diff --git a/clang/include/clang/Basic/Attr.td b/clang/include/clang/Basic/Attr.td
@@ -2200,6 +2200,15 @@ def BTFTypeTag : TypeAttr {
   let LangOpts = [COnly];
 }
 
+def BPFFastCall : InheritableAttr,
+                  TargetSpecificAttr<TargetBPF> {
+  let Spellings = [Clang<"bpf_fastcall">];
+  let Subjects = SubjectList<[FunctionLike]>;
+  let Documentation = [BPFFastCallDocs];
+  let LangOpts = [COnly];
+  let SimpleHandler = 1;
+}
+
 def WebAssemblyExportName : InheritableAttr,
                             TargetSpecificAttr<TargetWebAssembly> {
   let Spellings = [Clang<"export_name">];
@@ -4467,7 +4476,7 @@ def ReleaseHandle : InheritableParamAttr {
 
 def UnsafeBufferUsage : InheritableAttr {
   let Spellings = [Clang<"unsafe_buffer_usage">];
-  let Subjects = SubjectList<[Function]>;
+  let Subjects = SubjectList<[Function, Field]>;
   let Documentation = [UnsafeBufferUsageDocs];
 }
 
@@ -4529,7 +4538,7 @@ def HLSLSV_GroupIndex: HLSLAnnotationAttr {
 
 def HLSLResourceBinding: InheritableAttr {
   let Spellings = [HLSLAnnotation<"register">];
-  let Subjects = SubjectList<[HLSLBufferObj, ExternalGlobalVar]>;
+  let Subjects = SubjectList<[HLSLBufferObj, ExternalGlobalVar], ErrorDiag>;
   let LangOpts = [HLSL];
   let Args = [StringArgument<"Slot">, StringArgument<"Space", 1>];
   let Documentation = [HLSLResourceBindingDocs];
@@ -4599,15 +4608,21 @@ def HLSLResource : InheritableAttr {
           "CBuffer", "Sampler", "TBuffer", "RTAccelerationStructure",
           "FeedbackTexture2D", "FeedbackTexture2DArray"
         ],
-        /*opt=*/0, /*fake=*/0, /*isExternalType=*/1, /*isCovered=*/0>,
-    DefaultBoolArgument<"isROV", /*default=*/0>
+        /*opt=*/0, /*fake=*/0, /*isExternalType=*/1, /*isCovered=*/0>
   ];
   let Documentation = [InternalOnly];
 }
 
+def HLSLROV : InheritableAttr {
+  let Spellings = [CXX11<"hlsl", "is_rov">];
+  let Subjects = SubjectList<[Struct]>;
+  let LangOpts = [HLSL]; 
+  let Documentation = [InternalOnly];
+}
+
 def HLSLResourceClass : InheritableAttr {
   let Spellings = [CXX11<"hlsl", "resource_class">];
-  let Subjects = SubjectList<[Struct]>;
+  let Subjects = SubjectList<[Field]>;
   let LangOpts = [HLSL];
   let Args = [
 	EnumArgument<"ResourceClass", "llvm::hlsl::ResourceClass",

diff --git a/clang/include/clang/Basic/AttrDocs.td b/clang/include/clang/Basic/AttrDocs.td
@@ -2345,6 +2345,25 @@ section.
   }];
 }
 
+def BPFFastCallDocs : Documentation {
+  let Category = DocCatType;
+  let Content = [{
+Functions annotated with this attribute are likely to be inlined by BPF JIT.
+It is assumed that inlined implementation uses less caller saved registers,
+than a regular function.
+Specifically, the following registers are likely to be preserved:
+- ``R0`` if function return value is ``void``;
+- ``R2-R5` if function takes 1 argument;
+- ``R3-R5` if function takes 2 arguments;
+- ``R4-R5` if function takes 3 arguments;
+- ``R5`` if function takes 4 arguments;
+
+For such functions Clang generates code pattern that allows BPF JIT
+to recognize and remove unnecessary spills and fills of the preserved
+registers.
+  }];
+}
+
 def MipsInterruptDocs : Documentation {
   let Category = DocCatFunction;
   let Heading = "interrupt (MIPS)";
@@ -6802,77 +6821,103 @@ def UnsafeBufferUsageDocs : Documentation {
   let Category = DocCatFunction;
   let Content = [{
 The attribute ``[[clang::unsafe_buffer_usage]]`` should be placed on functions
-that need to be avoided as they are prone to buffer overflows. It is designed to
-work together with the off-by-default compiler warning ``-Wunsafe-buffer-usage``
-to help codebases transition away from raw pointer based buffer management,
-in favor of safer abstractions such as C++20 ``std::span``. The attribute causes
-``-Wunsafe-buffer-usage`` to warn on every use of the function, and it may
-enable ``-Wunsafe-buffer-usage`` to emit automatic fix-it hints
-which would help the user replace such unsafe functions with safe
+that need to be avoided as they are prone to buffer overflows or unsafe buffer
+struct fields. It is designed to work together with the off-by-default compiler
+warning ``-Wunsafe-buffer-usage``to help codebases transition away from raw pointer
+based buffer management, in favor of safer abstractions such as C++20 ``std::span``.
+The attribute causes ``-Wunsafe-buffer-usage`` to warn on every use of the function or
+the field it is attached to, and it may also lead to emission of automatic fix-it
+hints which would help the user replace the use of unsafe functions(/fields) with safe
 alternatives, though the attribute can be used even when the fix can't be automated.
 
-The attribute does not suppress ``-Wunsafe-buffer-usage`` inside the function
-to which it is attached. These warnings still need to be addressed.
+* Attribute attached to functions: The attribute does not suppress 
+  ``-Wunsafe-buffer-usage`` inside the function to which it is attached. 
+  These warnings still need to be addressed.
 
-The attribute is warranted even if the only way a function can overflow
-the buffer is by violating the function's preconditions. For example, it
-would make sense to put the attribute on function ``foo()`` below because
-passing an incorrect size parameter would cause a buffer overflow:
+  The attribute is warranted even if the only way a function can overflow
+  the buffer is by violating the function's preconditions. For example, it
+  would make sense to put the attribute on function ``foo()`` below because
+  passing an incorrect size parameter would cause a buffer overflow:
 
-.. code-block:: c++
+  .. code-block:: c++
 
-  [[clang::unsafe_buffer_usage]]
-  void foo(int *buf, size_t size) {
-    for (size_t i = 0; i < size; ++i) {
-      buf[i] = i;
+    [[clang::unsafe_buffer_usage]]
+    void foo(int *buf, size_t size) {
+      for (size_t i = 0; i < size; ++i) {
+        buf[i] = i;
+      }
     }
-  }
 
-The attribute is NOT warranted when the function uses safe abstractions,
-assuming that these abstractions weren't misused outside the function.
-For example, function ``bar()`` below doesn't need the attribute,
-because assuming that the container ``buf`` is well-formed (has size that
-fits the original buffer it refers to), overflow cannot occur:
+  The attribute is NOT warranted when the function uses safe abstractions,
+  assuming that these abstractions weren't misused outside the function.
+  For example, function ``bar()`` below doesn't need the attribute,
+  because assuming that the container ``buf`` is well-formed (has size that
+  fits the original buffer it refers to), overflow cannot occur:
 
-.. code-block:: c++
+  .. code-block:: c++
 
-  void bar(std::span<int> buf) {
-    for (size_t i = 0; i < buf.size(); ++i) {
-      buf[i] = i;
+    void bar(std::span<int> buf) {
+      for (size_t i = 0; i < buf.size(); ++i) {
+        buf[i] = i;
+      }
     }
-  }
 
-In this case function ``bar()`` enables the user to keep the buffer
-"containerized" in a span for as long as possible. On the other hand,
-Function ``foo()`` in the previous example may have internal
-consistency, but by accepting a raw buffer it requires the user to unwrap
-their span, which is undesirable according to the programming model
-behind ``-Wunsafe-buffer-usage``.
+  In this case function ``bar()`` enables the user to keep the buffer
+  "containerized" in a span for as long as possible. On the other hand,
+  Function ``foo()`` in the previous example may have internal
+  consistency, but by accepting a raw buffer it requires the user to unwrap
+  their span, which is undesirable according to the programming model
+  behind ``-Wunsafe-buffer-usage``.
 
-The attribute is warranted when a function accepts a raw buffer only to
-immediately put it into a span:
+  The attribute is warranted when a function accepts a raw buffer only to
+  immediately put it into a span:
 
-.. code-block:: c++
+  .. code-block:: c++
 
-  [[clang::unsafe_buffer_usage]]
-  void baz(int *buf, size_t size) {
-    std::span<int> sp{ buf, size };
-    for (size_t i = 0; i < sp.size(); ++i) {
-      sp[i] = i;
+    [[clang::unsafe_buffer_usage]]
+    void baz(int *buf, size_t size) {
+      std::span<int> sp{ buf, size };
+      for (size_t i = 0; i < sp.size(); ++i) {
+        sp[i] = i;
+      }
     }
-  }
 
-In this case ``baz()`` does not contain any unsafe operations, but the awkward
-parameter type causes the caller to unwrap the span unnecessarily.
-Note that regardless of the attribute, code inside ``baz()`` isn't flagged
-by ``-Wunsafe-buffer-usage`` as unsafe. It is definitely undesirable,
-but if ``baz()`` is on an API surface, there is no way to improve it
-to make it as safe as ``bar()`` without breaking the source and binary
-compatibility with existing users of the function. In such cases
-the proper solution would be to create a different function (possibly
-an overload of ``baz()``) that accepts a safe container like ``bar()``,
-and then use the attribute on the original ``baz()`` to help the users
-update their code to use the new function.
+  In this case ``baz()`` does not contain any unsafe operations, but the awkward
+  parameter type causes the caller to unwrap the span unnecessarily.
+  Note that regardless of the attribute, code inside ``baz()`` isn't flagged
+  by ``-Wunsafe-buffer-usage`` as unsafe. It is definitely undesirable,
+  but if ``baz()`` is on an API surface, there is no way to improve it
+  to make it as safe as ``bar()`` without breaking the source and binary
+  compatibility with existing users of the function. In such cases
+  the proper solution would be to create a different function (possibly
+  an overload of ``baz()``) that accepts a safe container like ``bar()``,
+  and then use the attribute on the original ``baz()`` to help the users
+  update their code to use the new function.
+
+* Attribute attached to fields: The attribute should only be attached to 
+  struct fields, if the fields can not be updated to a safe type with bounds 
+  check, such as std::span. In other words, the buffers prone to unsafe accesses 
+  should always be updated to use safe containers/views and attaching the attribute 
+  must be last resort when such an update is infeasible.
+
+  The attribute can be placed on individual fields or a set of them as shown below.
+
+  .. code-block:: c++
+
+    struct A {
+      [[clang::unsafe_buffer_usage]]
+      int *ptr1;
+
+      [[clang::unsafe_buffer_usage]]
+      int *ptr2, buf[10];
+
+      [[clang::unsafe_buffer_usage]]
+      size_t sz;
+    };
+
+  Here, every read/write to the fields ptr1, ptr2, buf and sz will trigger a warning 
+  that the field has been explcitly marked as unsafe due to unsafe-buffer operations.
+
   }];
 }
 

diff --git a/clang/include/clang/Basic/Builtins.td b/clang/include/clang/Basic/Builtins.td
@@ -533,42 +533,42 @@ def BuiltinComplex : Builtin {
 def IsGreater : Builtin {
   let Spellings = ["__builtin_isgreater"];
   let Attributes = [FunctionWithBuiltinPrefix, NoThrow, Const,
-                    CustomTypeChecking];
+                    CustomTypeChecking, Constexpr];
   let Prototype = "int(...)";
 }
 
 def IsGreaterEqual : Builtin {
   let Spellings = ["__builtin_isgreaterequal"];
   let Attributes = [FunctionWithBuiltinPrefix, NoThrow, Const,
-                    CustomTypeChecking];
+                    CustomTypeChecking, Constexpr];
   let Prototype = "int(...)";
 }
 
 def IsLess : Builtin {
   let Spellings = ["__builtin_isless"];
   let Attributes = [FunctionWithBuiltinPrefix, NoThrow, Const,
-                    CustomTypeChecking];
+                    CustomTypeChecking, Constexpr];
   let Prototype = "int(...)";
 }
 
 def IsLessEqual : Builtin {
   let Spellings = ["__builtin_islessequal"];
   let Attributes = [FunctionWithBuiltinPrefix, NoThrow, Const,
-                    CustomTypeChecking];
+                    CustomTypeChecking, Constexpr];
   let Prototype = "int(...)";
 }
 
 def IsLessGreater : Builtin {
   let Spellings = ["__builtin_islessgreater"];
   let Attributes = [FunctionWithBuiltinPrefix, NoThrow, Const,
-                    CustomTypeChecking];
+                    CustomTypeChecking, Constexpr];
   let Prototype = "int(...)";
 }
 
 def IsUnordered : Builtin {
   let Spellings = ["__builtin_isunordered"];
   let Attributes = [FunctionWithBuiltinPrefix, NoThrow, Const,
-                    CustomTypeChecking];
+                    CustomTypeChecking, Constexpr];
   let Prototype = "int(...)";
 }
 
@@ -646,19 +646,21 @@ def IsFPClass : Builtin {
 def Signbit : Builtin {
   let Spellings = ["__builtin_signbit"];
   let Attributes = [FunctionWithBuiltinPrefix, NoThrow, Const,
-                    CustomTypeChecking];
+                    CustomTypeChecking, Constexpr];
   let Prototype = "int(...)";
 }
 
 def SignbitF : Builtin {
   let Spellings = ["__builtin_signbitf"];
-  let Attributes = [FunctionWithBuiltinPrefix, NoThrow, Const];
+  let Attributes = [FunctionWithBuiltinPrefix, NoThrow, Const,
+                    Constexpr];
   let Prototype = "int(float)";
 }
 
 def SignbitL : Builtin {
   let Spellings = ["__builtin_signbitl"];
-  let Attributes = [FunctionWithBuiltinPrefix, NoThrow, Const];
+  let Attributes = [FunctionWithBuiltinPrefix, NoThrow, Const,
+                    Constexpr];
   let Prototype = "int(long double)";
 }
 
@@ -4743,6 +4745,12 @@ def HLSLRSqrt : LangBuiltin<"HLSL_LANG"> {
   let Prototype = "void(...)";
 }
 
