diff --git a/flang/lib/Semantics/check-omp-structure.h b/flang/lib/Semantics/check-omp-structure.h
--- a/flang/lib/Semantics/check-omp-structure.h
+++ b/flang/lib/Semantics/check-omp-structure.h
@@ -61,12 +61,16 @@
         Directive::OMPD_sections, Directive::OMPD_single} |
     doSet};
 static OmpDirectiveSet taskloopSet{
-    Directive::OMPD_taskloop, Directive::OMPD_taskloop_simd};
+    Directive::OMPD_taskloop, Directive::OMPD_taskloop_simd,
+    Directive::OMPD_tile, Directive::OMPD_unroll};
 static OmpDirectiveSet targetSet{Directive::OMPD_target,
     Directive::OMPD_target_parallel, Directive::OMPD_target_parallel_do,
     Directive::OMPD_target_parallel_do_simd, Directive::OMPD_target_simd,
     Directive::OMPD_target_teams, Directive::OMPD_target_teams_distribute,
-    Directive::OMPD_target_teams_distribute_simd};
+    Directive::OMPD_target_teams_distribute_simd,
+    Directive::OMPD_tile, OMPD_unroll};
+static OmpDirectiveSet tileSet{
+    Directive::OMPD_tile};
 static OmpDirectiveSet simdSet{Directive::OMPD_distribute_parallel_do_simd,
     Directive::OMPD_distribute_simd, Directive::OMPD_parallel_do_simd,
     Directive::OMPD_do_simd, Directive::OMPD_simd,
@@ -85,6 +89,8 @@
     Directive::OMPD_teams_distribute_simd};
 static OmpDirectiveSet taskGeneratingSet{
     OmpDirectiveSet{Directive::OMPD_task} | taskloopSet};
+static OmpDirectiveSet unrollSet{
+    Directive::OMPD_unroll};
 static OmpDirectiveSet nestedOrderedErrSet{Directive::OMPD_critical,
     Directive::OMPD_ordered, Directive::OMPD_atomic, Directive::OMPD_task,
     Directive::OMPD_taskloop};
@@ -200,6 +206,10 @@
   void HasInvalidTeamsNesting(
       const llvm::omp::Directive &dir, const parser::CharBlock &source);
   void HasInvalidDistributeNesting(const parser::OpenMPLoopConstruct &x);
+  bool HasInvalidTileNesting(
+      const llvm::omp::Directive &dir, const parser::CharBlock &source);
+  bool HasInvalidUnrollNesting(
+      const llvm::omp::Directive &dir, const parser::CharBlock &source);
   // specific clause related
   bool ScheduleModifierHasType(const parser::OmpScheduleClause &,
       const parser::OmpScheduleModifierType::ModType &);
@@ -250,6 +260,9 @@
       const parser::DefinedOperator::IntrinsicOperator &);
   void CheckReductionTypeList(const parser::OmpClause::Reduction &);
   void CheckMasterNesting(const parser::OpenMPBlockConstruct &x);
+  void CheckTheDepthTileNesting(const parser::OpenMPBlockConstruct &x);
+  void CheckTheRectangleTileNesting(const parser::OpenMPBlockConstruct &x);
+  void CheckThePerfectNesting(const parser::OpenMPBlockConstruct &x);
   void ChecksOnOrderedAsBlock();
   void CheckBarrierNesting(const parser::OpenMPSimpleStandaloneConstruct &x);
   void ChecksOnOrderedAsStandalone();