pocl 1.0

Highlights

• Improved automatic local work-group sizing on kernel enqueue, taking
  into account standard constraints, SIMD width for vectorization as
  well as the number of compute units available on the device.
• Support for NVIDIA GPUs via a new CUDA backend (currently experimental).
• Removed support for BBVectorizer.
• LLVM 5.0 is now supported.
• A few build options have been added for distribution builds,
  see README.packaging.
• Somewhat improved scalability in the CPU driver. CPUs with many cores
  and programs using a lot of WIs with small kernels can run somewhat faster.
• Full conformance with OpenCL 1.2 standard, enabled by default. There are
  some caveats though - see the documentation.
• When conformance is enabled, some kernel library functions might be
  slower than in previous releases.
• Pocl now reports OpenCL 1.2 instead of 2.0, except HSA enabled builds.
• Updated format of pocl binaries, which is NOT backwards compatible.
  You'll need to clean any kernel caches.
• Fixed several memory leaks.
• Unresolved symbols (missing/misspelled functions etc) in a kernel will
  result in error in clBuildProgram() instead of pocl silently ignoring
  them and then aborting at dlopen().
• New env variable POCL_MEMORY_LIMIT=N limits the Global memory size
  reported by pocl to N gigabytes.
• New env variable POCL_AFFINITY (defaults to 0): if enabled, sets
  the affinity of each CPU driver pthread to a single core.
• Improved AVX512 support (with LLVM 5.0). Note that even with LLVM 5.0
  there are still a few bugs (see pocl issue #555); AVX512 + LLVM 4.0 are
  a lot more broken, and probably not worth trying.
• POCL_DEBUG env var has been revamped. You can now limit debuginfo to
  these categories (or their combination): all,error,warning,general
  memory,llvm,events,cache,locking,refcounts,timing,hsa,tce,cuda
  The old setting POCL_DEBUG=1 now equals error+warning+general.