[llvm] AMDGPU: Custom lower fptrunc vectors for f32 -> f16 (PR #141883)

[Matt Arsenault via llvm-commits]

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@@ -6900,14 +6902,44 @@ SDValue SITargetLowering::getFPExtOrFPRound(SelectionDAG &DAG, SDValue Op,
                            DAG.getTargetConstant(0, DL, MVT::i32));
 }
 
+SDValue SITargetLowering::SplitFP_ROUNDVectorToPacks(SDValue Op,
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arsenm wrote:

This would be shorter if it followed splitUnaryVectorOp, except this one needs to carry forward the rounding flag operand 

https://github.com/llvm/llvm-project/pull/141883