CODEWITHSUNDEEP
opencl
rjs
rjs

Reputation: 437

OpenCL kernel compiler optimisations

I'm using OpenCL on OS X, I was wondering if someone could tell me the compiler which is used to generate the GPU binary from the OpenCL kernel source code? In OS X is the OpenCL kernel compiled to LLVM first then optimized and then finally compiled to GPU native code? Also I was wondering if the OpenCL kernel compiler does optimisations on the kernel such as loop invariant code motion?

Upvotes: 1

Views: 396

Answers (1)

Eric Bainville
Eric Bainville

Reputation: 9886

Yes, on Mac OS X all OpenCL code is compiled to LLVM IR, which is then passed to device-specific optimizations and code generation.

You can generate LLVM bitcode files offline, and use the result in clCreateProgramWithBinary. The openclc compiler is inside the OpenCL framework (/System/Library/Framework/OpenCL.framework/Libraries/openclc). You need these options (arch can be i386, x86_64, gpu_32):

openclc -c -o foo.bc -arch gpu_32 -emit-llvm foo.cl

Upvotes: 3

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