+def HLSLSaturate : LangBuiltin<"HLSL_LANG"> {
+  let Spellings = ["__builtin_hlsl_elementwise_saturate"];
+  let Attributes = [NoThrow, Const];
+  let Prototype = "void(...)";
+}
+
 // Builtins for XRay.
 def XRayCustomEvent : Builtin {
   let Spellings = ["__xray_customevent"];

diff --git a/clang/include/clang/Basic/BuiltinsNVPTX.def b/clang/include/clang/Basic/BuiltinsNVPTX.def
@@ -584,6 +584,21 @@ TARGET_BUILTIN(__nvvm_f2bf16_rz_relu, "yf", "", AND(SM_80,PTX70))
 
 TARGET_BUILTIN(__nvvm_f2tf32_rna, "ZUif", "", AND(SM_80,PTX70))
 
+TARGET_BUILTIN(__nvvm_ff_to_e4m3x2_rn, "sff", "", AND(SM_89,PTX81))
+TARGET_BUILTIN(__nvvm_ff_to_e4m3x2_rn_relu, "sff", "", AND(SM_89,PTX81))
+TARGET_BUILTIN(__nvvm_ff_to_e5m2x2_rn, "sff", "", AND(SM_89,PTX81))
+TARGET_BUILTIN(__nvvm_ff_to_e5m2x2_rn_relu, "sff", "", AND(SM_89,PTX81))
+
+TARGET_BUILTIN(__nvvm_f16x2_to_e4m3x2_rn, "sV2h", "", AND(SM_89,PTX81))
+TARGET_BUILTIN(__nvvm_f16x2_to_e4m3x2_rn_relu, "sV2h", "", AND(SM_89,PTX81))
+TARGET_BUILTIN(__nvvm_f16x2_to_e5m2x2_rn, "sV2h", "", AND(SM_89,PTX81))
+TARGET_BUILTIN(__nvvm_f16x2_to_e5m2x2_rn_relu, "sV2h", "", AND(SM_89,PTX81))
+
+TARGET_BUILTIN(__nvvm_e4m3x2_to_f16x2_rn, "V2hs", "", AND(SM_89,PTX81))
+TARGET_BUILTIN(__nvvm_e4m3x2_to_f16x2_rn_relu, "V2hs", "", AND(SM_89,PTX81))
+TARGET_BUILTIN(__nvvm_e5m2x2_to_f16x2_rn, "V2hs", "", AND(SM_89,PTX81))
+TARGET_BUILTIN(__nvvm_e5m2x2_to_f16x2_rn_relu, "V2hs", "", AND(SM_89,PTX81))
+
 // Bitcast
 
 BUILTIN(__nvvm_bitcast_f2i, "if", "")

diff --git a/clang/include/clang/Basic/BuiltinsWebAssembly.def b/clang/include/clang/Basic/BuiltinsWebAssembly.def
@@ -135,10 +135,10 @@ TARGET_BUILTIN(__builtin_wasm_min_f64x2, "V2dV2dV2d", "nc", "simd128")
 TARGET_BUILTIN(__builtin_wasm_max_f64x2, "V2dV2dV2d", "nc", "simd128")
 TARGET_BUILTIN(__builtin_wasm_pmin_f64x2, "V2dV2dV2d", "nc", "simd128")
 TARGET_BUILTIN(__builtin_wasm_pmax_f64x2, "V2dV2dV2d", "nc", "simd128")
-TARGET_BUILTIN(__builtin_wasm_min_f16x8, "V8hV8hV8h", "nc", "half-precision")
-TARGET_BUILTIN(__builtin_wasm_max_f16x8, "V8hV8hV8h", "nc", "half-precision")
-TARGET_BUILTIN(__builtin_wasm_pmin_f16x8, "V8hV8hV8h", "nc", "half-precision")
-TARGET_BUILTIN(__builtin_wasm_pmax_f16x8, "V8hV8hV8h", "nc", "half-precision")
+TARGET_BUILTIN(__builtin_wasm_min_f16x8, "V8hV8hV8h", "nc", "fp16")
+TARGET_BUILTIN(__builtin_wasm_max_f16x8, "V8hV8hV8h", "nc", "fp16")
+TARGET_BUILTIN(__builtin_wasm_pmin_f16x8, "V8hV8hV8h", "nc", "fp16")
+TARGET_BUILTIN(__builtin_wasm_pmax_f16x8, "V8hV8hV8h", "nc", "fp16")
 
 TARGET_BUILTIN(__builtin_wasm_ceil_f32x4, "V4fV4f", "nc", "simd128")
 TARGET_BUILTIN(__builtin_wasm_floor_f32x4, "V4fV4f", "nc", "simd128")
@@ -170,8 +170,8 @@ TARGET_BUILTIN(__builtin_wasm_relaxed_madd_f32x4, "V4fV4fV4fV4f", "nc", "relaxed
 TARGET_BUILTIN(__builtin_wasm_relaxed_nmadd_f32x4, "V4fV4fV4fV4f", "nc", "relaxed-simd")
 TARGET_BUILTIN(__builtin_wasm_relaxed_madd_f64x2, "V2dV2dV2dV2d", "nc", "relaxed-simd")
 TARGET_BUILTIN(__builtin_wasm_relaxed_nmadd_f64x2, "V2dV2dV2dV2d", "nc", "relaxed-simd")
-TARGET_BUILTIN(__builtin_wasm_relaxed_madd_f16x8, "V8hV8hV8hV8h", "nc", "half-precision")
-TARGET_BUILTIN(__builtin_wasm_relaxed_nmadd_f16x8, "V8hV8hV8hV8h", "nc", "half-precision")
+TARGET_BUILTIN(__builtin_wasm_relaxed_madd_f16x8, "V8hV8hV8hV8h", "nc", "fp16")
+TARGET_BUILTIN(__builtin_wasm_relaxed_nmadd_f16x8, "V8hV8hV8hV8h", "nc", "fp16")
 
 TARGET_BUILTIN(__builtin_wasm_relaxed_laneselect_i8x16, "V16ScV16ScV16ScV16Sc", "nc", "relaxed-simd")
 TARGET_BUILTIN(__builtin_wasm_relaxed_laneselect_i16x8, "V8sV8sV8sV8s", "nc", "relaxed-simd")
@@ -197,11 +197,11 @@ TARGET_BUILTIN(__builtin_wasm_relaxed_dot_i8x16_i7x16_add_s_i32x4, "V4iV16ScV16S
 TARGET_BUILTIN(__builtin_wasm_relaxed_dot_bf16x8_add_f32_f32x4, "V4fV8UsV8UsV4f", "nc", "relaxed-simd")
 
 // Half-Precision (fp16)
-TARGET_BUILTIN(__builtin_wasm_loadf16_f32, "fh*", "nU", "half-precision")
-TARGET_BUILTIN(__builtin_wasm_storef16_f32, "vfh*", "n", "half-precision")
-TARGET_BUILTIN(__builtin_wasm_splat_f16x8, "V8hf", "nc", "half-precision")
-TARGET_BUILTIN(__builtin_wasm_extract_lane_f16x8, "fV8hi", "nc", "half-precision")
-TARGET_BUILTIN(__builtin_wasm_replace_lane_f16x8, "V8hV8hif", "nc", "half-precision")
+TARGET_BUILTIN(__builtin_wasm_loadf16_f32, "fh*", "nU", "fp16")
+TARGET_BUILTIN(__builtin_wasm_storef16_f32, "vfh*", "n", "fp16")
+TARGET_BUILTIN(__builtin_wasm_splat_f16x8, "V8hf", "nc", "fp16")
+TARGET_BUILTIN(__builtin_wasm_extract_lane_f16x8, "fV8hi", "nc", "fp16")
+TARGET_BUILTIN(__builtin_wasm_replace_lane_f16x8, "V8hV8hif", "nc", "fp16")
 
 // Reference Types builtins
 // Some builtins are custom type-checked - see 't' as part of the third argument,

diff --git a/clang/include/clang/Basic/BuiltinsX86.def b/clang/include/clang/Basic/BuiltinsX86.def
@@ -2217,6 +2217,50 @@ TARGET_BUILTIN(__builtin_ia32_vcvttps2ibs512_mask, "V16UiV16fV16UiUsIi", "nV:512
 TARGET_BUILTIN(__builtin_ia32_vcvttps2iubs128_mask, "V4UiV4fV4UiUc", "nV:128:", "avx10.2-256")
 TARGET_BUILTIN(__builtin_ia32_vcvttps2iubs256_mask, "V8UiV8fV8UiUcIi", "nV:256:", "avx10.2-256")
 TARGET_BUILTIN(__builtin_ia32_vcvttps2iubs512_mask, "V16UiV16fV16UiUsIi", "nV:512:", "avx10.2-512")
+
+// AVX10.2 CONVERT
+TARGET_BUILTIN(__builtin_ia32_vcvt2ps2phx128_mask, "V8xV4fV4fV8xUc", "ncV:128:", "avx10.2-256")
+TARGET_BUILTIN(__builtin_ia32_vcvt2ps2phx256_mask, "V16xV8fV8fV16xUsIi", "ncV:256:", "avx10.2-256")
+TARGET_BUILTIN(__builtin_ia32_vcvt2ps2phx512_mask, "V32xV16fV16fV32xUiIi", "ncV:512:", "avx10.2-512")
+TARGET_BUILTIN(__builtin_ia32_vcvtbiasph2bf8_128_mask, "V16cV16cV8xV16cUc", "nV:128:", "avx10.2-256")
+TARGET_BUILTIN(__builtin_ia32_vcvtbiasph2bf8_256_mask, "V16cV32cV16xV16cUs", "nV:256:", "avx10.2-256")
+TARGET_BUILTIN(__builtin_ia32_vcvtbiasph2bf8_512_mask, "V32cV64cV32xV32cUi", "nV:512:", "avx10.2-512")
+TARGET_BUILTIN(__builtin_ia32_vcvtbiasph2bf8s_128_mask, "V16cV16cV8xV16cUc", "nV:128:", "avx10.2-256")
+TARGET_BUILTIN(__builtin_ia32_vcvtbiasph2bf8s_256_mask, "V16cV32cV16xV16cUs", "nV:256:", "avx10.2-256")
+TARGET_BUILTIN(__builtin_ia32_vcvtbiasph2bf8s_512_mask, "V32cV64cV32xV32cUi", "nV:512:", "avx10.2-512")
+TARGET_BUILTIN(__builtin_ia32_vcvtbiasph2hf8_128_mask, "V16cV16cV8xV16cUc", "nV:128:", "avx10.2-256")
+TARGET_BUILTIN(__builtin_ia32_vcvtbiasph2hf8_256_mask, "V16cV32cV16xV16cUs", "nV:256:", "avx10.2-256")
+TARGET_BUILTIN(__builtin_ia32_vcvtbiasph2hf8_512_mask, "V32cV64cV32xV32cUi", "nV:512:", "avx10.2-512")
+TARGET_BUILTIN(__builtin_ia32_vcvtbiasph2hf8s_128_mask, "V16cV16cV8xV16cUc", "nV:128:", "avx10.2-256")
+TARGET_BUILTIN(__builtin_ia32_vcvtbiasph2hf8s_256_mask, "V16cV32cV16xV16cUs", "nV:256:", "avx10.2-256")
+TARGET_BUILTIN(__builtin_ia32_vcvtbiasph2hf8s_512_mask, "V32cV64cV32xV32cUi", "nV:512:", "avx10.2-512")
+TARGET_BUILTIN(__builtin_ia32_vcvtne2ph2bf8_128, "V16cV8xV8x", "nV:128:", "avx10.2-256")
+TARGET_BUILTIN(__builtin_ia32_vcvtne2ph2bf8_256, "V32cV16xV16x", "nV:256:", "avx10.2-256")
+TARGET_BUILTIN(__builtin_ia32_vcvtne2ph2bf8_512, "V64cV32xV32x", "nV:512:", "avx10.2-512")
+TARGET_BUILTIN(__builtin_ia32_vcvtne2ph2bf8s_128, "V16cV8xV8x", "nV:128:", "avx10.2-256")
+TARGET_BUILTIN(__builtin_ia32_vcvtne2ph2bf8s_256, "V32cV16xV16x", "nV:256:", "avx10.2-256")
+TARGET_BUILTIN(__builtin_ia32_vcvtne2ph2bf8s_512, "V64cV32xV32x", "nV:512:", "avx10.2-512")
+TARGET_BUILTIN(__builtin_ia32_vcvtne2ph2hf8_128, "V16cV8xV8x", "nV:128:", "avx10.2-256")
+TARGET_BUILTIN(__builtin_ia32_vcvtne2ph2hf8_256, "V32cV16xV16x", "nV:256:", "avx10.2-256")
+TARGET_BUILTIN(__builtin_ia32_vcvtne2ph2hf8_512, "V64cV32xV32x", "nV:512:", "avx10.2-512")
+TARGET_BUILTIN(__builtin_ia32_vcvtne2ph2hf8s_128, "V16cV8xV8x", "nV:128:", "avx10.2-256")
+TARGET_BUILTIN(__builtin_ia32_vcvtne2ph2hf8s_256, "V32cV16xV16x", "nV:256:", "avx10.2-256")
+TARGET_BUILTIN(__builtin_ia32_vcvtne2ph2hf8s_512, "V64cV32xV32x", "nV:512:", "avx10.2-512")
+TARGET_BUILTIN(__builtin_ia32_vcvthf8_2ph128_mask, "V8xV16cV8xUc", "nV:128:", "avx10.2-256")
+TARGET_BUILTIN(__builtin_ia32_vcvthf8_2ph256_mask, "V16xV16cV16xUs", "nV:256:", "avx10.2-256")
+TARGET_BUILTIN(__builtin_ia32_vcvthf8_2ph512_mask, "V32xV32cV32xUi", "nV:512:", "avx10.2-512")
+TARGET_BUILTIN(__builtin_ia32_vcvtneph2bf8_128_mask, "V16cV8xV16cUc", "nV:128:", "avx10.2-256")
+TARGET_BUILTIN(__builtin_ia32_vcvtneph2bf8_256_mask, "V16cV16xV16cUs", "nV:256:", "avx10.2-256")
+TARGET_BUILTIN(__builtin_ia32_vcvtneph2bf8_512_mask, "V32cV32xV32cUi", "nV:512:", "avx10.2-512")
+TARGET_BUILTIN(__builtin_ia32_vcvtneph2bf8s_128_mask, "V16cV8xV16cUc", "nV:128:", "avx10.2-256")
+TARGET_BUILTIN(__builtin_ia32_vcvtneph2bf8s_256_mask, "V16cV16xV16cUs", "nV:256:", "avx10.2-256")
+TARGET_BUILTIN(__builtin_ia32_vcvtneph2bf8s_512_mask, "V32cV32xV32cUi", "nV:512:", "avx10.2-512")
+TARGET_BUILTIN(__builtin_ia32_vcvtneph2hf8_128_mask, "V16cV8xV16cUc", "nV:128:", "avx10.2-256")
+TARGET_BUILTIN(__builtin_ia32_vcvtneph2hf8_256_mask, "V16cV16xV16cUs", "nV:256:", "avx10.2-256")
+TARGET_BUILTIN(__builtin_ia32_vcvtneph2hf8_512_mask, "V32cV32xV32cUi", "nV:512:", "avx10.2-512")
+TARGET_BUILTIN(__builtin_ia32_vcvtneph2hf8s_128_mask, "V16cV8xV16cUc", "nV:128:", "avx10.2-256")
+TARGET_BUILTIN(__builtin_ia32_vcvtneph2hf8s_256_mask, "V16cV16xV16cUs", "nV:256:", "avx10.2-256")
+TARGET_BUILTIN(__builtin_ia32_vcvtneph2hf8s_512_mask, "V32cV32xV32cUi", "nV:512:", "avx10.2-512")
 #undef BUILTIN
 #undef TARGET_BUILTIN
 #undef TARGET_HEADER_BUILTIN
diff --git a/clang/include/clang/Basic/CodeGenOptions.def b/clang/include/clang/Basic/CodeGenOptions.def
@@ -37,8 +37,7 @@ VALUE_CODEGENOPT(Name, Bits, Default)
 
