[llvm] [AArch64][SVE] Add lowering for PARTIAL_REDUCE_U/SMLA to USDOT (PR #131327)

[Benjamin Maxwell via llvm-commits]

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@@ -29506,6 +29513,80 @@ SDValue AArch64TargetLowering::LowerVECTOR_HISTOGRAM(SDValue Op,
   return Scatter;
 }
 
+// Lower PARTIAL_REDUCE_*MLA(Acc, MUL(ZEXT(MulOpLHS), SEXT(MulOpRHS)), Splat 1)
+// to USDOT(Acc, MulOpLHS, MulOpRHS)
+// Lower PARTIAL_REDUCE_*MLA(Acc, MUL(SEXT(MulOpLHS), ZEXT(MulOpRHS)), Splat 1)
+// to USDOT(Acc, MulOpRHS, MulOpLHS)
+SDValue
+AArch64TargetLowering::LowerPARTIAL_REDUCE_MLA(SDValue Op,
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MacDue wrote:

So this is called for the types marked "Custom" in #130935?

https://github.com/llvm/llvm-project/pull/131327