| Issue |
182951
|
| Summary |
[clang] _GCC_DESTRUCTIVE_SIZE potentially incorrect on Apple arm64
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
ldionne
|
On Apple arm64, `sysctl -a | grep cacheline` reports `hw.cachelinesize: 128`. However,
```
$ echo | clang++ -target apple-macos-arm64 -dM -E - | grep -E "__GCC.*SIZE"
#define __GCC_CONSTRUCTIVE_SIZE 64
#define __GCC_DESTRUCTIVE_SIZE 64
```
That is a bit surprising, since I would expect at least `__GCC_DESTRUCTIVE_SIZE` to be 128. Did I misunderstand something, is there a goal to be compatible with GCC, or is that really a bug?
@philnik777 or @huixie90 I think this came up in some of our prior discussions
CC @AaronBallman as the author of https://github.com/llvm/llvm-project/pull/89446, which added that macro to Clang.
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