This patch set implement _Float16 both for softfloat and hardfloat (zfh/zfhmin), _Float16 has introduced into RISC-V psABI[1] since Jul 2021 and zfh/zfhmin extension has ratified since 2022[2].
[1] https://github.com/riscv-non-isa/riscv-elf-psabi-doc/pull/172 [2] https://github.com/riscv/riscv-isa-manual/commit/b35a54079e0da11740ce5b1e6db999d1d5172768
