[all-commits] [llvm/llvm-project] 89c1bf: [ARM] __ARM_ARCH macro definition fix (#81493)

[James Westwood via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 89c1bf1230e011f2f0e43554c278205fa1819de5
      https://github.com/llvm/llvm-project/commit/89c1bf1230e011f2f0e43554c278205fa1819de5
  Author: James Westwood <james.westwood at arm.com>
  Date:   2024-02-13 (Tue, 13 Feb 2024)

  Changed paths:
    M clang/docs/ReleaseNotes.rst
    M clang/lib/Basic/Targets/AArch64.cpp
    M clang/lib/Basic/Targets/ARM.cpp
    M clang/lib/Basic/Targets/ARM.h
    M clang/test/Preprocessor/arm-target-features.c
    M llvm/include/llvm/TargetParser/ARMTargetParser.h
    M llvm/lib/TargetParser/ARMTargetParser.cpp
    M llvm/unittests/TargetParser/TargetParserTest.cpp

  Log Message:
  -----------
  [ARM] __ARM_ARCH macro definition fix (#81493)

This patch changes how the macro __ARM_ARCH is defined to match its
defintion in the ACLE. In ACLE 5.4.1, __ARM_ARCH is defined as equal to
the major architecture version for ISAs up to and including v8. From
v8.1 onwards, its definition is changed to include minor versions, such
that for an architecture vX.Y, __ARM_ARCH = X*100 + Y. Before this
patch, LLVM defined __ARM_ARCH using only the major architecture version
for all architecture versions. This patch adds functionality to define
__ARM_ARCH correctly for architectures greater than or equal to v8.1.