[llvm] [EarlyCSE] Compare GEP instructions based on offset (PR #65875)

[Nikita Popov via llvm-commits]

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@@ -336,6 +336,13 @@ static unsigned getHashValueImpl(SimpleValue Val) {
   if (CallInst *CI = dyn_cast<CallInst>(Inst))
     return hashCallInst(CI);
 
+  if (auto *GEP = dyn_cast<GetElementPtrInst>(Inst)) {
+    auto &DL = GEP->getModule()->getDataLayout();
+    APInt Offset(DL.getIndexTypeSizeInBits(GEP->getType()), 0);
+    if (GEP->accumulateConstantOffset(DL, Offset))
+      return hash_combine(GEP->getOpcode(), GEP->getOperand(0), Offset);
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nikic wrote:

nit: getPointerOperand().

https://github.com/llvm/llvm-project/pull/65875