 CODEGENOPT(DisableIntegratedAS, 1, 0) ///< -no-integrated-as
 CODEGENOPT(Crel, 1, 0) ///< -Wa,--crel
-CODEGENOPT(RelaxELFRelocations, 1, 1) ///< -Wa,-mrelax-relocations={yes,no}
-CODEGENOPT(SSE2AVX          , 1, 0)   ///< -msse2avx
+CODEGENOPT(ImplicitMapSyms, 1, 0) ///< -Wa,-mmapsyms=implicit
 CODEGENOPT(AsmVerbose        , 1, 0) ///< -dA, -fverbose-asm.
 CODEGENOPT(PreserveAsmComments, 1, 1) ///< -dA, -fno-preserve-as-comments.
 CODEGENOPT(AssumeSaneOperatorNew , 1, 1) ///< implicit __attribute__((malloc)) operator new
@@ -178,6 +177,7 @@ CODEGENOPT(MergeAllConstants , 1, 1) ///< Merge identical constants.
 CODEGENOPT(MergeFunctions    , 1, 0) ///< Set when -fmerge-functions is enabled.
 CODEGENOPT(NoCommon          , 1, 0) ///< Set when -fno-common or C++ is enabled.
 CODEGENOPT(NoExecStack       , 1, 0) ///< Set when -Wa,--noexecstack is enabled.
+CODEGENOPT(MipsMsa           , 1, 0) ///< Set when -Wa,-mmsa is enabled.
 CODEGENOPT(FatalWarnings     , 1, 0) ///< Set when -Wa,--fatal-warnings is
                                      ///< enabled.
 CODEGENOPT(NoWarn            , 1, 0) ///< Set when -Wa,--no-warn is enabled.
@@ -194,6 +194,8 @@ CODEGENOPT(HIPSaveKernelArgName, 1, 0) ///< Set when -fhip-kernel-arg-name is en
 CODEGENOPT(UniqueInternalLinkageNames, 1, 0) ///< Internal Linkage symbols get unique names.
 CODEGENOPT(SplitMachineFunctions, 1, 0) ///< Split machine functions using profile information.
 CODEGENOPT(PPCUseFullRegisterNames, 1, 0) ///< Print full register names in assembly
+CODEGENOPT(X86RelaxRelocations, 1, 1) ///< -Wa,-mrelax-relocations={yes,no}
+CODEGENOPT(X86Sse2Avx        , 1, 0)   ///< -Wa,-msse2avx
 
 /// When false, this attempts to generate code as if the result of an
 /// overflowing conversion matches the overflowing behavior of a target's native

diff --git a/clang/include/clang/Basic/DiagnosticASTKinds.td b/clang/include/clang/Basic/DiagnosticASTKinds.td
@@ -333,7 +333,8 @@ def note_constexpr_new : Note<
 def note_constexpr_new_non_replaceable : Note<
   "call to %select{placement|class-specific}0 %1">;
 def note_constexpr_new_placement : Note<
-  "this placement new expression is not yet supported in constant expressions">;
+  "this placement new expression is not supported in constant expressions "
+  "%select{|before C++2c}0">;
 def note_constexpr_placement_new_wrong_type : Note<
   "placement new would change type of storage from %0 to %1">;
 def note_constexpr_new_negative : Note<
@@ -394,10 +395,9 @@ def warn_integer_constant_overflow : Warning<
 def warn_fixedpoint_constant_overflow : Warning<
   "overflow in expression; result is %0 with type %1">,
   InGroup<DiagGroup<"fixed-point-overflow">>;
-def warn_constexpr_unscoped_enum_out_of_range : Warning<
+def note_constexpr_unscoped_enum_out_of_range : Note<
   "integer value %0 is outside the valid range of values [%1, %2] for the "
-  "enumeration type %3">, DefaultError, ShowInSystemHeader, ShowInSystemMacro,
-  InGroup<DiagGroup<"enum-constexpr-conversion">>;
+  "enumeration type %3">;
 
 // This is a temporary diagnostic, and shall be removed once our
 // implementation is complete, and like the preceding constexpr notes belongs

diff --git a/clang/include/clang/Basic/DiagnosticDriverKinds.td b/clang/include/clang/Basic/DiagnosticDriverKinds.td
@@ -604,9 +604,6 @@ def warn_drv_unsupported_gpopt : Warning<
   "ignoring '-mgpopt' option as it cannot be used with %select{|the implicit"
   " usage of }0-mabicalls">,
   InGroup<UnsupportedGPOpt>;
-def warn_drv_unsupported_sdata : Warning<
-  "ignoring '-msmall-data-limit=' with -mcmodel=large for -fpic or RV64">,
-  InGroup<OptionIgnored>;
 def warn_drv_unsupported_longcalls : Warning<
   "ignoring '-mlong-calls' option as it is not currently supported with "
   "%select{|the implicit usage of }0-mabicalls">,

diff --git a/clang/include/clang/Basic/DiagnosticGroups.td b/clang/include/clang/Basic/DiagnosticGroups.td
@@ -1547,6 +1547,9 @@ def DXILValidation : DiagGroup<"dxil-validation">;
 // Warning for HLSL API availability
 def HLSLAvailability : DiagGroup<"hlsl-availability">;
 
+// Warnings for legacy binding behavior
+def LegacyConstantRegisterBinding : DiagGroup<"legacy-constant-register-binding">;
+
 // Warnings and notes related to const_var_decl_type attribute checks
 def ReadOnlyPlacementChecks : DiagGroup<"read-only-types">;
 

diff --git a/clang/include/clang/Basic/DiagnosticParseKinds.td b/clang/include/clang/Basic/DiagnosticParseKinds.td
@@ -481,6 +481,9 @@ def ext_decomp_decl_empty : ExtWarn<
   "ISO C++17 does not allow a decomposition group to be empty">,
   InGroup<DiagGroup<"empty-decomposition">>;
 
+def err_function_parameter_limit_exceeded : Error<
+  "too many function parameters; subsequent parameters will be ignored">;
+
 // C++26 structured bindings
 def ext_decl_attrs_on_binding : ExtWarn<
   "an attribute specifier sequence attached to a structured binding declaration "
@@ -965,6 +968,15 @@ def warn_cxx23_delete_with_message : Warning<
   "'= delete' with a message is incompatible with C++ standards before C++2c">,
   DefaultIgnore, InGroup<CXXPre26Compat>;
 
+def ext_variadic_friends : ExtWarn<
+  "variadic 'friend' declarations are a C++2c extension">, InGroup<CXX26>;
+def warn_cxx23_variadic_friends : Warning<
+  "variadic 'friend' declarations are incompatible with C++ standards before C++2c">,
+  DefaultIgnore, InGroup<CXXPre26Compat>;
+
+def err_friend_concept : Error<
+  "friend declaration cannot be a concept">;
+
 // C++11 default member initialization
 def ext_nonstatic_member_init : ExtWarn<
   "default member initializer for non-static data member is a C++11 "

diff --git a/clang/include/clang/Basic/DiagnosticSemaKinds.td b/clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -1741,6 +1741,10 @@ def ext_friend_tag_redecl_outside_namespace : ExtWarn<
   "enclosing namespace is a Microsoft extension; add a nested name specifier">,
   InGroup<MicrosoftUnqualifiedFriend>;
 def err_pure_friend : Error<"friend declaration cannot have a pure-specifier">;
+def err_friend_template_decl_multiple_specifiers: Error<
+  "a friend declaration that befriends a template must contain exactly one type-specifier">;
+def friend_template_decl_malformed_pack_expansion : Error<
+  "friend declaration expands pack %0 that is declared it its own template parameter list">;
 
 def err_invalid_base_in_interface : Error<
   "interface type cannot inherit from "
@@ -3012,6 +3016,8 @@ def err_concept_no_parameters : Error<
   "specialization of concepts is not allowed">;
 def err_concept_extra_headers : Error<
   "extraneous template parameter list in concept definition">;
+def err_recursive_concept : Error<
+  "a concept definition cannot refer to itself">;
 def err_concept_no_associated_constraints : Error<
   "concept cannot have associated constraints">;
 def err_non_constant_constraint_expression : Error<
@@ -5426,7 +5432,8 @@ def err_template_spec_extra_headers : Error<
   "extraneous template parameter list in template specialization or "
   "out-of-line template definition">;
 def ext_template_spec_extra_headers : ExtWarn<
-  "extraneous template parameter list in template specialization">;
+  "extraneous template parameter list in template specialization">,
+   InGroup<DiagGroup<"extraneous-template-head">>, DefaultError;
 def note_explicit_template_spec_does_not_need_header : Note<
   "'template<>' header not required for explicitly-specialized class %0 "
   "declared here">;
@@ -5660,6 +5667,8 @@ def err_explicit_instantiation_internal_linkage : Error<
 def err_explicit_instantiation_not_known : Error<
   "explicit instantiation of %0 does not refer to a function template, "
   "variable template, member function, member class, or static data member">;
+def err_explicit_instantiation_no_candidate : Error<
+    "no viable candidate for explicit instantiation of %0">;
 def note_explicit_instantiation_here : Note<
   "explicit instantiation refers here">;
 def err_explicit_instantiation_data_member_not_instantiated : Error<
@@ -8968,6 +8977,8 @@ def err_atomic_op_has_invalid_synch_scope : Error<
 def warn_atomic_implicit_seq_cst : Warning<
   "implicit use of sequentially-consistent atomic may incur stronger memory barriers than necessary">,
   InGroup<DiagGroup<"atomic-implicit-seq-cst">>, DefaultIgnore;
+def err_atomic_unsupported : Error<
+  "atomic types are not supported in '%0'">;
 
 def err_overflow_builtin_must_be_int : Error<
   "operand argument to %select{overflow builtin|checked integer operation}0 "
@@ -9354,9 +9365,6 @@ let CategoryName = "Inline Assembly Issue" in {
     "invalid input size for constraint '%0'">;
   def err_asm_invalid_output_size : Error<
     "invalid output size for constraint '%0'">;
-  def err_invalid_asm_cast_lvalue : Error<
-    "invalid use of a cast in a inline asm context requiring an lvalue: "
-    "remove the cast or build with -fheinous-gnu-extensions">;
   def err_invalid_asm_value_for_constraint
       : Error <"value '%0' out of range for constraint '%1'">;
   def err_asm_non_addr_value_in_memory_constraint : Error <
@@ -9370,9 +9378,8 @@ let CategoryName = "Inline Assembly Issue" in {
   def warn_asm_label_on_auto_decl : Warning<
     "ignored asm label '%0' on automatic variable">;
   def warn_invalid_asm_cast_lvalue : Warning<
-    "invalid use of a cast in an inline asm context requiring an lvalue: "
-    "accepted due to -fheinous-gnu-extensions, but clang may remove support "
-    "for this in the future">;
+    "invalid use of a cast in an inline asm context requiring an lvalue">,
+    InGroup<DiagGroup<"invalid-gnu-asm-cast">>, DefaultError;
   def warn_asm_mismatched_size_modifier : Warning<
     "value size does not match register size specified by the constraint "
     "and modifier">,
@@ -9747,7 +9754,7 @@ def err_defaulted_special_member_quals : Error<
   "have 'const'%select{, 'constexpr'|}1 or 'volatile' qualifiers">;
 def err_defaulted_special_member_explicit_object_mismatch : Error<
   "the type of the explicit object parameter of an explicitly-defaulted "
-  "%select{copy|move}0 assignment operator should match the type of the class %1">;
+  "%select{copy|move}0 assignment operator should be reference to %1">;
 def err_defaulted_special_member_volatile_param : Error<
   "the parameter for an explicitly-defaulted %sub{select_special_member_kind}0 "
   "may not be volatile">;
@@ -10057,8 +10064,9 @@ def warn_null_ret : Warning<
   InGroup<NonNull>;
 
 def err_lifetimebound_no_object_param : Error<
-  "'lifetimebound' attribute cannot be applied; %select{static |non-}0member "
-  "function has no implicit object parameter">;
+  "'lifetimebound' attribute cannot be applied; "
+  "%select{non-|static |explicit object }0"
+  "member function has no implicit object parameter">;
 def err_lifetimebound_ctor_dtor : Error<
   "'lifetimebound' attribute cannot be applied to a "
   "%select{constructor|destructor}0">;
@@ -11155,6 +11163,8 @@ def err_omp_loop_diff_cxx : Error<
   "upper and lower loop bounds">;
 def err_omp_loop_cannot_use_stmt : Error<
   "'%0' statement cannot be used in OpenMP for loop">;
+def err_omp_loop_bad_collapse_var : Error<
+  "cannot use variable %1 in collapsed imperfectly-nested loop %select{init|condition|increment}0 statement">;
 def err_omp_simd_region_cannot_use_stmt : Error<
   "'%0' statement cannot be used in OpenMP simd region">;
 def warn_omp_loop_64_bit_var : Warning<
@@ -12338,7 +12348,13 @@ def err_hlsl_missing_semantic_annotation : Error<
 def err_hlsl_init_priority_unsupported : Error<
   "initializer priorities are not supported in HLSL">;
 
