[SYCL] Release notes for February'20 SYCL implementation update (#1400)

Signed-off-by: Vlad Romanov <vlad.romanov@intel.com>

Author: romanovvlad

sycl/ReleaseNotes.md

@@ -1,3 +1,140 @@
+# February'20 release notes
+
+Release notes for commit e8f1f29
+
+## New features
+  - Added `__builtin_intel_fpga_mem` for the FPGA SYCL device. The built-in is
+    used to indicate the characteristics of the load-store unit (LSU) to be used
+    when de-referencing the pointer [1e33c01]
+  - Added support for the `intelfpga::no_global_work_offset` attribute
+    [8bed533] [5a9058b]
+  - Added basic xmethod implementation for `sycl::accessor::operator[]` to make
+    it callable from gdb command line [d6be8ff]
+  - Added device libraries for standard math like `std::cos` and `std::complex`
+    type [7abd9d5]
+
+## Improvements
+### SYCL Frontend and driver changes
+  - Added support for passing a non-type template parameter to the `loop_unroll`
+    attribute [8d7a32a]
+  - Relaxed the standard layout requirement for kernel arguments. Now by default
+    they should be trivially copyable. The `-sycl-std=1.2.1` driver option turns
+    standard layout requirement "on" [3adb4a5]
+  - Added diagnostic on using `__float128` type in the device code [659efdf]
+  - The `intelfpga::max_private_copies` has been renamed to
+    `intelfpga::private_copies` [97a199f]
+  - Prevented duplication of error diagnostics for `-fsycl` [3a0b62e]
+  - Added diagnostic when attempting to use existing FPGA static library with
+    additional device code [6431be6]
+  - Added support for non-type template parameters for FPGA memory attributes
+    [ffcad03]
+
+### SYCL headers and runtime
+  - The `SYCL_DEVICE_WHITE_LIST` control was renamed to `SYCL_DEVICE_ALLOWLIST`
+    [4df18fa]
+  - Added a leaf limit to the execution graph to avoid leaf bloat in
+    applications that have an overwhelming number of command groups that can
+    be executed in parallel [7c293e2]
+  - Added `get_range()` method to the image and local accessors to align with
+    the SYCL specification [8ed5566]
+  - Added a diagnostic on attempt to create a context from devices that are
+    bound to different platforms [8f354f7]
+  - An ordered queue can now be created by passing
+   `sycl::property::queue::in_order` property to the `sycl::queue` constructor
+    [c855520]
+  - Added a diagnostic on attempt to create an accessor with an unsupported type
+    [306624e]
+  - Made host device return `nullptr` for bad USM allocation functions
+    (huge, 0, etc) [2a000d9]
+  - Added templated forms of USM allocation functions [42cf5bf]
+  - Added support for APIs that query properties of USM pointers [926e38e]
+  - Added cleanup of finished command nodes of the execution graph in the
+    situations when the `wait` for a command is called implicitly or explicitly
+    [438dc49]
+  - Added 2 `sycl::queue` constructors accepting `sycl::context` and
+    `sycl::device` arguments [c81c1c5]
+
+### Documentation
+  - Added [documentation](doc/extensions/QueueShortcuts/QueueShortcuts.adoc) for
+    simplification of the `sycl::queue` functions [478b7c0]
+  - Added [documentation](doc/extensions/ReqdWorkGroupSize/SYCL_INTEL_reqd_work_group_size.asciidoc)
+    for `reqd_work_group_size` extension [c2c416a]
+  - The FAQ [document](doc/FAQ.md) was introduced [e42b40e]
+  - Added Ordered Queue Property
+    [proposal](doc/extensions/OrderedQueue/OrderedQueue_v2.adoc) [9fa878f]
+  - Added device code split options documentation to the
+    [user's manual](doc/UsersManual.md) [1355aa6]
+  - Added documentation for [ExtendedAtomics extension](doc/extensions/ExtendedAtomics/SYCL_INTEL_extended_atomics.asciidoc) [4445462]
