[llvm-dev] Clang 5.0 support for armv8 64 bit with neon and auto vectorization

[Eric Fiselier via llvm-dev]

Windows support for libc++ is very immature, and I would recommend
disabling it on Windows. Work started on the port
only about a month ago and there are still a bunch of bugs and
unimplemented features.

Unfortunately building on Windows requires Clang since MSVC doesn't provide
`#include_next`
which is needed by libc++.

> Is it supported to be built with Visual studio or MinGW make files?

I've only ever targeted Ninja on Windows but I assume CMake would
be able to target other generators as well. (Assuming Visual Studio build
files allow using Clang).

/Eric

On Fri, Feb 3, 2017 at 1:03 PM, Renato Golin <renato.golin at linaro.org>
wrote:

> Adding some people that know about libcxx and/or windows on arm.
>
> Cheers,
> Renato
>
> On 3 Feb 2017 18:15, "Haider Zeeshan (CC/ESM1) via llvm-dev" <
> llvm-dev at lists.llvm.org> wrote:
>
>> One more thing, setting up clang 5,0 on windows, I have issues compiling
>> libcxx project.
>>
>> Is it supported to be built with Visual studio or MinGW make files?
>>
>> Mit freundlichen Grüßen / Best regards
>>
>> Zeeshan Haider
>> CC/ESM1
>>
>> Tel. +49(711)811-47379
>>
>>
>>
>> -----Original Message-----
>> From: Tim Northover [mailto:t.p.northover at gmail.com]
>> Sent: Freitag, 3. Februar 2017 18:05
>> To: Haider Zeeshan (CC/ESM1) <Zeeshan.Haider at de.bosch.com>
>> Cc: llvm-dev at lists.llvm.org
>> Subject: Re: [llvm-dev] Clang 5.0 support for armv8 64 bit with neon and
>> auto vectorization
>>
>> Hi Haider,
>>
>> On 3 February 2017 at 07:13, Haider Zeeshan (CC/ESM1) <
>> Zeeshan.Haider at de.bosch.com> wrote:
>> > Being that said, can I be sure that for 64 bit arm architectures (e.g.
>> arm cortex A57) the  neon feature and auto-vectorization is supported as
>> default by clang 5.0?
>>
>> Yes, unless something has gone horribly wrong they will be. The obvious
>> quick test would be to compile something trivial like
>>
>> void foo(float *arr) {
>>   for (int i = 0; i < 128; ++i)
>>     arr[i] += 1;
>> }
>>
>> and look at the output.
>>
>> Tim.
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>
>
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