[llvm] [SelectionDAG][AArch64] Add dot product lowering in NEON for PARTIAL_REDUCE_*MLA ISD nodes (PR #140075)

[Sander de Smalen via llvm-commits]

================
@@ -1872,6 +1872,15 @@ AArch64TargetLowering::AArch64TargetLowering(const TargetMachine &TM,
     setPartialReduceMLAAction(MVT::nxv2i64, MVT::nxv16i8, Custom);
   }
 
+  if (EnablePartialReduceNodes && Subtarget->hasNEON() &&
+      Subtarget->hasDotProd()) {
+    setPartialReduceMLAAction(MVT::v2i64, MVT::v8i16, Legal);
+    setPartialReduceMLAAction(MVT::v4i32, MVT::v16i8, Legal);
+    setPartialReduceMLAAction(MVT::v4i32, MVT::v16i8, Legal);
----------------
sdesmalen-arm wrote:

This one is a duplicate.

https://github.com/llvm/llvm-project/pull/140075