-def err_hlsl_unsupported_register_type : Error<"invalid resource class specifier '%0' used; expected 'b', 's', 't', or 'u'">;
+def warn_hlsl_user_defined_type_missing_member: Warning<"binding type '%select{t|u|b|s|c}0' only applies to types containing %select{SRV resources|UAV resources|constant buffer resources|sampler state|numeric types}0">, InGroup<LegacyConstantRegisterBinding>;
+def err_hlsl_binding_type_mismatch: Error<"binding type '%select{t|u|b|s|c}0' only applies to %select{SRV resources|UAV resources|constant buffer resources|sampler state|numeric variables in the global scope}0">;
+def err_hlsl_binding_type_invalid: Error<"binding type '%0' is invalid">;
+def err_hlsl_duplicate_register_annotation: Error<"binding type '%select{t|u|b|s|c|i}0' cannot be applied more than once">;
+def warn_hlsl_register_type_c_packoffset: Warning<"binding type 'c' ignored in buffer declaration. Did you mean 'packoffset'?">, InGroup<LegacyConstantRegisterBinding>, DefaultError;
+def warn_hlsl_deprecated_register_type_b: Warning<"binding type 'b' only applies to constant buffers. The 'bool constant' binding type is no longer supported">, InGroup<LegacyConstantRegisterBinding>, DefaultError;
+def warn_hlsl_deprecated_register_type_i: Warning<"binding type 'i' ignored. The 'integer constant' binding type is no longer supported">, InGroup<LegacyConstantRegisterBinding>, DefaultError;
 def err_hlsl_unsupported_register_number : Error<"register number should be an integer">;
 def err_hlsl_expected_space : Error<"invalid space specifier '%0' used; expected 'space' followed by an integer, like space1">;
 def warn_hlsl_packoffset_mix : Warning<"cannot mix packoffset elements with nonpackoffset elements in a cbuffer">,
@@ -12381,7 +12397,8 @@ def warn_unsafe_buffer_variable : Warning<
   InGroup<UnsafeBufferUsage>, DefaultIgnore;
 def warn_unsafe_buffer_operation : Warning<
   "%select{unsafe pointer operation|unsafe pointer arithmetic|"
-  "unsafe buffer access|function introduces unsafe buffer manipulation|unsafe invocation of span::data}0">,
+  "unsafe buffer access|function introduces unsafe buffer manipulation|unsafe invocation of span::data|"
+  "field %1 prone to unsafe buffer manipulation}0">,
   InGroup<UnsafeBufferUsage>, DefaultIgnore;
 def note_unsafe_buffer_operation : Note<
   "used%select{| in pointer arithmetic| in buffer access}0 here">;

diff --git a/clang/include/clang/Basic/DiagnosticSerializationKinds.td b/clang/include/clang/Basic/DiagnosticSerializationKinds.td
@@ -134,6 +134,12 @@ def warn_module_system_bit_conflict : Warning<
   "as a non-system module; any difference in diagnostic options will be ignored">,
   InGroup<ModuleConflict>;
 
+def warn_decls_in_multiple_modules : Warning<
+  "declaration %0 is detected to be defined in multiple module units, first is from '%1' and second is from '%2'; "
+  "the compiler may not be good at merging the definitions. ">,
+  InGroup<DiagGroup<"decls-in-multiple-modules">>,
+  DefaultIgnore;
+
 def err_failed_to_find_module_file : Error<
   "failed to find module file for module '%0'">;
 } // let CategoryName

diff --git a/clang/include/clang/Basic/LangOptions.def b/clang/include/clang/Basic/LangOptions.def
@@ -190,7 +190,6 @@ LANGOPT(POSIXThreads      , 1, 0, "POSIX thread support")
 LANGOPT(Blocks            , 1, 0, "blocks extension to C")
 BENIGN_LANGOPT(EmitAllDecls      , 1, 0, "emitting all declarations")
 LANGOPT(MathErrno         , 1, 1, "errno in math functions")
-BENIGN_LANGOPT(HeinousExtensions , 1, 0, "extensions that we really don't like and may be ripped out at any time")
 LANGOPT(Modules           , 1, 0, "modules semantics")
 COMPATIBLE_LANGOPT(CPlusPlusModules, 1, 0, "C++ modules syntax")
 LANGOPT(SkipODRCheckInGMF, 1, 0, "Skip ODR checks for decls in the global module fragment")

diff --git a/clang/include/clang/Basic/LangOptions.h b/clang/include/clang/Basic/LangOptions.h
@@ -367,6 +367,23 @@ class LangOptionsBase {
     PerThread,
   };
 
+  /// Exclude certain code patterns from being instrumented by arithmetic
+  /// overflow sanitizers
+  enum OverflowPatternExclusionKind {
+    /// Don't exclude any overflow patterns from sanitizers
+    None = 1 << 0,
+    /// Exclude all overflow patterns (below)
+    All = 1 << 1,
+    /// if (a + b < a)
+    AddSignedOverflowTest = 1 << 2,
+    /// if (a + b < a)
+    AddUnsignedOverflowTest = 1 << 3,
+    /// -1UL
+    NegUnsignedConst = 1 << 4,
+    /// while (count--)
+    PostDecrInWhile = 1 << 5,
+  };
+
   enum class DefaultVisiblityExportMapping {
     None,
     /// map only explicit default visibilities to exported
@@ -555,6 +572,11 @@ class LangOptions : public LangOptionsBase {
   /// The default stream kind used for HIP kernel launching.
   GPUDefaultStreamKind GPUDefaultStream;
 
+  /// Which overflow patterns should be excluded from sanitizer instrumentation
+  unsigned OverflowPatternExclusionMask = 0;
+
+  std::vector<std::string> OverflowPatternExclusionValues;
+
   /// The seed used by the randomize structure layout feature.
   std::string RandstructSeed;
 
@@ -630,6 +652,14 @@ class LangOptions : public LangOptionsBase {
     return MSCompatibilityVersion >= MajorVersion * 100000U;
   }
 
+  bool isOverflowPatternExcluded(OverflowPatternExclusionKind Kind) const {
+    if (OverflowPatternExclusionMask & OverflowPatternExclusionKind::None)
+      return false;
+    if (OverflowPatternExclusionMask & OverflowPatternExclusionKind::All)
+      return true;
+    return OverflowPatternExclusionMask & Kind;
+  }
+
   /// Reset all of the options that are not considered when building a
   /// module.
   void resetNonModularOptions();

diff --git a/clang/include/clang/Basic/Sanitizers.def b/clang/include/clang/Basic/Sanitizers.def
@@ -79,6 +79,9 @@ SANITIZER("thread", Thread)
 // Numerical stability sanitizer.
 SANITIZER("numerical", NumericalStability)
 
+// RealtimeSanitizer
+SANITIZER("realtime", Realtime)
+
 // LeakSanitizer
 SANITIZER("leak", Leak)
 

diff --git a/clang/include/clang/Basic/TokenKinds.def b/clang/include/clang/Basic/TokenKinds.def
@@ -502,6 +502,7 @@ TYPE_TRAIT_1(__has_trivial_move_assign, HasTrivialMoveAssign, KEYCXX)
 TYPE_TRAIT_1(__has_trivial_move_constructor, HasTrivialMoveConstructor, KEYCXX)
 
 // GNU and MS Type Traits
+TYPE_TRAIT_1(__builtin_is_implicit_lifetime, IsImplicitLifetime, KEYCXX)
 TYPE_TRAIT_2(__builtin_is_virtual_base_of, IsVirtualBaseOf, KEYCXX)
 TYPE_TRAIT_1(__has_nothrow_assign, HasNothrowAssign, KEYCXX)
 TYPE_TRAIT_1(__has_nothrow_copy, HasNothrowCopy, KEYCXX)

diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
@@ -1011,6 +1011,8 @@ def Wwrite_strings : Flag<["-"], "Wwrite-strings">, Group<W_Group>,
   Flags<[HelpHidden]>, Visibility<[ClangOption, CC1Option]>;
 def Wno_write_strings : Flag<["-"], "Wno-write-strings">, Group<W_Group>,
   Flags<[HelpHidden]>, Visibility<[ClangOption, CC1Option]>;
+def Winvalid_gnu_asm_cast : Flag<["-"], "Winvalid-gnu-asm-cast">, Group<W_Group>,
+  Flags<[HelpHidden]>, Visibility<[ClangOption, CC1Option]>;
 def W_Joined : Joined<["-"], "W">, Group<W_Group>,
   Visibility<[ClangOption, CC1Option, CLOption, DXCOption, FC1Option, FlangOption]>,
   MetaVarName<"<warning>">, HelpText<"Enable the specified warning">;
@@ -2565,6 +2567,11 @@ defm sanitize_stats : BoolOption<"f", "sanitize-stats",
           "Disable">,
   BothFlags<[], [ClangOption], " sanitizer statistics gathering.">>,
   Group<f_clang_Group>;
+def fsanitize_undefined_ignore_overflow_pattern_EQ : CommaJoined<["-"], "fsanitize-undefined-ignore-overflow-pattern=">,
+  HelpText<"Specify the overflow patterns to exclude from artihmetic sanitizer instrumentation">,
+  Visibility<[ClangOption, CC1Option]>,
+  Values<"none,all,add-unsigned-overflow-test,add-signed-overflow-test,negated-unsigned-const,unsigned-post-decr-while">,
+  MarshallingInfoStringVector<LangOpts<"OverflowPatternExclusionValues">>;
 def fsanitize_thread_memory_access : Flag<["-"], "fsanitize-thread-memory-access">,
                                      Group<f_clang_Group>,
                                      HelpText<"Enable memory access instrumentation in ThreadSanitizer (default)">;
@@ -2756,9 +2763,13 @@ defm gnu89_inline : BoolFOption<"gnu89-inline",
   NegFlag<SetFalse>>, ShouldParseIf<!strconcat("!", cplusplus.KeyPath)>;
 def fgnu_runtime : Flag<["-"], "fgnu-runtime">, Group<f_Group>,
   HelpText<"Generate output compatible with the standard GNU Objective-C runtime">;
+// This used to be a standalone flag but is now mapped to
+// -Wno-error=invalid-gnu-asm-cast, which is the only thing the flag used to
+// control.
 def fheinous_gnu_extensions : Flag<["-"], "fheinous-gnu-extensions">,
-  Visibility<[ClangOption, CC1Option]>,
-  MarshallingInfoFlag<LangOpts<"HeinousExtensions">>;
+  Alias<W_Joined>, AliasArgs<["no-error=invalid-gnu-asm-cast"]>,
+  HelpText<"(Deprecated) Controls whether '-Winvalid-gnu-asm-cast' defaults to "
+           "an error or a warning">;
 def filelist : Separate<["-"], "filelist">, Flags<[LinkerInput]>,
                Group<Link_Group>;
 def : Flag<["-"], "findirect-virtual-calls">, Alias<fapple_kext>;
@@ -5028,8 +5039,8 @@ def mexception_handing : Flag<["-"], "mexception-handling">, Group<m_wasm_Featur
 def mno_exception_handing : Flag<["-"], "mno-exception-handling">, Group<m_wasm_Features_Group>;
 def mextended_const : Flag<["-"], "mextended-const">, Group<m_wasm_Features_Group>;
 def mno_extended_const : Flag<["-"], "mno-extended-const">, Group<m_wasm_Features_Group>;
-def mhalf_precision : Flag<["-"], "mhalf-precision">, Group<m_wasm_Features_Group>;
-def mno_half_precision : Flag<["-"], "mno-half-precision">, Group<m_wasm_Features_Group>;
+def mfp16 : Flag<["-"], "mfp16">, Group<m_wasm_Features_Group>;
+def mno_fp16 : Flag<["-"], "mno-fp16">, Group<m_wasm_Features_Group>;
 def mmultimemory : Flag<["-"], "mmultimemory">, Group<m_wasm_Features_Group>;
 def mno_multimemory : Flag<["-"], "mno-multimemory">, Group<m_wasm_Features_Group>;
 def mmultivalue : Flag<["-"], "mmultivalue">, Group<m_wasm_Features_Group>;
@@ -5231,7 +5242,7 @@ let Flags = [TargetSpecific] in {
 def msse2avx : Flag<["-"], "msse2avx">, Group<m_Group>,
   Visibility<[ClangOption, CC1Option, CC1AsOption]>,
   HelpText<"Specify that the assembler should encode SSE instructions with VEX prefix">,
-  MarshallingInfoFlag<CodeGenOpts<"SSE2AVX">>;
+  MarshallingInfoFlag<CodeGenOpts<"X86Sse2Avx">>;
 } // let Flags = [TargetSpecific]
 
