[llvm] [WIP][VectorCombine] Fold "shuffle (binop (shuffle, shuffle)), undef" --> "binop (shuffle), (shuffle)" (PR #114101)

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git-clang-format --diff 4e1b9d34f922d3b8b04a65f29681cd95dc9ce75f c2a211f345b1d9f2b68c88d0d175ca22e5190f50 --extensions cpp -- llvm/lib/Transforms/Vectorize/VectorCombine.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/VectorCombine.cpp b/llvm/lib/Transforms/Vectorize/VectorCombine.cpp
index 77f757751f..ca917aeab5 100644
--- a/llvm/lib/Transforms/Vectorize/VectorCombine.cpp
+++ b/llvm/lib/Transforms/Vectorize/VectorCombine.cpp
@@ -1401,7 +1401,8 @@ bool VectorCombine::scalarizeLoadExtract(Instruction &I) {
   return true;
 }
 
-/// Try to convert "shuffle (binop (shuffle, shuffle)), undef" into "binop (shuffle), (shuffle)".
+/// Try to convert "shuffle (binop (shuffle, shuffle)), undef" into "binop
+/// (shuffle), (shuffle)".
 bool VectorCombine::foldPermuteOfBinops(Instruction &I) {
   BinaryOperator *BinOp;
   ArrayRef<int> OuterMask;
@@ -1461,10 +1462,10 @@ bool VectorCombine::foldPermuteOfBinops(Instruction &I) {
                          cast<Instruction>(BinOp->getOperand(1)));
 
   InstructionCost NewCost =
-      TTI.getShuffleCost(TargetTransformInfo::SK_PermuteTwoSrc, Op0Ty,
-                         NewMask0, CostKind, 0, nullptr, {Op00, Op01}) +
-      TTI.getShuffleCost(TargetTransformInfo::SK_PermuteTwoSrc, Op1Ty,
-                         NewMask1, CostKind, 0, nullptr, {Op10, Op11}) +
+      TTI.getShuffleCost(TargetTransformInfo::SK_PermuteTwoSrc, Op0Ty, NewMask0,
+                         CostKind, 0, nullptr, {Op00, Op01}) +
+      TTI.getShuffleCost(TargetTransformInfo::SK_PermuteTwoSrc, Op1Ty, NewMask1,
+                         CostKind, 0, nullptr, {Op10, Op11}) +
       TTI.getArithmeticInstrCost(Opcode, ShuffleDstTy, CostKind);
 
   LLVM_DEBUG(dbgs() << "Found a shuffle feeding a shuffled binop: " << I

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https://github.com/llvm/llvm-project/pull/114101