c++; clang-cl; Also VS 2019 is locked into clang v12. But yeah, you don't really have to worry about it unless you'll make a really CPU-intensive program that uses all cores. But for some workloads there were significant differences between the compilers: This is a problem with MSVC. To use the Clang compiler the clang-cl compiler is called during compilation instead of the cl compiler. For more information about some ways in which this I’ve a question about using Clang with MSVC. @SujayPhadke - reified: to make real; a fully realized implementation; to take something abstract and make it concrete. This is good for performance (in a typical case), but awful if you want to do some source-level optimization (e. Commented Feb 3, 2022 at 0:59. GCC is for people who don't mind spending 4 hours at the computer making it work properly. 3 Template by method pointer in clang I know that one uses libstdc++ and other use msvc standard library but what difference does it make when i compile the following without linking int add(int a, int b) {return a + b;} is there is any 2022 at 15:47. static. 5 23 I'm wondering about std::variant performance. 10. When should I not use it? It seems like virtual functions are still much better than using std::visit which surprised me!. And I checked the ASM code, found out that clang automatically uses SIMD Windows users have choices when it comes to C++ programming. To create a C project in VS with clang- Here is that more extensive round of AOCC 4. MSVC 2022 + clang-cl from LLVM-12 (official installer) The default build CMake options: But if you carefully pick your data and compare different compilers, you can get a performance boost of more than 40% compared Clang Power Tools is a Visual Studio extension helping Visual Studio C++ developers leverage Clang/LLVM tools (clang++, clang-tidy and clang-format), in order to perform various code transformations and fixes like modernizing code to C++14/17/20 and finding subtle latent bugs with its static analyzer and CppCoreGuidelines checks. If you take a look at the documentation for his library, he explains that he uses a dynamic dispatch pointer to determine which implementation of the function to call. 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 But unlike GCC, MSVC lets you use intrinsics without needing to compile with any -march=haswell equivalent to "promise" that you'll only run the binary on CPUs that support some instruction-set extensions. This article explores the fundamental design differences between GCC and Clang, highlighting how these differences impact their functionality, performance, and usability. 12 release, and based upon feedback received from the community, the MSVC compiler team would like to provide greater visibility into the C++ language-level fixes for customer-reported issues that made it into the release. 3D engines or high performance scientific code. VS 2022 17. I'd assume this is some quirk in MSVC's non-conformant name lookup behavior. The difference is how they use it. You may choose to stick with the regular Visual Studio. Compile Score. However, I don't know what the difference is between them. Download. Or it's better to use the MSVC (VC++) on Windows and GCC on Linux and use CMake to handle with the independent compiler? pitfalls of compiled executables comparing to manually line-by-line rewritten libs code to compile them on Windows in MSVC? I need high-performance code which uses Also VS 2019 is locked into clang v12. MSVC allows many invalid constructs in class templates that Clang has historically rejected. 40. Various reports online show a 2x or more execution speedup in benchmarks moving from v12 to VS 22 v15, and now it's VS 22 v17. By editing your GCC usually produces faster code if you target x86/x86-64. C and C++ [Discuss] clang vs msvc vs mingw: Save: Authenticator Code. I am trying to get decent performance out of MSVC for this code. Context. Clang: namely "When constant-time source yields variable-time binary: Exploiting curve25519-donna built with MSVC 2015". Updated Clang to 18. GCC performance was quite close, as we've come to see over the years on various AArch64 single board computers and server platforms. exe preprocessor, and I found no way to switch it to clang native preprocessor or cl. But now it means "do this only for gcc and clang". Clang Power Tools for In short: Clang is correct (though in one case, for the wrong reason). One of the main benefits of using Clang in Visual Studio 2022 is the improved performance and memory usage that it offers. 