[Flang][OpenMP] Add some semantic checks for Linear clause (#111354)

This PR adds all the missing semantics for the Linear clause based on
the OpenMP 5.2 restrictions. The restriction details are mentioned
below.

OpenMP 5.2:
5.4.6 linear Clause restrictions
- A linear-modifier may be specified as ref or uval only on a declare
simd directive.
- If linear-modifier is not ref, all list items must be of type integer.
- If linear-modifier is ref or uval, all list items must be dummy
arguments without the VALUE attribute.
- List items must not be Cray pointers or variables that have the
POINTER attribute. Cray pointer support has been deprecated.
- If linear-modifier is ref, list items must be polymorphic variables,
assumed-shape arrays, or variables with the ALLOCATABLE attribute.
- A common block name must not appear in a linear clause.
- The list-item cannot appear more than once

4.4.4 ordered Clause restriction
- If n is explicitly specified, a linear clause must not be specified on
the same directive.

5.11 aligned Clause restriction
- Each list item must have C_PTR or Cray pointer type or have the
POINTER or ALLOCATABLE attribute. Cray pointer support has been
deprecated.
4 files changed
tree: 97440d2944ebf77f82a73256d80ecb7780c9c2b2
  1. .ci/
  2. .github/
  3. bolt/
  4. clang/
  5. clang-tools-extra/
  6. cmake/
  7. compiler-rt/
  8. cross-project-tests/
  9. flang/
  10. libc/
  11. libclc/
  12. libcxx/
  13. libcxxabi/
  14. libunwind/
  15. lld/
  16. lldb/
  17. llvm/
  18. llvm-libgcc/
  19. mlir/
  20. offload/
  21. openmp/
  22. polly/
  23. pstl/
  24. runtimes/
  25. third-party/
  26. utils/
  27. .clang-format
  28. .clang-tidy
  29. .git-blame-ignore-revs
  30. .gitattributes
  31. .gitignore
  32. .mailmap
  33. CODE_OF_CONDUCT.md
  34. CONTRIBUTING.md
  35. LICENSE.TXT
  36. pyproject.toml
  37. README.md
  38. SECURITY.md
README.md

The LLVM Compiler Infrastructure

OpenSSF Scorecard OpenSSF Best Practices libc++

Welcome to the LLVM project!

This repository contains the source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and run-time environments.

The LLVM project has multiple components. The core of the project is itself called “LLVM”. This contains all of the tools, libraries, and header files needed to process intermediate representations and convert them into object files. Tools include an assembler, disassembler, bitcode analyzer, and bitcode optimizer.

C-like languages use the Clang frontend. This component compiles C, C++, Objective-C, and Objective-C++ code into LLVM bitcode -- and from there into object files, using LLVM.

Other components include: the libc++ C++ standard library, the LLD linker, and more.

Getting the Source Code and Building LLVM

Consult the Getting Started with LLVM page for information on building and running LLVM.

For information on how to contribute to the LLVM project, please take a look at the Contributing to LLVM guide.

Getting in touch

Join the LLVM Discourse forums, Discord chat, LLVM Office Hours or Regular sync-ups.

The LLVM project has adopted a code of conduct for participants to all modes of communication within the project.