================
@@ -66,6 +66,16 @@ struct CIRGenTypeCache {
unsigned char PointerSizeInBytes;
};
+ /// The size and alignment of size_t.
+ union {
+ unsigned char SizeSizeInBytes; // sizeof(size_t)
----------------
andykaylor wrote:
It will eventually be used by the array cookie implementation.
The fact that these are unions is a detail inherited from classic codegen that
dates back to a [massive
change](https://github.com/llvm/llvm-project/commit/7f416cc426384ad1f891addb61d93e7ca1ffa0f2#diff-34b07c79fb949b0d227d01937bf32a06c0bbfa2ca904b4ecf85a787d0edf62d7)
@rjmccall made in 2015 to fix many alignment handling problems. I'll admit
that my treatment of the alignment details is based on not trusting my own
understanding of what should be happening enough to change any of it, so I've
reproduced a few things like this without fully understanding why they are the
way they are. If I had to speculate I'd say that as of the time of
implementation 'size' and 'align' were always equal but we wanted to keep the
implementation flexible enough to report them separately if an ABI came along
that required them not to be equal?
https://github.com/llvm/llvm-project/pull/145802
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