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
>
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