[OPENMP] update release note for implemented OMP 5.0 features

[kkwli0]

Summary

In addition to r350757, the release note is updated for more OMP 5.0 features.

[ABataev]

It would be good to update OpenMPSupport.rst too to show supported features from OpenMP 5.0.

[kkwli0]

Add update in OpenMP support release note.

[ABataev]

LG

[gtbercea]

Could we add the changes in D56790 to this diff?

[kkwli0]

In D56733#1360221, @gtbercea wrote:

Could we add the changes in D56790 to this diff?

Sure, I will do that.

[kkwli0]

Add changes in D56790.

[gtbercea]

In D56733#1362182, @kkwli0 wrote:

In D56733#1360221, @gtbercea wrote:

Could we add the changes in D56790 to this diff?

Sure, I will do that.

Thanks a lot!

[gtbercea]

docs/OpenMPSupport.rst

62 ↗

(On Diff #182384)

Simplified SPMD code generation for distribute parallel for when the new default schedules are applicable.

[kkwli0]

docs/OpenMPSupport.rst

62 ↗

(On Diff #182384)

Will update the sentence.

[kkwli0]

Addressed reviewer's comment.

[gtbercea]

Thanks for the update!

LG

cfe/trunk/docs/OpenMPSupport.rst

 
 .. contents::
    :local:
 
 ==================
 OpenMP Support
 ==================
 
-Clang fully supports OpenMP 4.5. Clang supports offloading to X86_64, AArch64,
-PPC64[LE] and has `basic support for Cuda devices`_.
-
-Standalone directives
-=====================
-
-* #pragma omp [for] simd: :good:`Complete`.
-
-* #pragma omp declare simd: :partial:`Partial`.  We support parsing/semantic
-  analysis + generation of special attributes for X86 target, but still
-  missing the LLVM pass for vectorization.
-
-* #pragma omp taskloop [simd]: :good:`Complete`.
-
-* #pragma omp target [enter|exit] data: :good:`Complete`.
-
-* #pragma omp target update: :good:`Complete`.
-
-* #pragma omp target: :good:`Complete`.
-
-* #pragma omp declare target: :good:`Complete`.
+Clang supports the following OpenMP 5.0 features
 
-* #pragma omp teams: :good:`Complete`.
+* The `reduction`-based clauses in the `task` and `target`-based directives.
 
-* #pragma omp distribute [simd]: :good:`Complete`.
+* Support relational-op != (not-equal) as one of the canonical forms of random
+  access iterator.
 
-* #pragma omp distribute parallel for [simd]: :good:`Complete`.
+* Support for mapping of the lambdas in target regions.
 
-Combined directives
-===================
+* Parsing/sema analysis for the requires directive.
 
-* #pragma omp parallel for simd: :good:`Complete`.
+* Nested declare target directives.
 
-* #pragma omp target parallel: :good:`Complete`.
+* Make the `this` pointer implicitly mapped as `map(this[:1])`.
 
-* #pragma omp target parallel for [simd]: :good:`Complete`.
+* The `close` *map-type-modifier*.
 
-* #pragma omp target simd: :good:`Complete`.
-
-* #pragma omp target teams: :good:`Complete`.
-
-* #pragma omp teams distribute [simd]: :good:`Complete`.
-
-* #pragma omp target teams distribute [simd]: :good:`Complete`.
-
-* #pragma omp teams distribute parallel for [simd]: :good:`Complete`.
-
-* #pragma omp target teams distribute parallel for [simd]: :good:`Complete`.
+Clang fully supports OpenMP 4.5. Clang supports offloading to X86_64, AArch64,
+PPC64[LE] and has `basic support for Cuda devices`_.
 
-Clang does not support any constructs/updates from OpenMP 5.0 except
-for `reduction`-based clauses in the `task` and `target`-based directives.
+* #pragma omp declare simd: :partial:`Partial`.  We support parsing/semantic
+  analysis + generation of special attributes for X86 target, but still
+  missing the LLVM pass for vectorization.
 
 In addition, the LLVM OpenMP runtime `libomp` supports the OpenMP Tools
-Interface (OMPT) on x86, x86_64, AArch64, and PPC64 on Linux, Windows, and mac OS.
+Interface (OMPT) on x86, x86_64, AArch64, and PPC64 on Linux, Windows, and macOS.
 
+General improvements
+--------------------
+- New collapse clause scheme to avoid expensive remainder operations.
+  Compute loop index variables after collapsing a loop nest via the
+  collapse clause by replacing the expensive remainder operation with
+  multiplications and additions.
+
+- The default schedules for the `distribute` and `for` constructs in a
+  parallel region and in SPMD mode have changed to ensure coalesced
+  accesses. For the `distribute` construct, a static schedule is used
+  with a chunk size equal to the number of threads per team (default
+  value of threads or as specified by the `thread_limit` clause if
+  present). For the `for` construct, the schedule is static with chunk
+  size of one.
+  
+- Simplified SPMD code generation for `distribute parallel for` when
+  the new default schedules are applicable.
+
 .. _basic support for Cuda devices:
 
 Cuda devices support
 ====================
 
 Directives execution modes
 --------------------------
 

cfe/trunk/docs/ReleaseNotes.rst

 ABI Changes in Clang
 --------------------
 
 - ...
 
 OpenMP Support in Clang
 ----------------------------------
 
-- ...
+- OpenMP 5.0 features
+
+  - Support relational-op != (not-equal) as one of the canonical forms of random
+    access iterator.
+  - Added support for mapping of the lambdas in target regions.
+  - Added parsing/sema analysis for the requires directive.
+  - Support nested declare target directives.
+  - Make the `this` pointer implicitly mapped as `map(this[:1])`.
+  - Added the `close` *map-type-modifier*.
+
+- Various bugfixes and improvements.
+
+New features supported for Cuda devices:
+
+- Added support for the reductions across the teams.
+
+- Extended number of constructs that can be executed in SPMD mode.
+
+- Fixed support for lastprivate/reduction variables in SPMD constructs.
+
+- New collapse clause scheme to avoid expensive remainder operations.
+
+- New default schedule for distribute and parallel constructs.
+
+- Simplified code generation for distribute and parallel in SPMD mode.
+
+- Flag (``-fopenmp_optimistic_collapse``) for user to limit collapsed
+  loop counter width when safe to do so.
+
+- General performance improvement.
 
 CUDA Support in Clang
 ---------------------
 
 
 Internal API Changes
 --------------------