[PATCH] D136919: [X86][RFC] Change mangle name of __bf16 from u6__bf16 to DF16b

[John McCall via Phabricator via cfe-commits]

rjmccall added a comment.

Okay.  That raises the question of what the default semantics should be for `std::bfloat16_t`, i.e. whether we should semantically default the type to using excess-precision `float` arithmetic.  If we did, we'd still be able to demote solitary `float` operations to BF16, but anything more complex than that would often force promotion without user intervention.

Of course, even if we do default the type to excess precision, we could still have a flag to disable that, and we could potentially have different default values on different targets.


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  https://reviews.llvm.org/D136919/new/

https://reviews.llvm.org/D136919