[llvm] [InstComb] Try to convert inttoptr (add (ptrtoint %B), %O) to GEP. (PR #153421)

[Florian Hahn via llvm-commits]

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@@ -2073,6 +2073,22 @@ Instruction *InstCombinerImpl::visitIntToPtr(IntToPtrInst &CI) {
     return new IntToPtrInst(P, CI.getType());
   }
 
+  // Replace (inttoptr (add (ptrtoint %Base), %Offset)) with
+  //(getelementptr i8, %Base, %Offset) if all users are ICmps.
+  Value *Base;
+  Value *Offset;
+  if (match(CI.getOperand(0),
+            m_Add(m_PtrToInt(m_Value(Base)), m_Value(Offset))) &&
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fhahn wrote:

Updated to use `m_PtrToIntSameSize` and removed the size check below, thanks!

https://github.com/llvm/llvm-project/pull/153421