diff --git a/mlir/include/mlir/Analysis/Presburger/Matrix.h b/mlir/include/mlir/Analysis/Presburger/Matrix.h
--- a/mlir/include/mlir/Analysis/Presburger/Matrix.h
+++ b/mlir/include/mlir/Analysis/Presburger/Matrix.h
@@ -72,7 +72,8 @@
   /// reallocations.
   void reserveRows(unsigned rows);
 
-  /// Get an ArrayRef corresponding to the specified row.
+  /// Get a [Mutable]ArrayRef corresponding to the specified row.
+  MutableArrayRef<int64_t> getRow(unsigned row);
   ArrayRef<int64_t> getRow(unsigned row) const;
 
   /// Insert columns having positions pos, pos + 1, ... pos + count - 1.
diff --git a/mlir/lib/Analysis/Presburger/Matrix.cpp b/mlir/lib/Analysis/Presburger/Matrix.cpp
--- a/mlir/lib/Analysis/Presburger/Matrix.cpp
+++ b/mlir/lib/Analysis/Presburger/Matrix.cpp
@@ -101,6 +101,10 @@
     std::swap(at(row, column), at(row, otherColumn));
 }
 
+MutableArrayRef<int64_t> Matrix::getRow(unsigned row) {
+  return {&data[row * nReservedColumns], nColumns};
+}
+
 ArrayRef<int64_t> Matrix::getRow(unsigned row) const {
   return {&data[row * nReservedColumns], nColumns};
 }