[llvm] [SelectionDAG] Use GetSplitVector in SplitVec(Res/Op)_PARTIAL_REDUCE_MLA (PR #162513)

[Craig Topper via llvm-commits]

https://github.com/topperc created https://github.com/llvm/llvm-project/pull/162513

Using DAG.getSplitVector creates new nodes that need to be legalized. We should use GetSplitVector to get the already legalized copy of the inputs.

>From deaf371e7f2a848b582bdee23ff4f0eaa5f05328 Mon Sep 17 00:00:00 2001
From: Craig Topper <craig.topper at sifive.com>
Date: Wed, 8 Oct 2025 09:45:19 -0700
Subject: [PATCH] [SelectionDAG] Use GetSplitVector in
 SplitVec(Res/Op)_PARTIAL_REDUCE_MLA

Using DAG.getSplitVector creates new nodes that need to be legalized.
We should use GetSplitVector to get the already legalized copy of
the inputs.
---
 llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp b/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
index 87d5453cd98cf..3b5f83f7c089a 100644
--- a/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
@@ -3416,7 +3416,7 @@ void DAGTypeLegalizer::SplitVecRes_PARTIAL_REDUCE_MLA(SDNode *N, SDValue &Lo,
   SDValue Input2 = N->getOperand(2);
 
   SDValue AccLo, AccHi;
-  std::tie(AccLo, AccHi) = DAG.SplitVector(Acc, DL);
+  GetSplitVector(Acc, AccLo, AccHi);
   unsigned Opcode = N->getOpcode();
 
   // If the input types don't need splitting, just accumulate into the
@@ -3429,8 +3429,8 @@ void DAGTypeLegalizer::SplitVecRes_PARTIAL_REDUCE_MLA(SDNode *N, SDValue &Lo,
 
   SDValue Input1Lo, Input1Hi;
   SDValue Input2Lo, Input2Hi;
-  std::tie(Input1Lo, Input1Hi) = DAG.SplitVector(Input1, DL);
-  std::tie(Input2Lo, Input2Hi) = DAG.SplitVector(Input2, DL);
+  GetSplitVector(Input1, Input1Lo, Input1Hi);
+  GetSplitVector(Input2, Input2Lo, Input2Hi);
   EVT ResultVT = AccLo.getValueType();
 
   Lo = DAG.getNode(Opcode, DL, ResultVT, AccLo, Input1Lo, Input2Lo);
@@ -4761,8 +4761,8 @@ SDValue DAGTypeLegalizer::SplitVecOp_PARTIAL_REDUCE_MLA(SDNode *N) {
 
   SDLoc DL(N);
   SDValue Input1Lo, Input1Hi, Input2Lo, Input2Hi;
-  std::tie(Input1Lo, Input1Hi) = DAG.SplitVector(N->getOperand(1), DL);
-  std::tie(Input2Lo, Input2Hi) = DAG.SplitVector(N->getOperand(2), DL);
+  GetSplitVector(N->getOperand(1), Input1Lo, Input1Hi);
+  GetSplitVector(N->getOperand(2), Input2Lo, Input2Hi);
   unsigned Opcode = N->getOpcode();
   EVT ResultVT = Acc.getValueType();