[llvm] [InstCombine] Simplifiy `(-x * y * -x)` into `(x * y * x)` (PR #72953)

[Nikita Popov via llvm-commits]

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@@ -351,6 +351,12 @@ Instruction *InstCombinerImpl::visitMul(BinaryOperator &I) {
   // X * -Y --> -(X * Y)
   if (match(&I, m_c_Mul(m_OneUse(m_Neg(m_Value(X))), m_Value(Y))))
     return BinaryOperator::CreateNeg(Builder.CreateMul(X, Y));
+  // (-X * Y) * -X --> (X * Y) * X
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nikic wrote:

Add an empty line above here.

https://github.com/llvm/llvm-project/pull/72953