[LLVMIR] atomicrmw unspoort half data type

[Acthinks]

ref: https://llvm.org/docs/LangRef.html#atomicrmw-instruction

does it make sense to support half atomic?

cuda has half/half2 atomic API and has corresponding ptx
https://docs.nvidia.com/cuda/cuda-c-programming-guide/index.html#atomicadd

[arsenm]

These already support half and <2 x half>

[Acthinks]

https://godbolt.org/z/zhaY7h66K

Great, thank you.

[Acthinks]

unsupport <2 x half> @arsenm
https://godbolt.org/z/a5MaYxbhd

[arsenm]

unsupport <2 x half> @arsenm
https://godbolt.org/z/a5MaYxbhd

This is using an old llc, use current main or a new release

[Acthinks]

YYDS, Thanks @arsenm