compiling binaries for MIC native and offload modes with gcc-4.9

[Mark Farnell]

The AVX512 is now supported in gcc-4.9

gcc.gnu.org/gcc-4.9/changes.html

So this is why I am intereted in using gcc 4.9 to compile applications
for Phi, and I don't have access to an Intel compiler

So could you please show me the gcc flags for producing MIC native binary?

Also, could you please show me the gcc flags for an offload binary
(i.e. running on host CPU, but offload the portion marked for offload
to MIC)?  Is this offload mode supported in GCC?

On Thu, May 8, 2014 at 1:23 AM, Stephan Walter
<stephan.walter@ziti.uni-heidelberg.de> wrote:
> Am 03.05.2014 07:43, schrieb Mark Farnell:
>
>> Suppose if I write a C++ application that contains hints to offload
>> part of the code to the Intel Xeon phi (MIC), then what compile do I
>> pass to allow generation of code that offload the code to MIC?  Also,
>> if I want to have a native MIC binary which the whole application runs
>> inside the MIC card, what compile flag should I use instead?
>>
>> Finally, does gcc-4.9 support the same set of MIC-related keywords as
>> the Intel Cluster Studio compiler, including the offloading keyword,
>> and keywords that mark variables as shared between the CPU and MIC?
>
>
> I use the Intel XeonPhi Softwarepackage and the included GCC version and so
> on.
>
> With this it is possible to compile more or less everything. If not, you
> have to use the Intel Compiler, but the only Problem i have is, that i am
> not able to compile code that use the new 512Bit instructions.
>
> If you use GCC, you have to do a crosscopile. If don't know how to do this,
> say it please, perhaps i can help you.
>
> If you are able to use the Intelcompiler, you just have to use the -mmic
> flag.
>
> I think a look on this documents will help you also:
> https://software.intel.com/en-us/articles/building-a-native-application-for-intel-xeon-phi-coprocessors
> https://www.tacc.utexas.edu/documents/13601/900205/Cluster_2013_MIC_Native.pdf/671d6403-b974-4027-b3a6-c4a61a433f5c
>
> As far i know gcc not jet support the intrinsics, but don't nail me down on
> this
>
>