[llvm] [RISCV] Add FPR16 regbank and start legalizing f16 operations for Zfh. (PR #96582)

[Craig Topper via llvm-commits]

topperc wrote:

> Oops, I already have an unsubmitted patch for half fp arith :) It was blocked by supporting half fp with only F or F + Zfhmin.

Why is that blocking?

> Do you plan to support other ops (fcmp/fconstant/fp<->fp/fp<->int)?

Yes.

https://github.com/llvm/llvm-project/pull/96582