[SYCL] Release notes for December SYCL implementation update

sycl/ReleaseNotes.md

@@ -1,3 +1,104 @@
+# December'19 release notes
+
+Release notes for commit 78d80a1cc628af76f09c53673ada906a3d2f0131
+
+## New features
+  - New attributes for Intel FPGA devices : `num_simd_work_items`, `bank_bits`,
+  `max_work_group_size`, `max_global_work_dim`
+  [61d60b6] [7becb9d] [9053642] [6441851]
+  - The infrastructure for device standard C/C++ libraries has been introduced.
+    `assert` can now be used in device code [0039ee0]
+  - Add opencl-aot tool for AoT compilation for Intel CPU devices [400460b]
+  - Added support for `cl::sycl::intel::experimental::printf` builtin [78d80a1]
+  - Implemented device code split feature: compiler can now be instructed to
+    split a single device code module into multiple via the
+    `-fsycl-device-code-split` option.
+    [9d7dba6] [cc93bc4] [5491486] [a339d4c] [9095749]
+
+## Improvements
+### SYCL Frontend and driver changes
+  - Allowed applying `cl::reqd_work_group_size` and
+    `cl::intel_reqd_sub_group_size` attributes to a lambda function [b06fc66]
+  - Allowed applying SYCL_EXTERNAL to functions with raw pointer arguments or
+    return value if `-Wno-error=sycl-strict` option is passed [2840458]
+  - Added support for FPGA device libraries in fat static libraries [d39ab73]
+  - Removed limitation of virtual types in SYCL [98754ff]
+
+### SYCL headers and runtime
+  - Added support for platform name and platform version in the device allowed
+    list [7f2f668]
+  - Made kernels and programs caches thread-safe [118dc82]
+  - It's now possible to omit `cl` namespace specifier when using SYCL API.
+    `sycl::buffer` can be used instead `cl::sycl::buffer` [67e4655]
+  - Diagnostic on attempt to do several actions in one command group has been
+    implemented [9f8ae50]
+  - `queue::submit` now throws synchronous exceptions [6a83d14]
+  - Enqueue pending tasks after host accessor destructor [80d17b2]
+  - Implemented more "flat" kernel submission `cl::sycl::queue` methods
+    [c5318c5]
+
+### Documentation
+  - Added support for generation of SYCL documentation with Doxygen [de418d6]
+  - [Design document](doc/extensions/C-CXX-StandardLibrary/C-CXX-StandardLibrary.rst)
+    which describes design of C/C++ standard library support has been added
+
+## Bug fixes
+### SYCL Frontend and driver changes
+  - Fixed problem which prevented attaching multiple attributes to a SYCL kernel
+    [b77e5b7]
+
+### SYCL headers and runtime
+  - Fixed a possible deadlock with host accessor' creation from multiple threads
+    [d1c6dbe]
+  - Compatibility issues that can happen when the SYCL library and SYCL
+    application are compiled with different version of standard headers are
+    fixed.  [d854643]
+  - Fixed compile error for `handler::copy` with `-fsycl-unnamed-lambda`
+    [e73d2ce]
+  - Fixed error which happened when autogenerated (`-fsycl-unnamed-lambda`)
+    kernel name contained `cl::sycl::half` type [514fc0b]
+  - Fixed crash on submitting a kernel with zero local size on the host device
+    [b6806ea]
+  - Made `vec::load` and `vec::store` member functions templated to align with
+    the SYCL specification [4bd76de]
+  - Made exceptions that are thrown in the copy back routine during SYCL
+    memory object destructor asynchronous [2d6dcd0]
+  - Fixed creation of host accessor to sub-buffer leading to crash in some
+    scenarios [f607520]
+  - Fixed build error on Windows caused by RuntimeLibrary value inconsistency
+    for LLVM and apps/tests linked with it [f9296b6]
+
+## Known issues
+- [new] The size of object file is increased compared to the older compiler
+  releases due to the recent fat object layout changes in the open source LLVM.
+- Using `cl::sycl::program` API to refer to a kernel defined in another
+  translation unit leads to undefined behaviour
+- Linkage errors with the following message:
+  `error LNK2005: "bool const std::_Is_integral<bool>" (??$_Is_integral@_N@std@@3_NB) already defined`
+  can happen when a SYCL application is built using MS Visual Studio 2019
+  version below 16.3.0
+  For MSVC version having the error the workaround is to use -std=c++17 switch.
+
+## Prerequisites
+### Linux
+- Experimental Intel(R) CPU Runtime for OpenCL(TM) Applications with SYCL
+  support version
+  [2020.9.1.0.18_rel](https://github.com/intel/llvm/releases/download/2019-12/oclcpuexp-2020.9.1.0.18_rel.tar.gz)
+  is recommended OpenCL CPU RT prerequisite for the SYCL compiler
+- The Intel(R) Graphics Compute Runtime for OpenCL(TM) version
+  [19.48.14977](https://github.com/intel/compute-runtime/releases/tag/19.48.14977)
+  is recommended OpenCL GPU RT prerequisite for the SYCL compiler.
+### Windows
+- Experimental Intel(R) CPU Runtime for OpenCL(TM) Applications with SYCL
+  support version
+  [2020.9.1.0.18_rel](https://github.com/intel/llvm/releases/download/2019-12/win-oclcpuexp-2020.9.1.0.18_rel.zip)
+  is recommended OpenCL CPU RT prerequisite for the SYCL compiler
+- The Intel(R) Graphics Compute Runtime for OpenCL(TM) version
+  [26.20.100.7463](https://downloadcenter.intel.com/download/29195/Intel-Graphics-Windows-10-DCH-Drivers)
+  is recommended OpenCL GPU RT prerequisite for the SYCL compiler.
+
+Please, see the runtime installation guide [here](https://github.com/intel/llvm/blob/sycl/sycl/doc/GetStartedWithSYCLCompiler.md#install-low-level-runtime)
+
 # November'19 release notes
 
 Release notes for commit e0a62df4e20eaf4bdff5c7dd46cbde566fbaee90