[X86] `detectAVGPattern()`: small preparatory NFC refactor

diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index d1579d4..be5edb7 100644 (file)
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -46784,23 +46784,22 @@ static SDValue detectAVGPattern(SDValue In, EVT VT, SelectionDAG &DAG,
     return DAG.getNode(X86ISD::AVG, DL, Ops[0].getValueType(), Ops);
   };
 
-  auto AVGSplitter = [&](SDValue Op0, SDValue Op1) {
+  auto AVGSplitter = [&](std::array<SDValue, 2> Ops) {
     // Pad to a power-of-2 vector, split+apply and extract the original vector.
     unsigned NumElemsPow2 = PowerOf2Ceil(NumElems);
     EVT Pow2VT = EVT::getVectorVT(*DAG.getContext(), ScalarVT, NumElemsPow2);
     if (NumElemsPow2 != NumElems) {
-      SmallVector<SDValue, 32> Ops0(NumElemsPow2, DAG.getUNDEF(ScalarVT));
-      SmallVector<SDValue, 32> Ops1(NumElemsPow2, DAG.getUNDEF(ScalarVT));
-      for (unsigned i = 0; i != NumElems; ++i) {
-        SDValue Idx = DAG.getIntPtrConstant(i, DL);
-        Ops0[i] = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, ScalarVT, Op0, Idx);
-        Ops1[i] = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, ScalarVT, Op1, Idx);
+      for (SDValue &Op : Ops) {
+        SmallVector<SDValue, 32> EltsOfOp(NumElemsPow2, DAG.getUNDEF(ScalarVT));
+        for (unsigned i = 0; i != NumElems; ++i) {
+          SDValue Idx = DAG.getIntPtrConstant(i, DL);
+          EltsOfOp[i] =
+              DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, ScalarVT, Op, Idx);
+        }
+        Op = DAG.getBuildVector(Pow2VT, DL, EltsOfOp);
       }
-      Op0 = DAG.getBuildVector(Pow2VT, DL, Ops0);
-      Op1 = DAG.getBuildVector(Pow2VT, DL, Ops1);
     }
-    SDValue Res =
-        SplitOpsAndApply(DAG, Subtarget, DL, Pow2VT, {Op0, Op1}, AVGBuilder);
+    SDValue Res = SplitOpsAndApply(DAG, Subtarget, DL, Pow2VT, Ops, AVGBuilder);
     if (NumElemsPow2 == NumElems)
       return Res;
     return DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, VT, Res,
@@ -46817,7 +46816,7 @@ static SDValue detectAVGPattern(SDValue In, EVT VT, SelectionDAG &DAG,
     SDValue VecOnes = DAG.getConstant(1, DL, InVT);
     Operands[1] = DAG.getNode(ISD::SUB, DL, InVT, Operands[1], VecOnes);
     Operands[1] = DAG.getNode(ISD::TRUNCATE, DL, VT, Operands[1]);
-    return AVGSplitter(Operands[0].getOperand(0), Operands[1]);
+    return AVGSplitter({Operands[0].getOperand(0), Operands[1]});
   }
 
   // Matches 'add like' patterns: add(Op0,Op1) + zext(or(Op0,Op1)).
@@ -46864,7 +46863,7 @@ static SDValue detectAVGPattern(SDValue In, EVT VT, SelectionDAG &DAG,
       }
 
     // The pattern is detected, emit X86ISD::AVG instruction(s).
-    return AVGSplitter(Operands[0], Operands[1]);
+    return AVGSplitter({Operands[0], Operands[1]});
   }
 
   return SDValue();