 defm zvector : BoolFOption<"zvector",
@@ -5383,7 +5394,9 @@ def mmadd4 : Flag<["-"], "mmadd4">, Group<m_mips_Features_Group>,
 def mno_madd4 : Flag<["-"], "mno-madd4">, Group<m_mips_Features_Group>,
   HelpText<"Disable the generation of 4-operand madd.s, madd.d and related instructions.">;
 def mmsa : Flag<["-"], "mmsa">, Group<m_mips_Features_Group>,
-  HelpText<"Enable MSA ASE (MIPS only)">;
+  Visibility<[ClangOption, CC1Option, CC1AsOption]>,
+  HelpText<"Enable MSA ASE (MIPS only)">,
+  MarshallingInfoFlag<CodeGenOpts<"MipsMsa">>;
 def mno_msa : Flag<["-"], "mno-msa">, Group<m_mips_Features_Group>,
   HelpText<"Disable MSA ASE (MIPS only)">;
 def mmt : Flag<["-"], "mmt">, Group<m_mips_Features_Group>,
@@ -6144,6 +6157,14 @@ def mvis3 : Flag<["-"], "mvis3">, Group<m_sparc_Features_Group>;
 def mno_vis3 : Flag<["-"], "mno-vis3">, Group<m_sparc_Features_Group>;
 def mhard_quad_float : Flag<["-"], "mhard-quad-float">, Group<m_sparc_Features_Group>;
 def msoft_quad_float : Flag<["-"], "msoft-quad-float">, Group<m_sparc_Features_Group>;
+def mv8plus : Flag<["-"], "mv8plus">, Group<m_sparc_Features_Group>,
+  HelpText<"Enable V8+ mode, allowing use of 64-bit V9 instructions in 32-bit code">;
+def mno_v8plus : Flag<["-"], "mno-v8plus">, Group<m_sparc_Features_Group>,
+  HelpText<"Disable V8+ mode">;
+def mfix_gr712rc : Flag<["-"], "mfix-gr712rc">, Group<m_sparc_Features_Group>,
+  HelpText<"Enable workarounds for GR712RC errata">;
+def mfix_ut700 : Flag<["-"], "mfix-ut700">, Group<m_sparc_Features_Group>,
+  HelpText<"Enable workarounds for UT700 errata">;
 foreach i = 1 ... 7 in
   def ffixed_g#i : Flag<["-"], "ffixed-g"#i>, Group<m_sparc_Features_Group>,
     HelpText<"Reserve the G"#i#" register (SPARC only)">;
@@ -7127,9 +7148,15 @@ def massembler_fatal_warnings : Flag<["-"], "massembler-fatal-warnings">,
 def crel : Flag<["--"], "crel">,
   HelpText<"Enable CREL relocation format (ELF only)">,
   MarshallingInfoFlag<CodeGenOpts<"Crel">>;
+def mmapsyms_implicit : Flag<["-"], "mmapsyms=implicit">,
+  HelpText<"Allow mapping symbol at section beginning to be implicit, "
+    "lowering number of mapping symbols at the expense of some "
+    "portability. Recommended for projects that can build all their "
+    "object files using this option">,
+  MarshallingInfoFlag<CodeGenOpts<"ImplicitMapSyms">>;
 def mrelax_relocations_no : Flag<["-"], "mrelax-relocations=no">,
     HelpText<"Disable x86 relax relocations">,
-    MarshallingInfoNegativeFlag<CodeGenOpts<"RelaxELFRelocations">>;
+    MarshallingInfoNegativeFlag<CodeGenOpts<"X86RelaxRelocations">>;
 def msave_temp_labels : Flag<["-"], "msave-temp-labels">,
   HelpText<"Save temporary labels in the symbol table. "
            "Note this may change .s semantics and shouldn't generally be used "
@@ -8836,7 +8863,7 @@ def dxil_validator_version : Option<["/", "-"], "validator-version", KIND_SEPARA
   Visibility<[DXCOption, ClangOption, CC1Option]>,
   HelpText<"Override validator version for module. Format: <major.minor>;"
            "Default: DXIL.dll version or current internal version">,
-  MarshallingInfoString<TargetOpts<"DxilValidatorVersion">>;
+  MarshallingInfoString<TargetOpts<"DxilValidatorVersion">, "\"1.8\"">;
 def target_profile : DXCJoinedOrSeparate<"T">, MetaVarName<"<profile>">,
   HelpText<"Set target profile">,
   Values<"ps_6_0, ps_6_1, ps_6_2, ps_6_3, ps_6_4, ps_6_5, ps_6_6, ps_6_7,"

diff --git a/clang/include/clang/Driver/SanitizerArgs.h b/clang/include/clang/Driver/SanitizerArgs.h
@@ -33,6 +33,7 @@ class SanitizerArgs {
   std::vector<std::string> BinaryMetadataIgnorelistFiles;
   int CoverageFeatures = 0;
   int BinaryMetadataFeatures = 0;
+  int OverflowPatternExclusions = 0;
   int MsanTrackOrigins = 0;
   bool MsanUseAfterDtor = true;
   bool MsanParamRetval = true;
@@ -106,6 +107,7 @@ class SanitizerArgs {
   bool needsNsanRt() const {
     return Sanitizers.has(SanitizerKind::NumericalStability);
   }
+  bool needsRtsanRt() const { return Sanitizers.has(SanitizerKind::Realtime); }
 
   bool hasMemTag() const {
     return hasMemtagHeap() || hasMemtagStack() || hasMemtagGlobals();

diff --git a/clang/include/clang/ExtractAPI/API.h b/clang/include/clang/ExtractAPI/API.h
@@ -19,21 +19,13 @@
 #define LLVM_CLANG_EXTRACTAPI_API_H
 
 #include "clang/AST/Availability.h"
-#include "clang/AST/Decl.h"
 #include "clang/AST/DeclBase.h"
-#include "clang/AST/DeclObjC.h"
 #include "clang/AST/RawCommentList.h"
 #include "clang/Basic/SourceLocation.h"
-#include "clang/Basic/Specifiers.h"
 #include "clang/ExtractAPI/DeclarationFragments.h"
-#include "llvm/ADT/ArrayRef.h"
-#include "llvm/ADT/MapVector.h"
-#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/Support/Allocator.h"
 #include "llvm/Support/Casting.h"
-#include "llvm/Support/Compiler.h"
-#include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/raw_ostream.h"
 #include "llvm/TargetParser/Triple.h"
 #include <cstddef>
 #include <iterator>
@@ -328,6 +320,8 @@ class RecordContext {
   /// chain.
   void stealRecordChain(RecordContext &Other);
 
+  void removeFromRecordChain(APIRecord *Record);
+
   APIRecord::RecordKind getKind() const { return Kind; }
 
   struct record_iterator {
@@ -1426,10 +1420,15 @@ class APISet {
   typename std::enable_if_t<std::is_base_of_v<APIRecord, RecordTy>, RecordTy> *
   createRecord(StringRef USR, StringRef Name, CtorArgsContTy &&...CtorArgs);
 
-  ArrayRef<const APIRecord *> getTopLevelRecords() const {
-    return TopLevelRecords;
+  auto getTopLevelRecords() const {
+    return llvm::iterator_range<decltype(TopLevelRecords)::iterator>(
+        TopLevelRecords);
   }
 
+  void removeRecord(StringRef USR);
+
+  void removeRecord(APIRecord *Record);
+
   APISet(const llvm::Triple &Target, Language Lang,
          const std::string &ProductName)
       : Target(Target), Lang(Lang), ProductName(ProductName) {}
@@ -1456,7 +1455,7 @@ class APISet {
   // lives in the BumpPtrAllocator.
   using APIRecordStoredPtr = std::unique_ptr<APIRecord, APIRecordDeleter>;
   llvm::DenseMap<StringRef, APIRecordStoredPtr> USRBasedLookupTable;
-  std::vector<const APIRecord *> TopLevelRecords;
+  llvm::SmallPtrSet<const APIRecord *, 32> TopLevelRecords;
 
 public:
   const std::string ProductName;
@@ -1482,7 +1481,7 @@ APISet::createRecord(StringRef USR, StringRef Name,
             dyn_cast_if_present<RecordContext>(Record->Parent.Record))
       ParentContext->addToRecordChain(Record);
     else
-      TopLevelRecords.push_back(Record);
+      TopLevelRecords.insert(Record);
   } else {
     Record = dyn_cast<RecordTy>(Result.first->second.get());
   }

diff --git a/clang/include/clang/ExtractAPI/ExtractAPIVisitor.h b/clang/include/clang/ExtractAPI/ExtractAPIVisitor.h
@@ -40,6 +40,8 @@ namespace impl {
 
 template <typename Derived>
 class ExtractAPIVisitorBase : public RecursiveASTVisitor<Derived> {
+  using Base = RecursiveASTVisitor<Derived>;
+
 protected:
   ExtractAPIVisitorBase(ASTContext &Context, APISet &API)
       : Context(Context), API(API) {}
@@ -81,8 +83,10 @@ class ExtractAPIVisitorBase : public RecursiveASTVisitor<Derived> {
 
   bool VisitNamespaceDecl(const NamespaceDecl *Decl);
 
+  bool TraverseRecordDecl(RecordDecl *Decl);
   bool VisitRecordDecl(const RecordDecl *Decl);
 
+  bool TraverseCXXRecordDecl(CXXRecordDecl *Decl);
   bool VisitCXXRecordDecl(const CXXRecordDecl *Decl);
 
   bool VisitCXXMethodDecl(const CXXMethodDecl *Decl);
@@ -240,7 +244,7 @@ class ExtractAPIVisitorBase : public RecursiveASTVisitor<Derived> {
 
   bool isEmbeddedInVarDeclarator(const TagDecl &D) {
     return D.getName().empty() && getTypedefName(&D).empty() &&
-           D.isEmbeddedInDeclarator();
+           D.isEmbeddedInDeclarator() && !D.isFreeStanding();
   }
 
   void maybeMergeWithAnonymousTag(const DeclaratorDecl &D,
@@ -252,8 +256,10 @@ class ExtractAPIVisitorBase : public RecursiveASTVisitor<Derived> {
     clang::index::generateUSRForDecl(Tag, TagUSR);
     if (auto *Record = llvm::dyn_cast_if_present<TagRecord>(
             API.findRecordForUSR(TagUSR))) {
-      if (Record->IsEmbeddedInVarDeclarator)
+      if (Record->IsEmbeddedInVarDeclarator) {
         NewRecordContext->stealRecordChain(*Record);
+        API.removeRecord(Record);
+      }
     }
   }
 };
@@ -548,6 +554,19 @@ bool ExtractAPIVisitorBase<Derived>::VisitNamespaceDecl(
   return true;
 }
 
+template <typename Derived>
+bool ExtractAPIVisitorBase<Derived>::TraverseRecordDecl(RecordDecl *Decl) {
+  bool Ret = Base::TraverseRecordDecl(Decl);
+
+  if (!isEmbeddedInVarDeclarator(*Decl) && Decl->isAnonymousStructOrUnion()) {
+    SmallString<128> USR;
+    index::generateUSRForDecl(Decl, USR);
+    API.removeRecord(USR);
+  }
+
+  return Ret;
+}
+
 template <typename Derived>
 bool ExtractAPIVisitorBase<Derived>::VisitRecordDecl(const RecordDecl *Decl) {
   if (!getDerivedExtractAPIVisitor().shouldDeclBeIncluded(Decl))
@@ -588,6 +607,20 @@ bool ExtractAPIVisitorBase<Derived>::VisitRecordDecl(const RecordDecl *Decl) {
   return true;
 }
 
+template <typename Derived>
+bool ExtractAPIVisitorBase<Derived>::TraverseCXXRecordDecl(
+    CXXRecordDecl *Decl) {
+  bool Ret = Base::TraverseCXXRecordDecl(Decl);
+
+  if (!isEmbeddedInVarDeclarator(*Decl) && Decl->isAnonymousStructOrUnion()) {
+    SmallString<128> USR;
+    index::generateUSRForDecl(Decl, USR);
+    API.removeRecord(USR);
+  }
+
+  return Ret;
+}
+
 template <typename Derived>
 bool ExtractAPIVisitorBase<Derived>::VisitCXXRecordDecl(
     const CXXRecordDecl *Decl) {

diff --git a/clang/include/clang/Format/Format.h b/clang/include/clang/Format/Format.h
@@ -659,7 +659,7 @@ struct FormatStyle {
 
   /// If the function declaration doesn't fit on a line,
   /// allow putting all parameters of a function declaration onto
-  /// the next line even if ``BinPackParameters`` is ``false``.
+  /// the next line even if ``BinPackParameters`` is ``OnePerLine``.
   /// \code
   ///   true:
   ///   void myFunction(
@@ -1192,20 +1192,36 @@ struct FormatStyle {
   /// \version 3.7
   bool BinPackArguments;
 
-  /// If ``false``, a function declaration's or function definition's
-  /// parameters will either all be on the same line or will have one line each.
-  /// \code
-  ///   true:
-  ///   void f(int aaaaaaaaaaaaaaaaaaaa, int aaaaaaaaaaaaaaaaaaaa,
-  ///          int aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa) {}
-  ///
-  ///   false:
-  ///   void f(int aaaaaaaaaaaaaaaaaaaa,
-  ///          int aaaaaaaaaaaaaaaaaaaa,
-  ///          int aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa) {}
-  /// \endcode
+  /// Different way to try to fit all parameters on a line.
+  enum BinPackParametersStyle : int8_t {
+    /// Bin-pack parameters.
+    /// \code
+    ///    void f(int a, int bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb,
+    ///           int ccccccccccccccccccccccccccccccccccccccccccc);
+    /// \endcode
+    BPPS_BinPack,
+    /// Put all parameters on the current line if they fit.
+    /// Otherwise, put each one on its own line.
+    /// \code
+    ///    void f(int a, int b, int c);
+    ///
+    ///    void f(int a,
+    ///           int b,
+    ///           int ccccccccccccccccccccccccccccccccccccc);
+    /// \endcode
+    BPPS_OnePerLine,
+    /// Always put each parameter on its own line.
+    /// \code
+    ///    void f(int a,
+    ///           int b,
+    ///           int c);
+    /// \endcode
+    BPPS_AlwaysOnePerLine,
+  };
+
+  /// The bin pack parameters style to use.
   /// \version 3.7
-  bool BinPackParameters;
+  BinPackParametersStyle BinPackParameters;
 
   /// Styles for adding spacing around ``:`` in bitfield definitions.
   enum BitFieldColonSpacingStyle : int8_t {
@@ -2858,7 +2874,8 @@ struct FormatStyle {
   PPDirectiveIndentStyle IndentPPDirectives;
 
