Clang vs msvc performance 2022. Commented Feb 3, 2022 at 0:59.

Clang vs msvc performance 2022 Currently, if I call: cmake -S . 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). 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. In answer to Xentrax: Your statement regarding MSVC does not seem to match with my observation. 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. 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. 2024. One of the main benefits of using Clang in Visual Studio 2022 is the improved performance and memory usage that it offers. Clang vs MSVC: Treatment of template function prototypes. Visual Studio 2019 includes out of the box support for editing, building, and debugging CMake projects with Clang/LLVM. answered Mar 24, 2022 at 8:49. MSVC is not in the list. GCC and clang/llvm, on the other hand, are treated and developed more like infrastructure. 40. The "DerivedFoo" case produces different results on MSVC than on clang or gcc. But when using an else instead, the compiler generates a "je", and puts the else block after the main flow. So, with MSVC, your define does seems to work. You can set a Clang compiler or linker option that isn't available in the property pages. 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. Why? The c++ code compiled by clang runs a lot faster than the same code compiled by MSVC. Also, clang optimizes away the >>8 into the byte shuffling it has to do anyway to re-pack. 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. 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. I originally created Asteroids for Windows using Visual Studio 2017 Community Edition. I build my project in RelWithDebInfo mode, and MSVC_x64_x64 toolset. Page 1 of 3: 1: 2: 3 > Thread Tools: clang vs msvc vs For gcc, the manual explains what -O3, -Os, etc. Clang is supported in Visual Studio by installing the Clang compiler. 0 benchmarking comparison the following compilers were tested: - AOCC 4. But after compilation I discovered that addon was slower than original program. VS Code is asking me to install Clang: Why I should do that? How to install Clang? Skip to main content. 6 How to install Clang from the binary distribution? 2. 1 Preview 2 comes with support for Clang/LLVM out-of-the-box. This delay is why your example would compile with MSVC(which is non-conforming) and not in clang. 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. loop unrolling). Template instantiation and name lookup¶. . So, I don't understand, why MSVC produce so slow program. 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. 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. 4 23 P2302R4 ranges::contains, ranges::contains_subrange VS 2022 17. Context. If [] Second, Clang implements many MSVC language extensions, such as __declspec(dllexport) and a handful of pragmas. When should I not use it? It seems like virtual functions are still much better than using std::visit which surprised me!. 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. You can try to change various optimization settings and profile your code if you want to achive peak performance. Improve this answer. Add a comment | Related questions. 5. clang vs msvc vs mingw - C and C++ Hacks and Cheats Forum : UnKnoWnCheaTs - Multiplayer Game Hacking and Cheats; Anti-Cheat Software & Programming. 3D engines or high performance scientific code. See results below. These are typically controlled by -fms-extensions. In "A Tour of C++" Bjarne Stroustrup says this about pattern checking after explaining std::holds_alternatives and the overloaded methods:. Namely, clang 13 and gcc 11. By editing your GCC usually produces faster code if you target x86/x86-64. 1,679 2 2 gold badges 11 11 silver badges 26 26 bronze badges. Let's start from static_cast (§5. when the toolchain is clang,clangd work correctly. translate to in terms of specific optimisation arguments (-funswitch-loops, -fcompare-elim, etc. MSVC is for those who don't care about C and want it to install without any pokin' around. CMake 3. 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. Clang is fairly strictly conforming to the two-phase name lookup. Also, AFAIK Clang does not support optimization for code size. 0 SDK when running the vs2015 command-prompt. And I checked the ASM code, found out that clang automatically uses SIMD Windows users have choices when it comes to C++ programming. 0. I ran into an issue that performance of Matching on Windows is even 30 times slower than on Linux (Ubuntu 22. It is a C++ project that compiles/runs fine with MSVS default compiler (v143). 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. This should however only really matter if you write really performance sensitive code, e. You usually won't have to worry too much about playing with extra cmdline options other than the ones cs50 has taught you. Let us compare their performance characteristics with a fast string transcoding library (simdutf). Afaik the libstdc++ implementation defers to different algorithms based on the iterator type and collection size. Where VS 2022 tracks the latest clang v17. Since addon should work on Windows, I need to compile it with MSVC. With both GCC and LLVM Clang, the benchmarks were carried out three times with varying CFLAGS/CXXFLAGS. 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. 9 [expr. My naive benchmark shows clang's executable run time is about 10% of the MSVC's runtime. 3 Code compiling on gcc, but not on msvc. For those that haven't looked at GCC vs. C/C++ compile times data viewer and text highlight for Clang and MSVC. A template parameter pack that is a parameter-declaration whose type contains one or more unexpanded Updated build compiler to VS 2022 17. I'd assume this is some quirk in MSVC's non-conformant name lookup behavior. 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. However, MSVC has a template parsing model that delays nearly every lookup to instantiation time, which is part of phase 2. Just grab the “Clang compiler for Windows,” an optional component of the “Desktop development with C++” workload. 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. Context I am developing a cross-platform project that depends on a highly performance sensitive open-source library. Know the Context. However there are still situations, where I would like to handle something specifically for gcc, and not for clang. I'm currently implementing my own CRT using Visual Studio 2022 and clang-cl (12. 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. 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). Comparing MSVC vs Clang . MSVC (actually the compiler is just called CL. 04 on WSL 2 to be precise) and depends on the number of images used for the process (more on that later). 