[llvm] [NVPTX] Add atom.add.noftz support, avoid CAS loops when noftz is available (PR #223569)

[Akshay Deodhar via llvm-commits]

================
@@ -3299,7 +3301,13 @@ defm INT_PTX_ATOM_ADD_32 : F_ATOMIC_2<I32RT, atomic_load_add_i32, "add", "u32",
 defm INT_PTX_ATOM_ADD_64 : F_ATOMIC_2<I64RT, atomic_load_add_i64, "add", "u64", atomic_load_add>;
 
 defm INT_PTX_ATOM_ADD_F16  : F_ATOMIC_2<F16RT, atomic_load_fadd, "add.noftz", "f16", atomic_load_fadd, [SM70, PTX63]>;
-defm INT_PTX_ATOM_ADD_BF16 : F_ATOMIC_2<BF16RT, atomic_load_fadd, "add.noftz", "bf16", atomic_load_fadd, [SM90]>;
+defm INT_PTX_ATOM_ADD_BF16 : F_ATOMIC_2<BF16RT, atomic_load_fadd, "add.noftz", "bf16", atomic_load_fadd, [SM90, PTX78]>;
----------------
akshayrdeodhar wrote:

Thanks, its redundant

https://github.com/llvm/llvm-project/pull/223569