   /// Indent the requires clause in a template. This only applies when
-  /// ``RequiresClausePosition`` is ``OwnLine``, or ``WithFollowing``.
+  /// ``RequiresClausePosition`` is ``OwnLine``, ``OwnLineWithBrace``,
+  /// or ``WithFollowing``.
   ///
   /// In clang-format 12, 13 and 14 it was named ``IndentRequires``.
   /// \code
@@ -3413,7 +3430,7 @@ struct FormatStyle {
   /// items into as few lines as possible when they go over ``ColumnLimit``.
   ///
   /// If ``Auto`` (the default), delegates to the value in
-  /// ``BinPackParameters``. If that is ``true``, bin-packs Objective-C
+  /// ``BinPackParameters``. If that is ``BinPack``, bin-packs Objective-C
   /// protocol conformance list items into as few lines as possible
   /// whenever they go over ``ColumnLimit``.
   ///
@@ -3425,13 +3442,13 @@ struct FormatStyle {
   /// onto individual lines whenever they go over ``ColumnLimit``.
   ///
   /// \code{.objc}
-  ///    Always (or Auto, if BinPackParameters=true):
+  ///    Always (or Auto, if BinPackParameters==BinPack):
   ///    @interface ccccccccccccc () <
   ///        ccccccccccccc, ccccccccccccc,
   ///        ccccccccccccc, ccccccccccccc> {
   ///    }
   ///
-  ///    Never (or Auto, if BinPackParameters=false):
+  ///    Never (or Auto, if BinPackParameters!=BinPack):
   ///    @interface ddddddddddddd () <
   ///        ddddddddddddd,
   ///        ddddddddddddd,
@@ -3944,22 +3961,45 @@ struct FormatStyle {
   /// ``IndentRequires`` option is only used if the ``requires`` is put on the
   /// start of a line.
   enum RequiresClausePositionStyle : int8_t {
-    /// Always put the ``requires`` clause on its own line.
+    /// Always put the ``requires`` clause on its own line (possibly followed by
+    /// a semicolon).
     /// \code
     ///   template <typename T>
-    ///   requires C<T>
+    ///     requires C<T>
     ///   struct Foo {...
     ///
     ///   template <typename T>
-    ///   requires C<T>
+    ///   void bar(T t)
+    ///     requires C<T>;
+    ///
+    ///   template <typename T>
+    ///     requires C<T>
     ///   void bar(T t) {...
     ///
     ///   template <typename T>
     ///   void baz(T t)
-    ///   requires C<T>
+    ///     requires C<T>
     ///   {...
     /// \endcode
     RCPS_OwnLine,
+    /// As with ``OwnLine``, except, unless otherwise prohibited, place a
+    /// following open brace (of a function definition) to follow on the same
+    /// line.
+    /// \code
+    ///   void bar(T t)
+    ///     requires C<T> {
+    ///     return;
+    ///   }
+    ///
+    ///   void bar(T t)
+    ///     requires C<T> {}
+    ///
+    ///   template <typename T>
+    ///     requires C<T>
+    ///   void baz(T t) {
+    ///     ...
+    /// \endcode
+    RCPS_OwnLineWithBrace,
     /// Try to put the clause together with the preceding part of a declaration.
     /// For class templates: stick to the template declaration.
     /// For function templates: stick to the template declaration.

diff --git a/clang/include/clang/Parse/Parser.h b/clang/include/clang/Parse/Parser.h
@@ -3021,15 +3021,17 @@ class Parser : public CodeCompletionHandler {
           SemaCodeCompletion::AttributeCompletion::None,
       const IdentifierInfo *EnclosingScope = nullptr);
 
-  void MaybeParseHLSLAnnotations(Declarator &D,
+  bool MaybeParseHLSLAnnotations(Declarator &D,
                                  SourceLocation *EndLoc = nullptr,
                                  bool CouldBeBitField = false) {
     assert(getLangOpts().HLSL && "MaybeParseHLSLAnnotations is for HLSL only");
     if (Tok.is(tok::colon)) {
       ParsedAttributes Attrs(AttrFactory);
       ParseHLSLAnnotations(Attrs, EndLoc, CouldBeBitField);
       D.takeAttributes(Attrs);
+      return true;
     }
+    return false;
   }
 
   void MaybeParseHLSLAnnotations(ParsedAttributes &Attrs,

diff --git a/clang/include/clang/Rewrite/Core/DeltaTree.h b/clang/include/clang/Rewrite/Core/DeltaTree.h
diff --git a/clang/include/clang/Rewrite/Core/HTMLRewrite.h b/clang/include/clang/Rewrite/Core/HTMLRewrite.h
@@ -17,10 +17,13 @@
 #include "clang/Basic/SourceLocation.h"
 #include <string>
 
+namespace llvm {
+class RewriteBuffer;
+} // namespace llvm
+
 namespace clang {
 
 class Rewriter;
-class RewriteBuffer;
 class Preprocessor;
 
 namespace html {
@@ -53,9 +56,9 @@ namespace html {
 
   /// HighlightRange - This is the same as the above method, but takes
   /// decomposed file locations.
-  void HighlightRange(RewriteBuffer &RB, unsigned B, unsigned E,
-                      const char *BufferStart,
-                      const char *StartTag, const char *EndTag);
+  void HighlightRange(llvm::RewriteBuffer &RB, unsigned B, unsigned E,
+                      const char *BufferStart, const char *StartTag,
+                      const char *EndTag);
 
   /// EscapeText - HTMLize a specified file so that special characters are
   /// are translated so that they are not interpreted as HTML tags.

diff --git a/clang/include/clang/Rewrite/Core/RewriteRope.h b/clang/include/clang/Rewrite/Core/RewriteRope.h
diff --git a/clang/include/clang/Rewrite/Core/Rewriter.h b/clang/include/clang/Rewrite/Core/Rewriter.h
@@ -16,7 +16,7 @@
 
 #include "clang/Basic/LLVM.h"
 #include "clang/Basic/SourceLocation.h"
-#include "clang/Rewrite/Core/RewriteBuffer.h"
+#include "llvm/ADT/RewriteBuffer.h"
 #include "llvm/ADT/StringRef.h"
 #include <map>
 #include <string>
@@ -32,7 +32,7 @@ class SourceManager;
 class Rewriter {
   SourceManager *SourceMgr = nullptr;
   const LangOptions *LangOpts = nullptr;
-  std::map<FileID, RewriteBuffer> RewriteBuffers;
+  std::map<FileID, llvm::RewriteBuffer> RewriteBuffers;
 
 public:
   struct RewriteOptions {
@@ -49,7 +49,7 @@ class Rewriter {
     ///
     /// FIXME: This sometimes corrupts the file's rewrite buffer due to
     /// incorrect indexing in the implementation (see the FIXME in
-    /// clang::RewriteBuffer::RemoveText).  Moreover, it's inefficient because
+    /// llvm::RewriteBuffer::RemoveText).  Moreover, it's inefficient because
     /// it must scan the buffer from the beginning to find the start of the
     /// line.  When feasible, it's better for the caller to check for a blank
     /// line and then, if found, expand the removal range to include it.
@@ -62,8 +62,9 @@ class Rewriter {
     RewriteOptions() {}
   };
 
-  using buffer_iterator = std::map<FileID, RewriteBuffer>::iterator;
-  using const_buffer_iterator = std::map<FileID, RewriteBuffer>::const_iterator;
+  using buffer_iterator = std::map<FileID, llvm::RewriteBuffer>::iterator;
+  using const_buffer_iterator =
+      std::map<FileID, llvm::RewriteBuffer>::const_iterator;
 
   explicit Rewriter() = default;
   explicit Rewriter(SourceManager &SM, const LangOptions &LO)
@@ -191,13 +192,13 @@ class Rewriter {
   /// buffer, and allows you to write on it directly.  This is useful if you
   /// want efficient low-level access to apis for scribbling on one specific
   /// FileID's buffer.
-  RewriteBuffer &getEditBuffer(FileID FID);
+  llvm::RewriteBuffer &getEditBuffer(FileID FID);
 
   /// getRewriteBufferFor - Return the rewrite buffer for the specified FileID.
   /// If no modification has been made to it, return null.
-  const RewriteBuffer *getRewriteBufferFor(FileID FID) const {
-    std::map<FileID, RewriteBuffer>::const_iterator I =
-      RewriteBuffers.find(FID);
+  const llvm::RewriteBuffer *getRewriteBufferFor(FileID FID) const {
+    std::map<FileID, llvm::RewriteBuffer>::const_iterator I =
+        RewriteBuffers.find(FID);
     return I == RewriteBuffers.end() ? nullptr : &I->second;
   }
 

diff --git a/clang/include/clang/Sema/Sema.h b/clang/include/clang/Sema/Sema.h
diff --git a/clang/include/clang/Sema/SemaAMDGPU.h b/clang/include/clang/Sema/SemaAMDGPU.h
@@ -13,14 +13,13 @@
 #ifndef LLVM_CLANG_SEMA_SEMAAMDGPU_H
 #define LLVM_CLANG_SEMA_SEMAAMDGPU_H
 
-#include "clang/AST/Attr.h"
-#include "clang/AST/DeclBase.h"
-#include "clang/AST/Expr.h"
-#include "clang/Basic/AttributeCommonInfo.h"
-#include "clang/Sema/ParsedAttr.h"
+#include "clang/AST/ASTFwd.h"
 #include "clang/Sema/SemaBase.h"
 
 namespace clang {
+class AttributeCommonInfo;
+class ParsedAttr;
+
 class SemaAMDGPU : public SemaBase {
 public:
   SemaAMDGPU(Sema &S);

diff --git a/clang/include/clang/Sema/SemaARM.h b/clang/include/clang/Sema/SemaARM.h
@@ -13,15 +13,18 @@
 #ifndef LLVM_CLANG_SEMA_SEMAARM_H
 #define LLVM_CLANG_SEMA_SEMAARM_H
 
-#include "clang/AST/DeclBase.h"
-#include "clang/AST/Expr.h"
-#include "clang/Basic/TargetInfo.h"
+#include "clang/AST/ASTFwd.h"
 #include "clang/Sema/SemaBase.h"
-#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringRef.h"
 #include <tuple>
 
+namespace llvm {
+template <typename T, unsigned N> class SmallVector;
+} // namespace llvm
+
 namespace clang {
 class ParsedAttr;
+class TargetInfo;
 
 class SemaARM : public SemaBase {
 public:
@@ -60,10 +63,10 @@ class SemaARM : public SemaBase {
                             unsigned ExpectedFieldNum, bool AllowName);
   bool BuiltinARMMemoryTaggingCall(unsigned BuiltinID, CallExpr *TheCall);
 
-  bool MveAliasValid(unsigned BuiltinID, StringRef AliasName);
-  bool CdeAliasValid(unsigned BuiltinID, StringRef AliasName);
-  bool SveAliasValid(unsigned BuiltinID, StringRef AliasName);
-  bool SmeAliasValid(unsigned BuiltinID, StringRef AliasName);
+  bool MveAliasValid(unsigned BuiltinID, llvm::StringRef AliasName);
+  bool CdeAliasValid(unsigned BuiltinID, llvm::StringRef AliasName);
+  bool SveAliasValid(unsigned BuiltinID, llvm::StringRef AliasName);
+  bool SmeAliasValid(unsigned BuiltinID, llvm::StringRef AliasName);
   void handleBuiltinAliasAttr(Decl *D, const ParsedAttr &AL);
   void handleNewAttr(Decl *D, const ParsedAttr &AL);
   void handleCmseNSEntryAttr(Decl *D, const ParsedAttr &AL);

diff --git a/clang/include/clang/Sema/SemaAVR.h b/clang/include/clang/Sema/SemaAVR.h
@@ -13,10 +13,10 @@
 #ifndef LLVM_CLANG_SEMA_SEMAAVR_H
 #define LLVM_CLANG_SEMA_SEMAAVR_H
 
+#include "clang/AST/ASTFwd.h"
 #include "clang/Sema/SemaBase.h"
 
 namespace clang {
-class Decl;
 class ParsedAttr;
 
 class SemaAVR : public SemaBase {

diff --git a/clang/include/clang/Sema/SemaBPF.h b/clang/include/clang/Sema/SemaBPF.h
@@ -13,9 +13,7 @@
 #ifndef LLVM_CLANG_SEMA_SEMABPF_H
 #define LLVM_CLANG_SEMA_SEMABPF_H
 
-#include "clang/AST/Decl.h"
-#include "clang/AST/DeclBase.h"
-#include "clang/AST/Expr.h"
+#include "clang/AST/ASTFwd.h"
 #include "clang/Sema/SemaBase.h"
 
 namespace clang {

diff --git a/clang/include/clang/Sema/SemaCUDA.h b/clang/include/clang/Sema/SemaCUDA.h
@@ -13,24 +13,34 @@
 #ifndef LLVM_CLANG_SEMA_SEMACUDA_H
 #define LLVM_CLANG_SEMA_SEMACUDA_H
 
-#include "clang/AST/Decl.h"
-#include "clang/AST/DeclCXX.h"
+#include "clang/AST/ASTFwd.h"
+#include "clang/AST/DeclAccessPair.h"
 #include "clang/AST/Redeclarable.h"
 #include "clang/Basic/Cuda.h"
+#include "clang/Basic/LLVM.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Sema/Lookup.h"
 #include "clang/Sema/Ownership.h"
-#include "clang/Sema/ParsedAttr.h"
-#include "clang/Sema/Scope.h"
-#include "clang/Sema/ScopeInfo.h"
 #include "clang/Sema/SemaBase.h"
 #include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/DenseMapInfo.h"
+#include "llvm/ADT/DenseSet.h"
+#include "llvm/ADT/Hashing.h"
 #include "llvm/ADT/SmallVector.h"
 #include <string>
+#include <utility>
 
 namespace clang {
+namespace sema {
+class Capture;
+} // namespace sema
 
+class ASTReader;
+class ASTWriter;
 enum class CUDAFunctionTarget;
+enum class CXXSpecialMemberKind;
+class ParsedAttributesView;
+class Scope;
 
 class SemaCUDA : public SemaBase {
 public:

diff --git a/clang/include/clang/Sema/SemaCodeCompletion.h b/clang/include/clang/Sema/SemaCodeCompletion.h
@@ -13,26 +13,26 @@
 #ifndef LLVM_CLANG_SEMA_SEMACODECOMPLETION_H
 #define LLVM_CLANG_SEMA_SEMACODECOMPLETION_H
 
-#include "clang/AST/Decl.h"
-#include "clang/AST/DeclCXX.h"
-#include "clang/AST/Expr.h"
+#include "clang/AST/ASTFwd.h"
 #include "clang/AST/Type.h"
 #include "clang/Basic/AttributeCommonInfo.h"
 #include "clang/Basic/IdentifierTable.h"
 #include "clang/Basic/LLVM.h"
 #include "clang/Basic/SourceLocation.h"
-#include "clang/Lex/MacroInfo.h"
 #include "clang/Lex/ModuleLoader.h"
 #include "clang/Sema/CodeCompleteConsumer.h"
 #include "clang/Sema/DeclSpec.h"
 #include "clang/Sema/Designator.h"
 #include "clang/Sema/Ownership.h"
-#include "clang/Sema/Scope.h"
 #include "clang/Sema/SemaBase.h"
 #include "llvm/ADT/StringRef.h"
 #include <optional>
 
 namespace clang {
+class DeclGroupRef;
+class MacroInfo;
+class Scope;
+class TemplateName;
 
 class SemaCodeCompletion : public SemaBase {
 public:

diff --git a/clang/include/clang/Sema/SemaHLSL.h b/clang/include/clang/Sema/SemaHLSL.h
@@ -13,19 +13,18 @@
 #ifndef LLVM_CLANG_SEMA_SEMAHLSL_H
 #define LLVM_CLANG_SEMA_SEMAHLSL_H
 
