[llvm] [AggressiveInstCombine] Fold i64 x i64 -> i128 multiply-by-parts (PR #156879)

[Igor Kirillov via llvm-commits]

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@@ -1428,6 +1428,259 @@ static bool foldLibCalls(Instruction &I, TargetTransformInfo &TTI,
   return false;
 }
 
+/// Match low part of 128-bit multiplication.
+static bool foldMul128Low(Instruction &I, const DataLayout &DL,
+                          DominatorTree &DT) {
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igogo-x86 wrote:

DL/DT are unused here and below

https://github.com/llvm/llvm-project/pull/156879