[llvm] [DAGCombiner] Narrow the integer source of uint_to_fp (PR #222899)

[Dmitry Sidorov via llvm-commits]

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@@ -20641,6 +20641,32 @@ SDValue DAGCombiner::visitUINT_TO_FP(SDNode *N) {
   if (SDValue FTrunc = foldFPToIntToFP(N, DL, DAG, TLI))
     return FTrunc;
 
+  // fold (uint_to_fp x) -> (uint_to_fp (trunc x)) when the value of x is known
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MrSidims wrote:

Routine from https://github.com/llvm/llvm-project/pull/224242 is almost the same as here. I suggest to introduce a single utility function use for both singed and unsigned conversion. Also, given that the routine is essentially the same - it would make sense to handle both conversions in a single PR.

https://github.com/llvm/llvm-project/pull/222899