[llvm] [AMDGPU] selecting v_sat_pk instruction, version 2 (PR #123297)

[Matt Arsenault via llvm-commits]

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@@ -6605,6 +6616,14 @@ void SITargetLowering::ReplaceNodeResults(SDNode *N,
     Results.push_back(lowerFSQRTF16(SDValue(N, 0), DAG));
     break;
   }
+  case ISD::TRUNCATE_SSAT_U: {
+    SDLoc SL(N);
+    SDValue Op =
+        DAG.getNode(AMDGPUISD::SAT_PK_CAST, SL, MVT::i16, N->getOperand(0));
+    Op = DAG.getNode(ISD::BITCAST, SL, MVT::v2i8, Op);
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arsenm wrote:

Don't hardcode the v2i8, use the type from N 

https://github.com/llvm/llvm-project/pull/123297