[PATCH] D151313: [RISCV][BF16] Make backend type bf16 to follow the psABI

[Jun Sha via Phabricator via llvm-commits]

joshua-arch1 added a comment.

In D151313#4367945 <https://reviews.llvm.org/D151313#4367945>, @asb wrote:

> Sorry to not have specifics on this - I'm working on a patch in this same area and as you've found as well, it's quite fiddly. Using the `__truncsfhf2` and `__extendhfsf2` libcalls isn't correct - they expect 16-bit floats in a different format to bfloat16.

I have checked compiler-rt/lib/builtins. There is truncsfbf2 for single-bfloat conversion, but I cannot find any library for bfloat extend.


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