[llvm] [SDISel][Combine] Constant fold FP16_TO_FP (PR #94790)

[Matt Arsenault via llvm-commits]

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@@ -26586,7 +26586,12 @@ SDValue DAGCombiner::visitFP16_TO_FP(SDNode *N) {
     }
   }
 
-  return SDValue();
+  // Sometimes constants manage to survive very late in the pipeline, e.g.,
+  // because they are wrapped inside the <1 x f16> type. Try one last time to
+  // get rid of them.
+  SDValue Folded = DAG.FoldConstantArithmetic(
+      N->getOpcode(), SDLoc(N), N->getValueType(0), ArrayRef<SDValue>(&N0, 1));
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arsenm wrote:

{N0}?

https://github.com/llvm/llvm-project/pull/94790