[llvm] [VPlan] Optimize FindLast of (binop %IV, live-in) by sinking. (PR #183911)

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``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp b/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
index c5b5c096f..1b55c0246 100644
--- a/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
+++ b/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
@@ -5680,7 +5680,7 @@ getExpressionIV(VPValue *V, VPRegionBlock *VectorLoopRegion) {
     std::swap(Op0, Op1);
 
   if (!Op1->isDefinedOutsideLoopRegions())
-      return nullptr;
+    return nullptr;
 
   return dyn_cast<VPWidenIntOrFpInductionRecipe>(Op0);
 }
@@ -5694,7 +5694,7 @@ static VPValue *sinkBinOpToMiddleBlock(VPValue *V, VPValue *ScalarIV,
   if (BinOp->getOperand(0) == WidenIV)
     BinOp->setOperand(0, ScalarIV);
   else {
-    assert(BinOp->getOperand(1) ==  WidenIV && "one operand must be WideIV");
+    assert(BinOp->getOperand(1) == WidenIV && "one operand must be WideIV");
     BinOp->setOperand(1, ScalarIV);
   }
   BinOp->insertBefore(*InsertPt->getParent(), InsertPt);
@@ -5751,9 +5751,9 @@ void VPlanTransforms::optimizeFindIVReductions(VPlan &Plan,
     assert(is_contained(CondSelect->getDefiningRecipe()->operands(), PhiR));
     VPValue *ExprOfIV = TrueVal == PhiR ? FalseVal : TrueVal;
 
-    // Check if IV is a simple expression of a widened IV. If so, we can track the underlying IV and sink the expression.
-    auto *ExpressionIV =
-        getExpressionIV(ExprOfIV, VectorLoopRegion);
+    // Check if IV is a simple expression of a widened IV. If so, we can track
+    // the underlying IV and sink the expression.
+    auto *ExpressionIV = getExpressionIV(ExprOfIV, VectorLoopRegion);
     const SCEV *IVSCEV = vputils::getSCEVExprForVPValue(
         ExpressionIV ? ExpressionIV : ExprOfIV, PSE, &L);
     const SCEV *Step;

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https://github.com/llvm/llvm-project/pull/183911