diff --git a/mlir/compiler-course/dormidontov_egor_lab4/CMakeLists.txt b/mlir/compiler-course/dormidontov_egor_lab4/CMakeLists.txt
new file mode 100644
index 0000000000000..13de9eb0f4b84
--- /dev/null
+++ b/mlir/compiler-course/dormidontov_egor_lab4/CMakeLists.txt
@@ -0,0 +1,16 @@
+set(Title "MaxLoopRegionDepthPass")
+set(Student "Dormidontov_Egor")
+set(Group "FIIT2")
+set(TARGET_NAME "${Title}_${Student}_${Group}_MLIR")
+
+file(GLOB_RECURSE SOURCES *.cpp *.h *.hpp)
+
+add_llvm_pass_plugin(${TARGET_NAME}
+    ${SOURCES}
+    DEPENDS
+    intrinsics_gen
+    MLIRBuiltinLocationAttributesIncGen
+    BUILDTREE_ONLY
+)
+
+set(MLIR_TEST_DEPENDS ${TARGET_NAME} ${MLIR_TEST_DEPENDS} PARENT_SCOPE)
diff --git a/mlir/compiler-course/dormidontov_egor_lab4/lab4.cpp b/mlir/compiler-course/dormidontov_egor_lab4/lab4.cpp
new file mode 100644
index 0000000000000..d63586986bd13
--- /dev/null
+++ b/mlir/compiler-course/dormidontov_egor_lab4/lab4.cpp
@@ -0,0 +1,71 @@
+#include "mlir/Dialect/Affine/IR/AffineOps.h"
+#include "mlir/Dialect/Func/IR/FuncOps.h"
+#include "mlir/Dialect/SCF/IR/SCF.h"
+#include "mlir/IR/Builders.h"
+#include "mlir/IR/BuiltinOps.h"
+#include "mlir/Pass/Pass.h"
+#include "mlir/Tools/Plugins/PassPlugin.h"
+#include "llvm/Support/raw_ostream.h"
+
+using namespace mlir;
+
+namespace {
+int computeMaxLoopDepth(func::FuncOp funcOp) {
+  int maxDepth = 0;
+  std::function<void(Operation *, int)> visit = [&](Operation *op,
+                                                    int curDepth) {
+    if (isa<scf::ForOp, scf::WhileOp, scf::IfOp, affine::AffineForOp>(op))
+      ++curDepth;
+    if (curDepth > maxDepth)
+      maxDepth = curDepth;
+    for (Region &region : op->getRegions()) {
+      for (Block &block : region) {
+        for (Operation &nestedOp : block) {
+          visit(&nestedOp, curDepth);
+        }
+      }
+    }
+  };
+
+  visit(funcOp.getOperation(), 0);
+
+  return maxDepth;
+}
+
+class MaxLoopRegionDepthPass
+    : public PassWrapper<MaxLoopRegionDepthPass, OperationPass<ModuleOp>> {
+public:
+  StringRef getArgument() const final {
+    return "MaxLoopRegionDepthPass_Dormidontov_Egor_FIIT2_MLIR";
+  }
+  StringRef getDescription() const final {
+    return "Attach max region nest depth for each loop to function";
+  }
+
+  void runOnOperation() override {
+    ModuleOp moduleOp = getOperation();
+    OpBuilder builder(moduleOp);
+
+    moduleOp.walk([&](func::FuncOp funcOp) {
+      int maxDepth = computeMaxLoopDepth(funcOp);
+      funcOp->setAttr("max_loop_region_depth",
+                      builder.getI32IntegerAttr(maxDepth));
+      llvm::outs() << "Func " << funcOp.getName()
+                   << ": max_loop_region_depth = " << maxDepth << "\n";
+    });
+  }
+};
+} // namespace
+
+MLIR_DECLARE_EXPLICIT_TYPE_ID(MaxLoopRegionDepthPass)
+MLIR_DEFINE_EXPLICIT_TYPE_ID(MaxLoopRegionDepthPass)
+
+mlir::PassPluginLibraryInfo getMaxLoopRegionDepthPassPluginInfo() {
+  return {MLIR_PLUGIN_API_VERSION, "MaxLoopRegionDepthPass", "1.0",
+          []() { mlir::PassRegistration<MaxLoopRegionDepthPass>(); }};
+}
+
+extern "C" LLVM_ATTRIBUTE_WEAK mlir::PassPluginLibraryInfo
+mlirGetPassPluginInfo() {
+  return getMaxLoopRegionDepthPassPluginInfo();
+}
diff --git a/mlir/test/compiler-course/dormidontov_egor_lab4/test.mlir b/mlir/test/compiler-course/dormidontov_egor_lab4/test.mlir
new file mode 100644
index 0000000000000..5f2face47428d
--- /dev/null
+++ b/mlir/test/compiler-course/dormidontov_egor_lab4/test.mlir
@@ -0,0 +1,54 @@
+// RUN: mlir-opt -load-pass-plugin=%mlir_lib_dir/MaxLoopRegionDepthPass_Dormidontov_Egor_FIIT2_MLIR%shlibext \
+// RUN: --pass-pipeline="builtin.module(MaxLoopRegionDepthPass_Dormidontov_Egor_FIIT2_MLIR)" %s | FileCheck %s
+
+// ###Простая функция без циклов/if
+// CHECK-LABEL: func.func @no_loops
+// CHECK: attributes {max_loop_region_depth = 0 : i32}
+func.func @no_loops() -> () {
+  %c0 = arith.constant 0 : index
+  return
+}
+
+// ###Одна петля, глубина = 1
+// CHECK-LABEL: func.func @simple_loop
+// CHECK: attributes {max_loop_region_depth = 1 : i32}
+func.func @simple_loop() -> () {
+  %c0 = arith.constant 0 : index
+  %c1 = arith.constant 1 : index
+  %c10 = arith.constant 10 : index
+  scf.for %i = %c0 to %c10 step %c1 {
+    // level 1
+  }
+  return
+}
+
+// ###Вложенный цикл, глубина = 2
+// CHECK-LABEL: func.func @nested_loops
+// CHECK: attributes {max_loop_region_depth = 2 : i32}
+func.func @nested_loops() -> () {
+  %c0 = arith.constant 0 : index
+  %c1 = arith.constant 1 : index
+  %c10 = arith.constant 10 : index
+  scf.for %i = %c0 to %c10 step %c1 {
+    scf.for %j = %c0 to %c10 step %c1 {
+      // level 2
+    }
+  }
+  return
+}
+
+// ###Цикл с if внутри и if во вложении, глубина = 3
+// CHECK-LABEL: func.func @deep_nest
+// CHECK: attributes {max_loop_region_depth = 3 : i32}
+func.func @deep_nest(%arg0: i1) -> () {
+  %c0 = arith.constant 0 : index
+  %c1 = arith.constant 1 : index
+  %c10 = arith.constant 10 : index
+  scf.for %i = %c0 to %c10 step %c1 {
+    scf.if %arg0 {
+      scf.if %arg0 {
+      }
+    }
+  }
+  return
+}