topic I'm no expert on the Apple in OpenCL* for CPU

IGIL vs GEN

Israel_M_ — Wed, 14 Dec 2016 22:15:36 GMT

Hi,

I see that on OS X, Apple CL compiler has an IGIL target. Is IGIL code the same as GEN code?

Is there a way to inspect IGIL/GEN programs resulting from building a CL kernel on OS X? This has been possible possible on Windows and Linux for a while now.

Thank you in advance.

I'm no expert on the Apple

Jeffrey_M_Intel1 — Fri, 16 Dec 2016 02:26:29 GMT

I'm no expert on the Apple OpenCL tools, but after researching here I can say that IGIL is not the same as Gen assembler. It is most likely an intermediate output from the LLVM CLANG frontend.

In theory it may be possible to use Gen assembly kernels to Windows or Linux to run, or to use with our tools. However, this isn't validated and a more portable format like SPIR/SPIR-V may be a better choice. Is your goal to bring over a CL kernel built in OS X to Linux or Windows?

Dear Jeffrey,

Israel_M_ — Fri, 16 Dec 2016 12:05:39 GMT

Dear Jeffrey,

Jeffrey M. (Intel) wrote:

Is your goal to bring over a CL kernel built in OS X to Linux or Windows?

Fortunately, I have the .cl sources, so portability is not a problem.

I wanted to get better understanding of how my CL code maps to hardware, and I thought getting to read corresponding assembly would be helpful. I will see if I can get Apple CLVM IGILPlugin to produce IGIL source; otherwise, I will use Linux CL SDK to produce GEN source, and hope it is not too much different from what I am getting on OS X.

Thanks for the clarification.

Jeffrey_M_Intel1 — Sat, 17 Dec 2016 01:01:45 GMT

Thanks for the clarification. Please let us know if you find scenarios where our compiler output could be better.