[llvm] [ValueTracking] Suport GEPs in matchSimpleRecurrence. (PR #123518)

[via llvm-commits]

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@@ -9240,6 +9262,21 @@ bool llvm::matchSimpleRecurrence(const PHINode *P, BinaryOperator *&BO,
 
       break; // Match!
     }
+    case Instruction::GetElementPtr: {
+      if (LU->getNumOperands() != 2 ||
+          !cast<GetElementPtrInst>(L)->getSourceElementType()->isIntegerTy(8))
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goldsteinn wrote:

Could you just match `LU` with `m_PtrAdd`?

https://github.com/llvm/llvm-project/pull/123518