8 (now required). GCC performance was quite close, as we've come to see over the years on various AArch64 single board computers and server platforms. My MSVC 2022 sets it by default with O2 optimization. This fix was backported to VS 2022 17. Hot The first question is whether you are actually using libc++ (clang) or libstdc++ ( gcc, but clang defaults to it on linux). The A bit late to the party, but there doesn't seem to be an accepted answer, so here is another option. 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. To use the Clang compiler the clang-cl compiler is called during compilation instead of the cl compiler. Clang Power Tools for In short: Clang is correct (though in one case, for the wrong reason). 3. Visual Studio has had great tooling for MSVC and GCC for quite a while now. 0 Git as of 23 December were all tested in their release form on Ubuntu 23. capture]/3 (C++17 draft N4659). But now it means "do this only for gcc and clang". 5 23 I'm wondering about std::variant performance. GCC is for people who don't mind spending 4 hours at the computer making it work properly. Clang also comes with a lot of handy code analysis tools like clang-format and clangd. You can specify the SDK-version by modifying the "VS2015 x64 Native Tools Command Prompt" to force the 8. 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). Clang is designed to be highly optimized, and can often compile code faster and use less memory than the MSVC toolset. 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. As part of the various end-of-year articles, this article is providing a fresh look at the GCC vs. 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). Here is a tutorial. Download. 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. GCC uses a lot of heuristics. 3. But for some workloads there were significant differences between the compilers: This is a problem with MSVC. For more information about some ways in which this I’ve a question about using Clang with MSVC. 3 23 P2291R3 constexpr Integral <charconv> VS 2022 17. Commented Feb 3, 2022 at 0:59. If MSVC works, it hella works! If MSVC doesn't work, it HELLA DON'T WORK. Visual Studio 2019 version 16. As part of our ongoing benchmarks of GCC 11 vs. I'm using VS 2010 and see the compiler generating a "jne" when using a normal if. 10. MSVC is wrong in the first case. Clang x86_64 performance is competing with these new 2024 versions. I need to write some addon for NodeJS. 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. 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. This is basically equivalent to a virtual function call, but Description. For the vast majority of benchmarks the LLVM Clang vs. This effectively breaks all intellisense regarding C++23 features. So you may use clang in your VS. If GCC installs, it works, and if it doesn't work, it's the IDE's problem. 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. Each has a unique design philosophy and architecture that caters to different needs and preferences. 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. MSVC's detailed info (implemented in VS 2022 17. Follow edited Mar 24, 2022 at 8:57. Compile Score. But I want to use expression block language extensions as well, which is perfectly supported by clang-cl. The difference is how they use it. – Peter Cordes. -G "Visual Studio 16 2019" -T ClangCL -A x64 or > mkdir build && cd build > cmake . Commented Feb 21, 2022 at 9:56. MSVC using vpmulld 32x32=>32-bit multiplies that run as 2 uops on Intel. VC++'s problem is the fact that the parameter type isn't qualified by typename. 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. lambda. MAR1 MAR1. This is good for performance (in a typical case), but awful if you want to do some source-level optimization (e. 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). a successful timing attack against the Kyber reference code compiled with some of the "optimization" options for Clang 15 (released in 2022) or newer. Posted on April 1, 2020 March 24, 2020 by David. 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. For today's AOCC 4. 4. MSVC allows many invalid constructs in class templates that Clang has historically rejected. 0 Git as of 23 December, and GCC 14. Clang: namely "When constant-time source yields variable-time binary: Exploiting curve25519-donna built with MSVC 2015". To create a C project in VS with clang- Here is that more extensive round of AOCC 4. 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). prim. exe) is the "official" compiler for Windows made by Microsoft themselves. 08. Clang with Microsoft CodeGen is using Clang to parse the source into an AST. @SujayPhadke - reified: to make real; a fully realized implementation; to take something abstract and make it concrete. Linux uses CLANG. Full IntelliSense is supported along with Visual Studio’s comprehensive debugging support. This has highlighted to me that clang is capable of Not at all, it's just a micro-optimization library that Agner Fog provides. I am performing feature matching process using OpenCV - 4. I am using C++17. 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. 29 calls the templated constructor. I am developing a cross-platform project that depends on a highly performance sensitive open-source library. 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. – In my view, the difference is that MSVC is (or at least has been historically) a Microsoft product. For example, following code: compiled well with clang/gcc (unix or Performance difference was about ~15% which was very noticeable in that application. 4 23 P2321R2 std::zip partial in VS 2022 17. You may choose to stick with the regular Visual Studio. -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. 3 (in C++). 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. Knowing that GCC is one of the most used C++ compilers. Unfortunatelly, clang-cl. BZKN BZKN. [temp. clang and g++ are correct. 1. Stack Overflow. VS 2022 17. -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. 2, LLVM Clang 17. 2. It works, but might not have good performance because the compiler has to be conservative about the state switches if using 256-bit registers. 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 . Now, when you can use MSVC with clang as the compiler, that might be reason to stop using GCC. 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. exe preprocessor, and I found no way to switch it to clang native preprocessor or cl. 