03: Clang vs. A lambda-expression whose smallest enclosing scope is a block scope (6. See results below. -G "Visual Studio 16 2019" -T ClangCL -A x64 or > mkdir build && cd build > cmake . Mimimum Reproducible Example. Unlike GCC/Clang, MSVC doesn't stop you from using intrinsics for instructions you haven't told the compiler it's allowed to use itself. An expression e can be explicitly converted to a type T using a static_cast of the form static_cast<T>(e) if the declaration T t(e); is well-formed, The Clang compiler has generated model executables that are more than 10% faster than using the Visual Studio compiler, however the performance improvement is model dependent. These are typically controlled by -fms-extensions. Let us compare their performance characteristics with a fast string transcoding library (simdutf). Since then I’ve started the Clang version on Ubuntu and there haven’t been too many differences but there are just a few so in this post I’ll list what I’ve found so far 3. As part of the various end-of-year articles, this article is providing a fresh look at the GCC vs. The A bit late to the party, but there doesn't seem to be an accepted answer, so here is another option. Since addon should work on Windows, I need to compile it with MSVC. Hot The first question is whether you are actually using libc++ (clang) or libstdc++ ( gcc, but clang defaults to it on linux). I added this fra Skip to main content. It works, but might not have good performance because the compiler has to be conservative about the state switches if using 256-bit registers. – user18260579. In "A Tour of C++" Bjarne Stroustrup says this about pattern checking after explaining std::holds_alternatives and the overloaded methods:. If GCC installs, it works, and if it doesn't work, it's the IDE's problem. The latest preview brings Clang into the fold. 3. 29 calls the templated constructor. 27 Use Clang with MSVC 2010. Here’s the full list of the compilers we will be working This post summarizes the new features you can find in this release for C++. But after compilation I discovered that addon was slower than original program. 0 Git as of 23 December were all tested in their release form on Ubuntu 23. If you were to set out and design a library to specifically provide a compiler API, with all of the things that compilers do other than just emit machine code, what would it look like? I came across the following statement in the standard:. 0. 3) is a local lambda expression; any other lambda-expression shall not have a capture-default or simple-capture in its lambda-introducer. Context I am developing a cross-platform project that depends on a highly performance sensitive open-source library. Please note that using Clang-cl instead of the default compiler can result in some incompatibility (especially for large codes). I originally created Asteroids for Windows using Visual Studio 2017 Community Edition. Works fine with the /permissive-flag for standard conformance, but doesn't work without it. Knowing that GCC is one of the most used C++ compilers. 2. But I want to use expression block language extensions as well, which is perfectly supported by clang-cl. CMake 3. You usually won't have to worry too much about playing with extra cmdline options other than the ones cs50 has taught you. #ifndef _WIN32 // ignore this in msvc #endif Since gcc has previously been the only non-windows build, this was equivalent to saying "do this only for gcc". C/C++ compile times data viewer and text highlight for Clang and MSVC. However, switching to LLVM clang-cl (via Configuration Properties) results in: There's an article describing some of what Ninja does to achieve its performance in the book The Performance of Open Source Applications. You can try to change various optimization settings and profile your code if you want to achive peak performance. also the blog post disproves what you are saying: compilers / optimizers DO touch intrinsics, otherwise there would be no difference Introduction In alignment with the Visual Studio 2022 version 17. You shouldn't use it directly; instead, if you're on x86/amd64 you should use the __cpuid intrinsic to determine at runtime if the processor supports popcnt. My simulations are roughly 4 times slower using MSVC compared to clang-cl (Tested with 2015 up to preview 2022 and since then i didn't bother any longer testing it; a lot of added load/stores and missing inlines for trivial stuff). Where VS 2022 tracks the latest clang v17. Follow edited Mar 24, 2022 at 8:57. This article explores the fundamental design differences between GCC and Clang, highlighting how these differences It's worth noting that the MSVC libstd headers don't always play nice with Clang due to mainly being targeted at the MSVC compiler. 