+  - Removed old Ordered Queue proposal and make a note of deprecation [e8f1f29]
+
+## Bug fixes
+### SYCL Frontend and driver changes
+  - Fixed variable sharing passed by value to `parallel_for_work_group`
+    [d8ea63a]
+  - Do not produce an error if some restricted feature (e.g. exceptions) is used
+    by a function only referenced in unevaluated contexts [5eae571]
+  - Fixed problem with not cleaning up temporary files when device code split
+    feature is enabled [d86ee2f]
+  - Fixed issue with emitting wrong 'typename' keywords in the integration
+    header [c19372e]
+  - The SYCL target image registration functions have been renamed to avoid
+    conflicts with the OpenMP registration functions [82fd970]
+  - Avoid using `std::memcpy` in the device code [f39f47e]
+  - Fixed `-save-temps` option when used along with `-fsycl` [f7f4699]
+  - Fixed link steps triggering for libraries specified through
+    `-foffload-static-lib` when no source or object file is provided [360b25b]
+  - Fixed output options behavior for `-fsycl-link` on Windows [67b24d46]
+
+### SYCL headers and runtime
+  - Fixed final result saturation in the host implementation of `sycl::mad_sat`
+    [54dddb4]
+  - Fixed a crash when a non-nullptr_t `0x0` value is passed to the
+    `sycl::buffer::set_final_data` method [6a0e279]
+  - Fixed an issue with copying sub-buffer between different contexts [0867a38]
+  - Resolved the problem when local accessor is a temporary object [1eed329]
+  - Fixed an issue with the event not being retained when a memory object is
+    constructed using interoperability constructors [0aabe7e]
+  - Fixed compilation of kernels which use `sycl::stream` for FPGA device
+    [c4dbaa2]
+  - Fixed execution graph cleanup on memory object destruction [7a75b54]
+
+## Known issues
+  - [new] Defining a `SUCCESS` or `FAILED` can break SYCL headers because such
+    names are used internally
+  - [new] The format of the object files produced by the compiler can change
+    between versions. The workaround is to rebuild the application.
+  - [new] The SYCL library doesn't guarantee stable API/ABI, so applications
+    compiled with older version of the SYCL library may not work with new one.
+    The workaround is to rebuild the application.
+  - 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
+    The workaround is to enable `-std=c++17` for the failing MSVC version.
+
+## Prerequisites
+### Linux
+- Experimental Intel(R) CPU Runtime for OpenCL(TM) Applications with SYCL
+  support version
+  [2020.10.3.0.04](https://github.com/intel/llvm/releases/download/2020-02/oclcpuexp-2020.10.3.0.04_rel.tar.gz)
+  is the recommended OpenCL CPU RT prerequisite for the SYCL compiler
+- The Intel(R) Graphics Compute Runtime for OpenCL(TM) version
+  [20.06.15619](https://github.com/intel/compute-runtime/releases/tag/20.06.15619)
+  is the recommended OpenCL GPU RT prerequisite for the SYCL compiler.
+<!--### Windows-->
+- Experimental Intel(R) CPU Runtime for OpenCL(TM) Applications with SYCL
+  support version
+  [2020.10.3.0.04](https://github.com/intel/llvm/releases/download/2020-02/win-oclcpuexp-2020.10.3.0.04_rel.zip)
+  is the recommended OpenCL CPU RT prerequisite for the SYCL compiler
+- The Intel(R) Graphics Compute Runtime for OpenCL(TM) version
+  [26.20.100.7870](https://downloadcenter.intel.com/download/29426/Intel-Graphics-Windows-10-DCH-Drivers)
+  is the 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/GetStartedGuide.md#install-low-level-runtime)
+
+
 # December'19 release notes
 
 Release notes for commit 78d80a1cc628af76f09c53673ada906a3d2f0131