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. Updated Clang to 18. VisualStudio extension used to display and highlight compilation profiling data. 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. 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. The latest preview brings Clang into the fold. 5x in performance between the best (Intel compiler) and worst compiler (LLVM clang compiler) on our Structure Function kernel (highly-tuned code for SKL). 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. 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. Check out our Clang/LLVM post for much more information. I will try to build on Windows using CLANG and give you update >clang-cl -v clang version 12. 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. Clang performance of the generated binaries on x86_64. g. The documentation hints that it is possible: Clang-Tidy configuration By default, Clang-Tidy does not set any checks when enabled. GCC is between the two and is typically about 25% of MSVC. 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. However, some compiler-dependent features such as Edit and Continue aren't available for Clang configurations. 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. But yeah, you don't really have to worry about it unless you'll make a really CPU-intensive program that uses all cores. Third, MSVC accepts some C++ code that Clang will typically diagnose as invalid. 3) is a local lambda expression; any other lambda-expression shall not have a capture-default or simple-capture in its lambda-introducer. Mimimum Reproducible Example. It's probably worth at least supporting MSVC as well, since it is excellent at warning about accidental type conversions. So, after check, I made a conclusion that problem is MSVC. 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). Overview Q & A Rating & Review. From [expr. fct]), then the template-parameter is a template parameter pack. Used Clang builtins to improve the performance of <cmath>'s floating-point comparison functions for mixed types. On Linux your main options are GCC and Clang. StackOverflow post Clang vs GCC - which produces faster binaries? Benchmarking LLVM & Clang Against GCC. GCC 13. 0 as the new Znver4 release of the AMD Optimizing C/C++ Compiler and derived from LLVM Clang 14 upstream. Skip to main content. For ARM the situation is ambiguous, often Clang optimizes better. Paste this into a blank C++ solution project template, such as the C++ console app. 2022 at 9:08. 1 23 P2273R3 constexpr unique_ptr VS 2022 17. 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 . Works fine with the /permissive-flag for standard conformance, but doesn't work without it. But then MSVC's code generator kicks in, so anything related to LLVM is not used. static. Executing performance gap between GCC and Clang. 03: Clang vs. 8. So this may just be a really slow build of clang that was shipped. 125 1 1 silver badge 5 5 bronze badges. ) I'm looking for the same info for clang. 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. The _HAS_CXX23 macro is not initially defined when using LLVM/clang-cl in Visual Studio 2022. C and C++ [Discuss] clang vs msvc vs mingw: Save: Authenticator Code. For your further understanding, please check this: 2024. And as @Cheersandhth says, it's good to use two compilers. GCC is wrong in the second case. For comparison, my M2 Max 8/4 takes 780s to compile. 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. I know both of the two ways use the same compiler: clang 3. However, I don't know what the difference is between them. however, I could not find a way to make it use an existing . The performance boost is very minimal, if there even is one in normal cases. 27 Use Clang with MSVC 2010. 39 to 19. 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. #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. I added this fra Skip to main content. cast]/p4, all quotes are from N3936):. – user18260579. exe /Zc:preprocessor compatible mode. 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). On the Apple M1 the performance was close and GCC in good standing. 2. I am trying to generate Visual Studio 2022 project files using CMake and the clang compiler. I am trying to get decent performance out of MSVC for this code. Share. you can make VS invoke clang-tidy with a list of checks. 2, LLVM Clang 18. exe. 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++. 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. 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. This may affect projects that have version assumptions. exe immitates old cl. the title of the -reddit- post, its pretty clear that the blog isn't talking about a general statement. This article explores the fundamental design differences between GCC and Clang, highlighting how these differences impact their functionality, performance, and usability. A lambda-expression whose smallest enclosing scope is a block scope (6. 12 Preview 2. 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. clang-tidy configuration file. 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. Or even easier you can use out of the box support on VS2019: On Windows, it’s easy to install the Clang tools. 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. #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". 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. Distinguish between Clang CL and MSVC CL. 2 call the copy constructor of Foo while MSVC v19. LLVM Clang 12 given these fresh open-source compiler releases, today's comparison is looking at the Core i9 11900K "Rocket Lake" performance. Have you tested performance of your clz64? I wouldn't be surprised that all this branching makes it slower than the OP's implementation. 0 23, Q P2251R1 Require span And basic_string_view To Be Trivially Copyable VS 2022 17. 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:. Of course, there are 128-bit AVX but here is a problem when toolchain is msvc. Please note that using Clang-cl instead of the default compiler can result in some incompatibility (especially for large codes). 0 benchmarking against the open-source LLVM/Clang and AOCC compilers. 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). Let's take a closer look at the code snippet in question: — I stumbled over the following piece of code. sln file: > mkdir build && cd build > cmake . 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. And graphics stack in linux is getting better year at year. Performance is one aspect, but I'd highly recommend supporting multiple compilers for their warnings/safety features. mru pqhi pia htxn iovzubd cknq fru ufonkk onvw olqh