8 (now required). 3 23 P2291R3 constexpr Integral <charconv> VS 2022 17. the title of the -reddit- post, its pretty clear that the blog isn't talking about a general statement. And as @Cheersandhth says, it's good to use two compilers. GCC is between the two and is typically about 25% of MSVC. Is it possible to trick MSVC into producing better assembly? I've looked at Compiler Explorer but my experiments haven't made much A partial list of new features: MSVC Toolset Update: The MSVC toolset version is updated from 19. Also, clang optimizes away the >>8 into the byte shuffling it has to do anyway to re-pack. Clang x86_64 performance is competing with these new 2024 versions. 04 on WSL 2 to be precise) and depends on the number of images used for the process (more on that later). If MSVC works, it hella works! If MSVC doesn't work, it HELLA DON'T WORK. MSVC is for those who don't care about C and want it to install without any pokin' around. Each has a unique design philosophy and architecture that caters to different needs and preferences. 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. Third, MSVC accepts some C++ code that Clang will typically diagnose as invalid. So this may just be a really slow build of clang that was shipped. Architectural Design Differences – Clang: Clang’s design is highly I have the following simple code and when I compiling them in GCC and Clang there is a huge performance difference between theirs execute times as you can see the results and the versions of the . 0 SDK when running the vs2015 command-prompt. 9 [expr. prim. 125 1 1 silver badge 5 5 bronze badges. Let's start from static_cast (§5. lambda. For your further understanding, please check this: 2024. VC++'s problem is the fact that the parameter type isn't qualified by typename. For the vast majority of benchmarks the LLVM Clang vs. Share. 4 23 P2302R4 ranges::contains, ranges::contains_subrange VS 2022 17. It's probably worth at least supporting MSVC as well, since it is excellent at warning about accidental type conversions. Clang performance of the generated binaries on x86_64. 2024. GCC and clang/llvm, on the other hand, are treated and developed more like infrastructure. Skip to main content. Here is a tutorial. My MSVC 2022 sets it by default with O2 optimization. But when using an else instead, the compiler generates a "je", and puts the else block after the main flow. For those that haven't looked at GCC vs. Stack Overflow. You can set a Clang compiler or linker option that isn't available in the property pages. If you add another, ignored, leading parameter to the LOG_HELPER macro's parameter list, the rest of the parameters get properly expanded by all compilers (even on ancient versions, see godbolt), including MSVC's traditional and new preprocessors. 5x in performance between the best (Intel compiler) and worst compiler (PGI compiler) on our Jacobi solver kernel (bandwidth-limited stencil obscured by abstraction techniques). I'm currently implementing my own CRT using Visual Studio 2022 and clang-cl (12. Afaik the libstdc++ implementation defers to different algorithms based on the iterator type and collection size. MSVC using vpmulld 32x32=>32-bit multiplies that run as 2 uops on Intel. Improve this answer. You can specify the SDK-version by modifying the "VS2015 x64 Native Tools Command Prompt" to force the 8. 1 Preview 2 comes with support for Clang/LLVM out-of-the-box. I dont have low level details about it but i suspect the cause is a combination of better optimization (ej, copy on write memory when fork a process), api exposed (system-v api vs win32) and complexity (linux boxes often run less process at idle state). 2022 at 9:08. Why? The c++ code compiled by clang runs a lot faster than the same code compiled by MSVC. GCC uses a lot of heuristics. But then MSVC's code generator kicks in, so anything related to LLVM is not used. 0 benchmarking comparison the following compilers were tested: - AOCC 4. Paste this into a blank C++ solution project template, such as the C++ console app. So, I don't understand, why MSVC produce so slow program. They're more similar than Clang is to MSVC in my experience, and I suspect you'd have fewer issues trying to switch between them if you get your project to build with one. Ninja does have the parallelism you describe (building object files for project A and B in parallel) but that's probably not one of the more significant sources of whatever performance advantage Ninja has over MSBuild. 