[all-commits] [llvm/llvm-project] 8998fa: [clang] Change AMX macros to match names from GCC

[Joe Loser via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8998fa6c14f1e19957858aa0e4b592d62ae56041
      https://github.com/llvm/llvm-project/commit/8998fa6c14f1e19957858aa0e4b592d62ae56041
  Author: Joe Loser <joeloser at fastmail.com>
  Date:   2023-02-03 (Fri, 03 Feb 2023)

  Changed paths:
    M clang/lib/Basic/Targets/X86.cpp
    M clang/lib/Headers/immintrin.h
    M clang/test/Preprocessor/predefined-arch-macros.c
    M clang/test/Preprocessor/x86_amx_target_features.c
    M clang/test/Preprocessor/x86_target_features.c

  Log Message:
  -----------
  [clang] Change AMX macros to match names from GCC

The current behavior for AMX macros is:

```
gcc -march=native -dM -E - < /dev/null | grep TILE

clang -march=native -dM -E - < /dev/null | grep TILE
```

which is not ideal.  Change `__AMXTILE__` and friends to `__AMX_TILE__` (i.e.
have an underscore in them).  This makes GCC and Clang agree on the naming of
these AMX macros to simplify downstream user code.

Fix this for `__AMXTILE__`, `__AMX_INT8__`, `__AMX_BF16__`, and `__AMX_FP16__`.

Differential Revision: https://reviews.llvm.org/D143094