[llvm] Reland "[NVPTX] Add support for atomic add for f16 type" (PR #85197)

[Adrian Kuegel via llvm-commits]

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@@ -1520,11 +1520,13 @@ multiclass F_ATOMIC_2_imp<ValueType ptrT, NVPTXRegClass ptrclass,
   def imm : NVPTXInst<(outs regclass:$dst), (ins ptrclass:$addr, IMMType:$b),
     !strconcat("atom", SpaceStr, OpcStr, TypeStr, " \t$dst, [$addr], $b;", ""),
     [(set (regT regclass:$dst), (IntOp (ptrT ptrclass:$addr), IMM:$b))]>,
-  Requires<Pred>;
+  Requires<!listconcat(Pred, [!if(!eq(TypeStr, ".f16"), Predicate<"false">, Predicate<"true">)])>;
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akuegel wrote:

This is a bit ugly, maybe you have an idea how to improve this? At least it seems to do what it should :)

https://github.com/llvm/llvm-project/pull/85197