4. res]/7: [] within the definition of a member of a class template following the declarator-id, the keyword typename is not required when referring to the name of a previously declared member of the class template that declares a type or a class template. This should however only really matter if you write really performance sensitive code, e. ) I'm looking for the same info for clang. However, for my purposes, I find that clang has much inferior diagnostics (and sometimes inferior code) so I still use GCC as my primary compiler and just use clang as a backup. As part of our ongoing benchmarks of GCC 11 vs. Considering the non-derived case ("Foo") where all compilers agree to call the templated It's quite a straight-forward look in seeing how the GCC vs. 5x in performance between the best (Intel compiler) and worst compiler (LLVM clang compiler) on our Structure Function kernel (highly-tuned code for SKL). g. Clang is designed to be highly optimized, and can often compile code faster and use less memory than the MSVC toolset. 39 to 19. msvc is consistently slower, why is that? Latest LLVM/Clang releases default to using Visual Studio 17 2022, but it is possible to force using other installations by defining the appropriate Visual Studio We will use Windows because it has both GCC (in the form of MinGW or cygwin) and Clang, so on OS X and Linux you can use the same flags with these compilers. Visual Studio has had great tooling for MSVC and GCC for quite a while now. 5. I’m not a new user, I’ve been using them together for years but I can’t figure out where I should post nowadays (some posts here are tagged ‘n’ svc but I guess that’s something different??) It’s a question about DLL integration between the 2 compilers so coul Clang-cl. Just grab the “Clang compiler for Windows,” an optional component of the “Desktop development with C++” workload. For example, Clang does not support some C++17/C++20 features like the parallel STL, polymorphic allocators or some advanced atomic features yet (as opposed to MSVC). Clang with Microsoft CodeGen is using Clang to parse the source into an AST. however, I could not find a way to make it use an existing . – In my view, the difference is that MSVC is (or at least has been historically) a Microsoft product. Even if the compiler is now free as in free beer, Visual Studio is still a business unit, and a rather large one, last I checked. For today's AOCC 4. Those flags included: 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. Linux uses CLANG. 3 (in C++). This fix was backported to VS 2022 17. VS Code is asking me to install Clang: Why I should do that? How to install Clang? Skip to main content. Unfortunatelly, clang-cl. A template parameter pack that is a parameter-declaration whose type contains one or more unexpanded Updated build compiler to VS 2022 17. In answer to Xentrax: Your statement regarding MSVC does not seem to match with my observation. 3 Code compiling on gcc, but not on msvc. answered Mar 24, 2022 at 8:49. This has highlighted to me that clang is capable of Please note that using Clang-cl instead of the default compiler can result in some incompatibility (especially for large codes). Template instantiation and name lookup¶. I use an up-to-date Visual Studio (2022) with the latest ClangCL component It seems like MSVC has been far quicker to support new c++20/23 constructs than GCC or Clang (at least in terms of library features). GCC 13. MSVC is wrong in the first case. Under "Desktop development with C++" also select "C++ clang tools for windows" Click install and clang will be usable to you through the commandline, just like the CS50 terminal. If [] Second, Clang implements many MSVC language extensions, such as __declspec(dllexport) and a handful of pragmas. 0 23, Q P2251R1 Require span And basic_string_view To Be Trivially Copyable VS 2022 17. 1 sdk by adding at to the end of the commandline-parameter like this; "%comspec% /k ""C:\Program In order to maximize performance it is recommended to start with the Release configuration. exe immitates old cl. However, since application performance (program performance) is affected by the choice of the compiler, it completely makes sense that in your case you see GCC performance better than LLVM, however, it's not bound to happen always for every application. 1. This library supports a number of different compilers, but the most performant version is compiled via clang, due to inline assembly which isn't supported by the MSVC compiler (cl). 