[LLVMdev] [RFC] OpenMP offload infrastructure

["C. Bergström"]

On 08/11/14 01:03 PM, Das, Dibyendu wrote:
> I didn’t see SPIR discussed anywhere.
This isn't OpenCL and depending on OpenCL for OpenMP may not really make 
sense. While I have my own opinions - If you feel strongly that it will 
help enable higher performance somewhere please list those reasons.
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More specifically
LLVM has a native AMD dGPU backend that is tightly coupled to the 
compiler. Unlike other platforms which use things like PTX or other 
byte-codes. Those platforms lose performance or have to work-around not 
having hw level details. Assuming this is done correctly it would be a 
disservice to emit SPIR instead of native codegen. (Imagine JAVA JIT vs 
C performance)

This also keeps everything in the open..

In my experience - people don't use OpenMP because they want so-so 
performance.. and with Exascale this will be increasingly important..