Compilation with CLang under Windows about sleef HOT 12 CLOSED

Hi,

Any progress on that?
There is clang-cl.exe which should compatible to MSVC.
Also it allows using flags of CLang using -XClang -clangFlag (In case of multiple flags it will be -XClang -clangFlag001 -XClang -clangFlag002) if some flags needed for better performance.

from sleef.

This is not a problem in SLEEF.

from sleef.

@shibatch ,
It is a problem of SLEEF.

You have CLang Compiler in Windows which is fully compatible to CLang in Linux and have full AVX2 support.
You just need to let it be used just like MSVC in CMAKE and also in the Macors in the code.

from sleef.

Clang that comes with visual studio is indicated as experimental.
I don't know under what condition other versions of clang works correctly.
You can use AVX if it works, since it is not disabled. It is just not supported.

from sleef.

I'm not talking on CLang under MSVC (In that case it is only a parser).

I'm talking about CLang for Windows which is fully compatible to CLang on any other system.

All you need to make sure that if the Compiler is CLang under Windows it is treated just like CLang under Linux.

from sleef.

By the way, LLVM 6.x.x ships with Clang for Windows which is MSVC compatible.
Namely you can get the Clang performance just by switching the compiler identifier.

This will give modern OpenMP and high quality compiler in Windows (With proper AVX / AVX2 / AVX512 support).
It should be easy to utilize it.

from sleef.

Those clang versions are not properly supported by cmake.

from sleef.

They are perfectly supported with CMake.
The main developer of CMake use them on daily basis.

It works with the Ninja Generator which might even speed up the whole process.

from sleef.

Could you build sleef with clang on windows and provide the command line for compilation?

from sleef.

The problem is your code is very sensitive to the generator and the compiler.
You added many cases to take care of them and created something which is hard to make portable.

Moreover you make wrong assumptions about the code of LLVM / CLang (Which has no issue with generating AVX code on Windows unlike GCC).

If you make sure you treat Clang just like GCC it will work.

from sleef.

Please write a patch yourself.
I'm not interested.

from sleef.

@shibatch ,
I got you, you don't want Windows users.

I just think that you should fix errors in the page (AVX support has nothing to do with Cygwin, only with GCC, all other compilers support AVX on Windows).

from sleef.