[PATCH] D98012: [RFC][doc] Document that RISC-V's __fp16 has different behavior

[Sjoerd Meijer via Phabricator via cfe-commits]

SjoerdMeijer added a comment.

> However we would like have slight different behavior for __fp16 other

than ACLE: The evaluation format of __fp16 set same as _Float16,
which means no promotion are performed if there is no hardware half-precision
supported.

Well, this is really problematic, because you're giving `__fp16` semantics, you're defining it to behave as `_Float16`.
Redefining an existing type, let it differentiate from other targets can never be a good thing.
I don't see how this is going to help anyone.


Repository:
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https://reviews.llvm.org/D98012