I can confirm that MSYS2's x86_64 clang++ compiler does not support __popcnt but does support __builtin_popcount. I looked into it a little bit, and found out that the clang commit that adds the __popcnt builtins is very recent (September 2016). I seems like it has not made it into a release yet.
Here is the commit: https://github.com/llvm-mirror/clang/commit/5eb95c4c284486351e3ed0fdad011acf41540c8b The source code archive that Alexey used to build the MSYS2 clang++ does not have the changes from that commit in it: http://repo.msys2.org/mingw/sources/mingw-w64-clang-3.9.1-3.src.tar.gz I don't intend to submit any more patches for this issue. Jacek has already committed my patch to mingw-w64 (thanks!). Once the new version of clang comes out and people start using it there should not be any problems. If any clang users are itching to use __popcnt before the new version of clang comes out, they can easily remove the #if I put in intrin-impl.h. They could also use __has_builtin in intrin-impl.h to detect whether clang has the builtin or not. Mateusz, the "CodeGen" folder in clang is not just used for MSVC libs, it has tons of general-purpose code for generating LLVM code from C/C++ code. --David Grayson On Wed, Feb 8, 2017 at 1:24 PM, Mateusz <mati...@gmail.com> wrote: > Opps, gmail put output into quote. Improved version: > $ clang++ popcnt.cc -std=c++14 -fms-extensions > popcnt.cc:9:26: error: use of undeclared identifier '__popcnt16' > unsigned short usr = __popcnt16(us[i]); > ^ > popcnt.cc:17:24: error: use of undeclared identifier '__popcnt' > unsigned int uir = __popcnt(ui[i]); > ^ > popcnt.cc:26:28: error: use of undeclared identifier '__popcnt64'; did you > mean '_popcnt64'? > unsigned __int64 ulr = __popcnt64(ul[i]); > ^~~~~~~~~~ > _popcnt64 > D:\msys64\mingw64\bin\..\lib\clang\3.9.1\include\popcntintrin.h:90:1: note: > '_popcnt64' declared here > _popcnt64(long long __A) > ^ > 3 errors generated. > > > > 2017-02-08 22:22 GMT+01:00 Mateusz <mati...@gmail.com>: > >> I think ms-extensions was made default option for mingw and msvc clang and >> codegen is used only for creating msvc libs. Here is Clang output anyway: >> >> $ clang++ popcnt.cc -std=c++14 -fms-extensions >> popcnt.cc:9:26: error: use of undeclared identifier '__popcnt16' >> unsigned short usr = __popcnt16(us[i]); >> ^ >> popcnt.cc:17:24: error: use of undeclared identifier '__popcnt' >> unsigned int uir = __popcnt(ui[i]); >> ^ >> popcnt.cc:26:28: error: use of undeclared identifier '__popcnt64'; did you >> mean '_popcnt64'? >> unsigned __int64 ulr = __popcnt64(ul[i]); >> ^~~~~~~~~~ >> _popcnt64 >> D:\msys64\mingw64\bin\..\lib\clang\3.9.1\include\popcntintrin.h:90:1: >> note: '_popcnt64' declared here >> _popcnt64(long long __A) >> ^ >> 3 errors generated. >> >> 2017-02-08 20:10 GMT+01:00 David Grayson <davidegray...@gmail.com>: >> >>> Mateusz, thanks for looking in to this. >>> >>> Here are the relevant lines from the clang source code that indicate >>> that it supports those builtins: >>> >>> https://github.com/llvm-mirror/clang/blob/3e45634a7f951c2306 >>> e4b368f9fb8c8d80c48273/include/clang/Basic/Builtins.def#L760-L762 >>> https://github.com/llvm-mirror/clang/blob/4cedfcc1ecf8387082 >>> 183508604b7f47c634f708/lib/CodeGen/CGBuiltin.cpp#L804-L821 >>> >>> Can you try your clang test again with the "-fms-extensions" argument? >>> >>> (I tried to test clang myself earlier but I had various issues. I >>> could probably try again tonight if you don't want to.) >>> >>> --David >>> >>> On Wed, Feb 8, 2017 at 10:54 AM, Mateusz <mati...