[clang] [llvm] [NVPTX] Add conversion intrinsics from/to fp8 types (e4m3, e5m2) (PR #102969)

[Sergey Kozub via cfe-commits]

sergey-kozub wrote:

Thanks for pushing this, I'll continue by adding the support to XLA to use these instructions.

https://github.com/llvm/llvm-project/pull/102969