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Hi Matthew,

I have been reading my way through OpenCL in Action and the OpenCL Programming Guide and thoroughly enjoying them both. Thank you for writing this book!

I have a question about a couple of your ten tips for high-performance kernels, specifically loop unrolling and re-use of private variables. Most compilers of any significant maturity look for optimizations like this and implement them automatically. I was surprised to read that OpenCL compilers don't. I'd expect that they will reach that level of maturity at some point. The book has been out for a while now, and I'm curious - are you still finding that you have to make optimizations like this by hand?