@gmail.com> wrote: >>> > MSYS2 native Clang test-popcnt.cpp: >>> > >>> > $ clang++ popcnt.cc -std=c++14 >>> > popcnt.cc:9:26: error: use of undeclared identifier '__popcnt16' >>> > unsigned short usr = __popcnt16(us[i]); >>> > ^ >>> > popcnt.cc:17:24: error: use of undeclared identifier '__popcnt' >>> > unsigned int uir = __popcnt(ui[i]); >>> > ^ >>> > popcnt.cc:26:28: error: use of undeclared identifier '__popcnt64'; did >>> you >>> > mean '_popcnt64'? >>> > unsigned __int64 ulr = __popcnt64(ul[i]); >>> > ^~~~~~~~~~ >>> > _popcnt64 >>> > D:\msys64\mingw64\bin\..\lib\clang\3.9.1\include\popcntintrin.h:90:1: >>> note: >>> > '_popcnt64' declared here >>> > _popcnt64(long long __A) >>> > ^ >>> > 3 errors generated. >>> > >>> > Probably its safe to enable it for Clang, I'll try tomorrow late. >>> > >>> > 2017-02-08 18:37 GMT+01:00 David Grayson <davidegray...@gmail.com>: >>> > >>> >> Hello. This patch adds support for the Microsoft __popcnt16, __popcnt, >>> >> and __popcnt64 intrinsics, which are documented here: >>> >> >>> >> https://msdn.microsoft.com/en-us/library/bb385231.aspx >>> >> >>> >> I was trying to compile ANGLE recently and one of the first errors I >>> >> encountered was due to both GCC/mingw-w64 not supporting __popcnt. >>> >> >>> >> I attached the simple C++ program I used to test this patch. >>> >> >>> >> I am not totally sure, but it looks like Clang already supports the >>> >> __popcnt intrinsics because I saw code for it in the clang >>> repository. So >>> >> that is why this patch has "#if !defined(__clang__)" around it. >>> >> >>> >> I read the documentation for intrin.h and intrin-impl.h and I believe >>> this >>> >> patch follows all the rules. It would be great if it could be merged >>> in. >>> >> Thanks! >>> >> >>> >> --David Grayson >>> >> >>> >> ------------------------------------------------------------ >>> >> ------------------ >>> >> Check out the vibrant tech community on one of the world's most >>> >> engaging tech sites, SlashDot.org! http://sdm.link/slashdot >>> >> _______________________________________________ >>> >> Mingw-w64-public mailing list >>> >> Mingw-w64-public@lists.sourceforge.net >>> >> https://lists.sourceforge.net/lists/listinfo/mingw-w64-public >>> >> >>> >> >>> > ------------------------------------------------------------ >>> ------------------ >>> > Check out the vibrant tech community on one of the world's most >>> > engaging tech sites, SlashDot.org! http://sdm.link/slashdot >>> > _______________________________________________ >>> > Mingw-w64-public mailing list >>> > Mingw-w64-public@lists.sourceforge.net >>> > https://lists.sourceforge.net/lists/listinfo/mingw-w64-public >>> >>> ------------------------------------------------------------ >>> ------------------ >>> Check out the vibrant tech community on one of the world's most >>> engaging tech sites, SlashDot.org! http://sdm.link/slashdot >>> _______________________________________________ >>> Mingw-w64-public mailing list >>> Mingw-w64-public@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/mingw-w64-public >>> >> >> > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, SlashDot.org! http://sdm.link/slashdot > _______________________________________________ > Mingw-w64-public mailing list > Mingw-w64-public@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/mingw-w64-public ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Mingw-w64-public mailing list Mingw-w64-public@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mingw-w64-public
