[llvm] [InferAddressSpaces] Infer pointer stored and then loaded from global variable (PR #159755)

[Wenju He via llvm-commits]

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@@ -304,10 +304,24 @@ static bool isNoopPtrIntCastPair(const Operator *I2P, const DataLayout &DL,
          (P2IOp0AS == I2PAS || TTI->isNoopAddrSpaceCast(P2IOp0AS, I2PAS));
 }
 
+// Returns true if every user of a given GV are "simple" loads or stores in the
+// same function, with the store actually writing to GV.
+static bool isLocallyAccessedBySimpleLoadsStores(const GlobalVariable *GV,
+                                                 const Function *F) {
+  return all_of(GV->users(), [=](const User *U) {
+    if (const auto *SI = dyn_cast<StoreInst>(U))
+      return SI->getPointerOperand() == GV && SI->getFunction() == F;
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wenju-he wrote:

> Can you add negative tests for the data use and the wrong function

done

https://github.com/llvm/llvm-project/pull/159755