+#include "clang/AST/ASTFwd.h"
 #include "clang/AST/Attr.h"
-#include "clang/AST/Decl.h"
-#include "clang/AST/DeclBase.h"
-#include "clang/AST/Expr.h"
-#include "clang/Basic/AttributeCommonInfo.h"
-#include "clang/Basic/IdentifierTable.h"
 #include "clang/Basic/SourceLocation.h"
-#include "clang/Sema/Scope.h"
 #include "clang/Sema/SemaBase.h"
+#include "llvm/TargetParser/Triple.h"
 #include <initializer_list>
 
 namespace clang {
+class AttributeCommonInfo;
+class IdentifierInfo;
 class ParsedAttr;
+class Scope;
 
 class SemaHLSL : public SemaBase {
 public:
@@ -56,6 +55,7 @@ class SemaHLSL : public SemaBase {
   void handleSV_DispatchThreadIDAttr(Decl *D, const ParsedAttr &AL);
   void handlePackOffsetAttr(Decl *D, const ParsedAttr &AL);
   void handleShaderAttr(Decl *D, const ParsedAttr &AL);
+  void handleROVAttr(Decl *D, const ParsedAttr &AL);
   void handleResourceClassAttr(Decl *D, const ParsedAttr &AL);
   void handleResourceBindingAttr(Decl *D, const ParsedAttr &AL);
   void handleParamModifierAttr(Decl *D, const ParsedAttr &AL);

diff --git a/clang/include/clang/Sema/SemaHexagon.h b/clang/include/clang/Sema/SemaHexagon.h
@@ -13,7 +13,7 @@
 #ifndef LLVM_CLANG_SEMA_SEMAHEXAGON_H
 #define LLVM_CLANG_SEMA_SEMAHEXAGON_H
 
-#include "clang/AST/Expr.h"
+#include "clang/AST/ASTFwd.h"
 #include "clang/Sema/SemaBase.h"
 
 namespace clang {

diff --git a/clang/include/clang/Sema/SemaLoongArch.h b/clang/include/clang/Sema/SemaLoongArch.h
@@ -13,11 +13,12 @@
 #ifndef LLVM_CLANG_SEMA_SEMALOONGARCH_H
 #define LLVM_CLANG_SEMA_SEMALOONGARCH_H
 
-#include "clang/AST/Expr.h"
-#include "clang/Basic/TargetInfo.h"
+#include "clang/AST/ASTFwd.h"
 #include "clang/Sema/SemaBase.h"
 
 namespace clang {
+class TargetInfo;
+
 class SemaLoongArch : public SemaBase {
 public:
   SemaLoongArch(Sema &S);

diff --git a/clang/include/clang/Sema/SemaM68k.h b/clang/include/clang/Sema/SemaM68k.h
@@ -13,10 +13,10 @@
 #ifndef LLVM_CLANG_SEMA_SEMAM68K_H
 #define LLVM_CLANG_SEMA_SEMAM68K_H
 
+#include "clang/AST/ASTFwd.h"
 #include "clang/Sema/SemaBase.h"
 
 namespace clang {
-class Decl;
 class ParsedAttr;
 
 class SemaM68k : public SemaBase {

diff --git a/clang/include/clang/Sema/SemaMIPS.h b/clang/include/clang/Sema/SemaMIPS.h
@@ -13,13 +13,12 @@
 #ifndef LLVM_CLANG_SEMA_SEMAMIPS_H
 #define LLVM_CLANG_SEMA_SEMAMIPS_H
 
-#include "clang/AST/DeclBase.h"
-#include "clang/AST/Expr.h"
-#include "clang/Basic/TargetInfo.h"
+#include "clang/AST/ASTFwd.h"
 #include "clang/Sema/SemaBase.h"
 
 namespace clang {
 class ParsedAttr;
+class TargetInfo;
 
 class SemaMIPS : public SemaBase {
 public:

diff --git a/clang/include/clang/Sema/SemaMSP430.h b/clang/include/clang/Sema/SemaMSP430.h
@@ -13,10 +13,10 @@
 #ifndef LLVM_CLANG_SEMA_SEMAMSP430_H
 #define LLVM_CLANG_SEMA_SEMAMSP430_H
 
+#include "clang/AST/ASTFwd.h"
 #include "clang/Sema/SemaBase.h"
 
 namespace clang {
-class Decl;
 class ParsedAttr;
 
 class SemaMSP430 : public SemaBase {

diff --git a/clang/include/clang/Sema/SemaNVPTX.h b/clang/include/clang/Sema/SemaNVPTX.h
@@ -13,11 +13,12 @@
 #ifndef LLVM_CLANG_SEMA_SEMANVPTX_H
 #define LLVM_CLANG_SEMA_SEMANVPTX_H
 
-#include "clang/AST/Expr.h"
-#include "clang/Basic/TargetInfo.h"
+#include "clang/AST/ASTFwd.h"
 #include "clang/Sema/SemaBase.h"
 
 namespace clang {
+class TargetInfo;
+
 class SemaNVPTX : public SemaBase {
 public:
   SemaNVPTX(Sema &S);

diff --git a/clang/include/clang/Sema/SemaObjC.h b/clang/include/clang/Sema/SemaObjC.h
@@ -13,11 +13,8 @@
 #ifndef LLVM_CLANG_SEMA_SEMAOBJC_H
 #define LLVM_CLANG_SEMA_SEMAOBJC_H
 
-#include "clang/AST/Decl.h"
-#include "clang/AST/DeclBase.h"
+#include "clang/AST/ASTFwd.h"
 #include "clang/AST/DeclObjC.h"
-#include "clang/AST/Expr.h"
-#include "clang/AST/ExprObjC.h"
 #include "clang/AST/NSAPI.h"
 #include "clang/AST/OperationKinds.h"
 #include "clang/AST/Type.h"
@@ -27,24 +24,29 @@
 #include "clang/Basic/Specifiers.h"
 #include "clang/Basic/TokenKinds.h"
 #include "clang/Sema/DeclSpec.h"
-#include "clang/Sema/Lookup.h"
 #include "clang/Sema/ObjCMethodList.h"
 #include "clang/Sema/Ownership.h"
 #include "clang/Sema/Redeclaration.h"
-#include "clang/Sema/Scope.h"
+#include "clang/Sema/Sema.h"
 #include "clang/Sema/SemaBase.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/MapVector.h"
 #include "llvm/ADT/SmallPtrSet.h"
 #include <memory>
 #include <optional>
-#include <type_traits>
 #include <utility>
 
 namespace clang {
 
+class AttributeCommonInfo;
+class AvailabilitySpec;
 enum class CheckedConversionKind;
+class DeclGroupRef;
+class LookupResult;
+struct ObjCDictionaryElement;
 class ParsedAttr;
+class ParsedAttributesView;
+class Scope;
 struct SkipBodyInfo;
 
 class SemaObjC : public SemaBase {

diff --git a/clang/include/clang/Sema/SemaOpenACC.h b/clang/include/clang/Sema/SemaOpenACC.h
@@ -16,13 +16,19 @@
 
 #include "clang/AST/DeclGroup.h"
 #include "clang/AST/StmtOpenACC.h"
+#include "clang/Basic/LLVM.h"
 #include "clang/Basic/OpenACCKinds.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Sema/Ownership.h"
 #include "clang/Sema/SemaBase.h"
+#include "llvm/ADT/SmallVector.h"
+#include <cassert>
+#include <optional>
+#include <utility>
 #include <variant>
 
 namespace clang {
+class IdentifierInfo;
 class OpenACCClause;
 
 class SemaOpenACC : public SemaBase {

diff --git a/clang/include/clang/Sema/SemaOpenCL.h b/clang/include/clang/Sema/SemaOpenCL.h
@@ -13,10 +13,10 @@
 #ifndef LLVM_CLANG_SEMA_SEMAOPENCL_H
 #define LLVM_CLANG_SEMA_SEMAOPENCL_H
 
+#include "clang/AST/ASTFwd.h"
 #include "clang/Sema/SemaBase.h"
 
 namespace clang {
-class Decl;
 class ParsedAttr;
 
 class SemaOpenCL : public SemaBase {

diff --git a/clang/include/clang/Sema/SemaOpenMP.h b/clang/include/clang/Sema/SemaOpenMP.h
@@ -14,35 +14,36 @@
 #ifndef LLVM_CLANG_SEMA_SEMAOPENMP_H
 #define LLVM_CLANG_SEMA_SEMAOPENMP_H
 
+#include "clang/AST/ASTFwd.h"
 #include "clang/AST/Attr.h"
-#include "clang/AST/Decl.h"
-#include "clang/AST/DeclBase.h"
-#include "clang/AST/DeclOpenMP.h"
 #include "clang/AST/DeclarationName.h"
-#include "clang/AST/Expr.h"
 #include "clang/AST/ExprOpenMP.h"
 #include "clang/AST/OpenMPClause.h"
-#include "clang/AST/Stmt.h"
 #include "clang/AST/StmtOpenMP.h"
-#include "clang/AST/Type.h"
 #include "clang/Basic/IdentifierTable.h"
 #include "clang/Basic/LLVM.h"
 #include "clang/Basic/OpenMPKinds.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Basic/Specifiers.h"
 #include "clang/Sema/DeclSpec.h"
 #include "clang/Sema/Ownership.h"
-#include "clang/Sema/Scope.h"
-#include "clang/Sema/ScopeInfo.h"
 #include "clang/Sema/SemaBase.h"
 #include "llvm/ADT/DenseMap.h"
-#include "llvm/ADT/PointerUnion.h"
+#include "llvm/Frontend/OpenMP/OMP.h.inc"
+#include "llvm/Frontend/OpenMP/OMPConstants.h"
 #include <optional>
 #include <string>
 #include <utility>
 
 namespace clang {
+namespace sema {
+class FunctionScopeInfo;
+} // namespace sema
+
+class DeclContext;
+class DeclGroupRef;
 class ParsedAttr;
+class Scope;
 
 class SemaOpenMP : public SemaBase {
 public:

diff --git a/clang/include/clang/Sema/SemaPPC.h b/clang/include/clang/Sema/SemaPPC.h
@@ -13,13 +13,14 @@
 #ifndef LLVM_CLANG_SEMA_SEMAPPC_H
 #define LLVM_CLANG_SEMA_SEMAPPC_H
 
-#include "clang/AST/Expr.h"
+#include "clang/AST/ASTFwd.h"
 #include "clang/AST/Type.h"
 #include "clang/Basic/SourceLocation.h"
-#include "clang/Basic/TargetInfo.h"
 #include "clang/Sema/SemaBase.h"
 
 namespace clang {
+class TargetInfo;
+
 class SemaPPC : public SemaBase {
 public:
   SemaPPC(Sema &S);

diff --git a/clang/include/clang/Sema/SemaPseudoObject.h b/clang/include/clang/Sema/SemaPseudoObject.h
@@ -14,14 +14,14 @@
 #ifndef LLVM_CLANG_SEMA_SEMAPSEUDOOBJECT_H
 #define LLVM_CLANG_SEMA_SEMAPSEUDOOBJECT_H
 
-#include "clang/AST/Expr.h"
+#include "clang/AST/ASTFwd.h"
 #include "clang/AST/OperationKinds.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Sema/Ownership.h"
-#include "clang/Sema/Scope.h"
 #include "clang/Sema/SemaBase.h"
 
 namespace clang {
+class Scope;
 
 class SemaPseudoObject : public SemaBase {
 public:

diff --git a/clang/include/clang/Sema/SemaRISCV.h b/clang/include/clang/Sema/SemaRISCV.h
@@ -13,18 +13,21 @@
 #ifndef LLVM_CLANG_SEMA_SEMARISCV_H
 #define LLVM_CLANG_SEMA_SEMARISCV_H
 
-#include "clang/AST/DeclBase.h"
-#include "clang/AST/Expr.h"
+#include "clang/AST/ASTFwd.h"
 #include "clang/AST/Type.h"
 #include "clang/Basic/SourceLocation.h"
-#include "clang/Basic/TargetInfo.h"
-#include "clang/Sema/RISCVIntrinsicManager.h"
 #include "clang/Sema/SemaBase.h"
 #include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringRef.h"
 #include <memory>
 
 namespace clang {
+namespace sema {
+class RISCVIntrinsicManager;
+} // namespace sema
+
 class ParsedAttr;
+class TargetInfo;
 
 class SemaRISCV : public SemaBase {
 public:
@@ -39,7 +42,7 @@ class SemaRISCV : public SemaBase {
   bool isValidRVVBitcast(QualType srcType, QualType destType);
 
   void handleInterruptAttr(Decl *D, const ParsedAttr &AL);
-  bool isAliasValid(unsigned BuiltinID, StringRef AliasName);
+  bool isAliasValid(unsigned BuiltinID, llvm::StringRef AliasName);
 
   /// Indicate RISC-V vector builtin functions enabled or not.
   bool DeclareRVVBuiltins = false;

diff --git a/clang/include/clang/Sema/SemaSYCL.h b/clang/include/clang/Sema/SemaSYCL.h
@@ -13,7 +13,7 @@
 #ifndef LLVM_CLANG_SEMA_SEMASYCL_H
 #define LLVM_CLANG_SEMA_SEMASYCL_H
 
-#include "clang/AST/Decl.h"
+#include "clang/AST/ASTFwd.h"
 #include "clang/AST/Type.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Sema/Ownership.h"

diff --git a/clang/include/clang/Sema/SemaSwift.h b/clang/include/clang/Sema/SemaSwift.h
@@ -13,15 +13,15 @@
 #ifndef LLVM_CLANG_SEMA_SEMASWIFT_H
 #define LLVM_CLANG_SEMA_SEMASWIFT_H
 
-#include "clang/AST/Attr.h"
+#include "clang/AST/ASTFwd.h"
 #include "clang/Basic/LLVM.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Sema/SemaBase.h"
-#include "llvm/ADT/StringRef.h"
 
 namespace clang {
 class AttributeCommonInfo;
 class Decl;
+enum class ParameterABI;
 class ParsedAttr;
 class SwiftNameAttr;
 

diff --git a/clang/include/clang/Sema/SemaSystemZ.h b/clang/include/clang/Sema/SemaSystemZ.h
@@ -13,7 +13,7 @@
 #ifndef LLVM_CLANG_SEMA_SEMASYSTEMZ_H
 #define LLVM_CLANG_SEMA_SEMASYSTEMZ_H
 