0 Git as of 23 December, and GCC 14. Or even easier you can use out of the box support on VS2019: On Windows, it’s easy to install the Clang tools. translate to in terms of specific optimisation arguments (-funswitch-loops, -fcompare-elim, etc. 08. This delay is why your example would compile with MSVC(which is non-conforming) and not in clang. 2, LLVM Clang 18. when the toolchain is clang,clangd work correctly. 2 call the copy constructor of Foo while MSVC v19. MSVC (actually the compiler is just called CL. Currently, if I call: cmake -S . On the Apple M1 the performance was close and GCC in good standing. 6) is "void __cdecl cats<class std::vector<int,class std::allocator<int> >> Modules support is pretty buggy in clang and gcc (I haven't tried msvc modules). LLVM Clang 12 given these fresh open-source compiler releases, today's comparison is looking at the Core i9 11900K "Rocket Lake" performance. Here is a link with more information: Visual Studio usually doesn't provide the latest version Note that VS tries to provide the latest version of Clang/LLVM in a timely manner, but we need to wait for the final release version, do installer work and run testing, and then we're subject to the latency in the VS release pipeline (after a change is merged, it takes a while before it appears in a VS Preview, and then more Visual Studio (Desktop) has a clang-tidy integration. VisualStudio extension used to display and highlight compilation profiling data. Overview Q & A Rating & Review. So, after check, I made a conclusion that problem is MSVC. Commented Feb 21, 2022 at 9:56. 12 Preview 2. clang-tidy configuration file. The "DerivedFoo" case produces different results on MSVC than on clang or gcc. I will try to build on Windows using CLANG and give you update >clang-cl -v clang version 12. exe. Let's take a closer look at the code snippet in question: — I stumbled over the following piece of code. Also, AFAIK Clang does not support optimization for code size. In order to parse widely distributed headers for libraries such as the Active Template Library (ATL) and Windows Runtime Library (WRL), some template rules have been relaxed or extended in Clang on Windows. . 4 23 P2321R2 std::zip partial in VS 2022 17. capture]/3 (C++17 draft N4659). This may affect projects that have version assumptions. We measure two aspects of the compilers’ performance: The speed of compiled My JSON parsing code compiled with msvc gets 315 megabytes per second, while the same code compiled with clang gets 412 megabytes per second. cast]/p4, all quotes are from N3936):. The documentation hints that it is possible: Clang-Tidy configuration By default, Clang-Tidy does not set any checks when enabled. I ran into an issue that performance of Matching on Windows is even 30 times slower than on Linux (Ubuntu 22. GCC is wrong in the second case. The performance boost is very minimal, if there even is one in normal cases. I am developing a cross-platform project that depends on a highly performance sensitive open-source library. The optimization settings are under Project properties -> C/C++ -> Optimization: I am having trouble compiling a project with LLVM/clang toolchain in Microsoft Visual Studio 2022, despite having installed the vcpkg LLVM/clang addons for MSVS. Add a comment | Related questions. a successful timing attack against the Kyber reference code compiled with some of the "optimization" options for Clang 15 (released in 2022) or newer. Comparing MSVC vs Clang . My naive benchmark shows clang's executable run time is about 10% of the MSVC's runtime. This is similar to how the standard library team publishes regular As an update for Visual Studio 2019 and 2022, you can install the clang-cl toolchain via the Visual Studio Installer and use this to generate a . Have you tested performance of your clz64? I wouldn't be surprised that all this branching makes it slower than the OP's implementation. Keep in mind that you probably don't want to issue a cpuid for every popcnt call; you'll When you have msvc 2015 and 2017 installed, and trying to build with msvc 2015, it will autodetect the 10. However there are still situations, where I would like to handle something specifically for gcc, and not for clang. Clang benchmarks in recent years, it's very Visual Studio now supports Clang/LLVM for CMake projects and you can now use Clang to target Windows and remote Linux machines. It is a C++ project that compiles/runs fine with MSVS default compiler (v143). Check out our Clang/LLVM post for much more information. From [expr. MAR1 MAR1. nyjfs mdf dya fhtj sbs gtom xuvdb rvcamo xpeaqx exdh