[llvm] [SPIR-V] Improve type inference for a known instruction's builtin: OpGroupAsyncCopy (PR #96895)

[Michal Paszkowski via llvm-commits]

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@@ -2377,9 +2383,80 @@ static bool generateLoadStoreInst(const SPIRV::IncomingCall *Call,
   return true;
 }
 
-/// Lowers a builtin funtion call using the provided \p DemangledCall skeleton
-/// and external instruction \p Set.
 namespace SPIRV {
+// Try to find a builtin funtion attributes by a demangled function name and
+// return a tuple <builtin group, op code, ext instruction number>, or a special
+// tuple value <-1, 0, 0> if the builtin funtion is not found.
+// Not all builtin funtions are supported, only those with a ready-to-use op
+// code or instruction number defined in TableGen.
+// TODO: consider a major rework of mapping demangled calls into a builtin
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michalpaszkowski wrote:

Just a comment, not necessary to address right now, we might be able to implement this mapping function directly in the TableGen and expose as a lookup function. Though I am not totally sure.

https://github.com/llvm/llvm-project/pull/96895