-#include "clang/AST/Expr.h"
+#include "clang/AST/ASTFwd.h"
 #include "clang/Sema/SemaBase.h"
 
 namespace clang {

diff --git a/clang/include/clang/Sema/SemaWasm.h b/clang/include/clang/Sema/SemaWasm.h
@@ -13,14 +13,13 @@
 #ifndef LLVM_CLANG_SEMA_SEMAWASM_H
 #define LLVM_CLANG_SEMA_SEMAWASM_H
 
-#include "clang/AST/Attr.h"
-#include "clang/AST/DeclBase.h"
-#include "clang/AST/Expr.h"
-#include "clang/Basic/TargetInfo.h"
-#include "clang/Sema/ParsedAttr.h"
+#include "clang/AST/ASTFwd.h"
 #include "clang/Sema/SemaBase.h"
 
 namespace clang {
+class ParsedAttr;
+class TargetInfo;
+
 class SemaWasm : public SemaBase {
 public:
   SemaWasm(Sema &S);

diff --git a/clang/include/clang/Sema/SemaX86.h b/clang/include/clang/Sema/SemaX86.h
@@ -13,14 +13,13 @@
 #ifndef LLVM_CLANG_SEMA_SEMAX86_H
 #define LLVM_CLANG_SEMA_SEMAX86_H
 
-#include "clang/AST/DeclBase.h"
-#include "clang/AST/Expr.h"
+#include "clang/AST/ASTFwd.h"
 #include "clang/Basic/LLVM.h"
-#include "clang/Basic/TargetInfo.h"
 #include "clang/Sema/SemaBase.h"
 
 namespace clang {
 class ParsedAttr;
+class TargetInfo;
 
 class SemaX86 : public SemaBase {
 public:

diff --git a/clang/include/clang/Serialization/ASTReader.h b/clang/include/clang/Serialization/ASTReader.h
@@ -648,6 +648,12 @@ class ASTReader
   /// performed deduplication.
   llvm::SetVector<NamedDecl *> PendingMergedDefinitionsToDeduplicate;
 
+  /// The duplicated definitions in module units which are pending to be warned.
+  /// We need to delay it to wait for the loading of definitions since we don't
+  /// want to warn for forward declarations.
+  llvm::SmallVector<std::pair<Decl *, Decl *>>
+      PendingWarningForDuplicatedDefsInModuleUnits;
+
   /// Read the record that describes the lexical contents of a DC.
   bool ReadLexicalDeclContextStorage(ModuleFile &M,
                                      llvm::BitstreamCursor &Cursor,

diff --git a/clang/include/clang/StaticAnalyzer/Checkers/Checkers.td b/clang/include/clang/StaticAnalyzer/Checkers/Checkers.td
@@ -1039,10 +1039,6 @@ def ArrayBoundCheckerV2 : Checker<"ArrayBoundV2">,
   HelpText<"Warn about buffer overflows (newer checker)">,
   Documentation<HasDocumentation>;
 
-def MallocOverflowSecurityChecker : Checker<"MallocOverflow">,
-  HelpText<"Check for overflows in the arguments to malloc()">,
-  Documentation<HasDocumentation>;
-
 def MmapWriteExecChecker : Checker<"MmapWriteExec">,
   HelpText<"Warn on mmap() calls that are both writable and executable">,
   Documentation<HasDocumentation>;

diff --git a/clang/include/clang/StaticAnalyzer/Core/AnalyzerOptions.def b/clang/include/clang/StaticAnalyzer/Core/AnalyzerOptions.def
@@ -407,6 +407,11 @@ ANALYZER_OPTION(
 ANALYZER_OPTION(unsigned, MaxSymbolComplexity, "max-symbol-complexity",
                 "The maximum complexity of symbolic constraint.", 35)
 
+// HACK:https://discourse.llvm.org/t/rfc-make-istainted-and-complex-symbols-friends/79570
+// Ideally, we should get rid of this option soon.
+ANALYZER_OPTION(unsigned, MaxTaintedSymbolComplexity, "max-tainted-symbol-complexity",
+                "[DEPRECATED] The maximum complexity of a symbol to carry taint", 9)
+
 ANALYZER_OPTION(unsigned, MaxTimesInlineLarge, "max-times-inline-large",
                 "The maximum times a large function could be inlined.", 32)
 

diff --git a/clang/lib/APINotes/APINotesFormat.h b/clang/lib/APINotes/APINotesFormat.h
@@ -24,7 +24,7 @@ const uint16_t VERSION_MAJOR = 0;
 /// API notes file minor version number.
 ///
 /// When the format changes IN ANY WAY, this number should be incremented.
-const uint16_t VERSION_MINOR = 29; // SwiftConformsTo
+const uint16_t VERSION_MINOR = 30; // fields
 
 const uint8_t kSwiftCopyable = 1;
 const uint8_t kSwiftNonCopyable = 2;
@@ -72,6 +72,10 @@ enum BlockID {
   /// used in other tables.
   OBJC_SELECTOR_BLOCK_ID,
 
+  /// The fields data block, which maps names fields of C records to
+  /// information about the field.
+  FIELD_BLOCK_ID,
+
   /// The global variables data block, which maps global variable names to
   /// information about the global variable.
   GLOBAL_VARIABLE_BLOCK_ID,
@@ -199,6 +203,20 @@ using CXXMethodDataLayout =
                          >;
 } // namespace cxx_method_block
 
+namespace field_block {
+enum {
+  FIELD_DATA = 1,
+};
+
+using FieldDataLayout =
+    llvm::BCRecordLayout<FIELD_DATA,      // record ID
+                         llvm::BCVBR<16>, // table offset within the blob (see
+                                          // below)
+                         llvm::BCBlob     // map from C (context id, name)
+                                          // tuples to C field information
+                         >;
+} // namespace field_block
+
 namespace objc_selector_block {
 enum {
   OBJC_SELECTOR_DATA = 1,

diff --git a/clang/lib/APINotes/APINotesReader.cpp b/clang/lib/APINotes/APINotesReader.cpp
@@ -299,6 +299,28 @@ class ObjCPropertyTableInfo
   }
 };
 
+/// Used to deserialize the on-disk C record field table.
+class FieldTableInfo
+    : public VersionedTableInfo<FieldTableInfo, SingleDeclTableKey, FieldInfo> {
+public:
+  static internal_key_type ReadKey(const uint8_t *Data, unsigned Length) {
+    auto CtxID = endian::readNext<uint32_t, llvm::endianness::little>(Data);
+    auto NameID = endian::readNext<uint32_t, llvm::endianness::little>(Data);
+    return {CtxID, NameID};
+  }
+
+  hash_value_type ComputeHash(internal_key_type Key) {
+    return static_cast<size_t>(Key.hashValue());
+  }
+
+  static FieldInfo readUnversioned(internal_key_type Key,
+                                   const uint8_t *&Data) {
+    FieldInfo Info;
+    ReadVariableInfo(Data, Info);
+    return Info;
+  }
+};
+
 /// Read serialized ParamInfo.
 void ReadParamInfo(const uint8_t *&Data, ParamInfo &Info) {
   ReadVariableInfo(Data, Info);
@@ -653,6 +675,12 @@ class APINotesReader::Implementation {
   /// The Objective-C property table.
   std::unique_ptr<SerializedObjCPropertyTable> ObjCPropertyTable;
 
+  using SerializedFieldTable =
+      llvm::OnDiskIterableChainedHashTable<FieldTableInfo>;
+
+  /// The C record field table.
+  std::unique_ptr<SerializedFieldTable> FieldTable;
+
   using SerializedObjCMethodTable =
       llvm::OnDiskIterableChainedHashTable<ObjCMethodTableInfo>;
 
@@ -720,6 +748,8 @@ class APINotesReader::Implementation {
                            llvm::SmallVectorImpl<uint64_t> &Scratch);
   bool readCXXMethodBlock(llvm::BitstreamCursor &Cursor,
                           llvm::SmallVectorImpl<uint64_t> &Scratch);
+  bool readFieldBlock(llvm::BitstreamCursor &Cursor,
+                      llvm::SmallVectorImpl<uint64_t> &Scratch);
   bool readObjCSelectorBlock(llvm::BitstreamCursor &Cursor,
                              llvm::SmallVectorImpl<uint64_t> &Scratch);
   bool readGlobalVariableBlock(llvm::BitstreamCursor &Cursor,
@@ -1252,6 +1282,81 @@ bool APINotesReader::Implementation::readCXXMethodBlock(
   return false;
 }
 
+bool APINotesReader::Implementation::readFieldBlock(
+    llvm::BitstreamCursor &Cursor, llvm::SmallVectorImpl<uint64_t> &Scratch) {
+  if (Cursor.EnterSubBlock(FIELD_BLOCK_ID))
+    return true;
+
+  llvm::Expected<llvm::BitstreamEntry> MaybeNext = Cursor.advance();
+  if (!MaybeNext) {
+    // FIXME this drops the error on the floor.
+    consumeError(MaybeNext.takeError());
+    return false;
+  }
+  llvm::BitstreamEntry Next = MaybeNext.get();
+  while (Next.Kind != llvm::BitstreamEntry::EndBlock) {
+    if (Next.Kind == llvm::BitstreamEntry::Error)
+      return true;
+
+    if (Next.Kind == llvm::BitstreamEntry::SubBlock) {
+      // Unknown sub-block, possibly for use by a future version of the
+      // API notes format.
+      if (Cursor.SkipBlock())
+        return true;
+
+      MaybeNext = Cursor.advance();
+      if (!MaybeNext) {
+        // FIXME this drops the error on the floor.
+        consumeError(MaybeNext.takeError());
+        return false;
+      }
+      Next = MaybeNext.get();
+      continue;
+    }
+
+    Scratch.clear();
+    llvm::StringRef BlobData;
+    llvm::Expected<unsigned> MaybeKind =
+        Cursor.readRecord(Next.ID, Scratch, &BlobData);
+    if (!MaybeKind) {
+      // FIXME this drops the error on the floor.
+      consumeError(MaybeKind.takeError());
+      return false;
+    }
+    unsigned Kind = MaybeKind.get();
+    switch (Kind) {
+    case field_block::FIELD_DATA: {
+      // Already saw field table.
+      if (FieldTable)
+        return true;
+
+      uint32_t tableOffset;
+      field_block::FieldDataLayout::readRecord(Scratch, tableOffset);
+      auto base = reinterpret_cast<const uint8_t *>(BlobData.data());
+
+      FieldTable.reset(SerializedFieldTable::Create(
+          base + tableOffset, base + sizeof(uint32_t), base));
+      break;
+    }
+
+    default:
+      // Unknown record, possibly for use by a future version of the
+      // module format.
+      break;
+    }
+
+    MaybeNext = Cursor.advance();
+    if (!MaybeNext) {
+      // FIXME this drops the error on the floor.
+      consumeError(MaybeNext.takeError());
+      return false;
+    }
+    Next = MaybeNext.get();
+  }
+
+  return false;
+}
+
 bool APINotesReader::Implementation::readObjCSelectorBlock(
     llvm::BitstreamCursor &Cursor, llvm::SmallVectorImpl<uint64_t> &Scratch) {
   if (Cursor.EnterSubBlock(OBJC_SELECTOR_BLOCK_ID))
@@ -1812,6 +1917,14 @@ APINotesReader::APINotesReader(llvm::MemoryBuffer *InputBuffer,
       }
       break;
 
+    case FIELD_BLOCK_ID:
+      if (!HasValidControlBlock ||
+          Implementation->readFieldBlock(Cursor, Scratch)) {
+        Failed = true;
+        return;
+      }
+      break;
+
     case OBJC_SELECTOR_BLOCK_ID:
       if (!HasValidControlBlock ||
           Implementation->readObjCSelectorBlock(Cursor, Scratch)) {
@@ -2031,6 +2144,23 @@ auto APINotesReader::lookupObjCMethod(ContextID CtxID, ObjCSelectorRef Selector,
   return {Implementation->SwiftVersion, *Known};
 }
 
+auto APINotesReader::lookupField(ContextID CtxID, llvm::StringRef Name)
+    -> VersionedInfo<FieldInfo> {
+  if (!Implementation->FieldTable)
+    return std::nullopt;
+
+  std::optional<IdentifierID> NameID = Implementation->getIdentifier(Name);
+  if (!NameID)
+    return std::nullopt;
+
+  auto Known = Implementation->FieldTable->find(
+      SingleDeclTableKey(CtxID.Value, *NameID));
+  if (Known == Implementation->FieldTable->end())
+    return std::nullopt;
+
+  return {Implementation->SwiftVersion, *Known};
+}
+
 auto APINotesReader::lookupCXXMethod(ContextID CtxID, llvm::StringRef Name)
     -> VersionedInfo<CXXMethodInfo> {
   if (!Implementation->CXXMethodTable)

diff --git a/clang/lib/APINotes/APINotesWriter.cpp b/clang/lib/APINotes/APINotesWriter.cpp
@@ -62,6 +62,13 @@ class APINotesWriter::Implementation {
       llvm::SmallVector<std::pair<VersionTuple, ObjCPropertyInfo>, 1>>
       ObjCProperties;
 
+  /// Information about C record fields.
+  ///
+  /// Indexed by the context ID and name ID.
+  llvm::DenseMap<SingleDeclTableKey,
+                 llvm::SmallVector<std::pair<VersionTuple, FieldInfo>, 1>>
+      Fields;
+
   /// Information about Objective-C methods.
   ///
   /// Indexed by the context ID, selector ID, and Boolean (stored as a char)
@@ -158,6 +165,7 @@ class APINotesWriter::Implementation {
   void writeObjCPropertyBlock(llvm::BitstreamWriter &Stream);
   void writeObjCMethodBlock(llvm::BitstreamWriter &Stream);
   void writeCXXMethodBlock(llvm::BitstreamWriter &Stream);
+  void writeFieldBlock(llvm::BitstreamWriter &Stream);
   void writeObjCSelectorBlock(llvm::BitstreamWriter &Stream);
   void writeGlobalVariableBlock(llvm::BitstreamWriter &Stream);
   void writeGlobalFunctionBlock(llvm::BitstreamWriter &Stream);
@@ -190,6 +198,7 @@ void APINotesWriter::Implementation::writeToStream(llvm::raw_ostream &OS) {
     writeObjCPropertyBlock(Stream);
     writeObjCMethodBlock(Stream);
     writeCXXMethodBlock(Stream);
+    writeFieldBlock(Stream);
     writeObjCSelectorBlock(Stream);
     writeGlobalVariableBlock(Stream);
     writeGlobalFunctionBlock(Stream);
@@ -858,6 +867,62 @@ void APINotesWriter::Implementation::writeCXXMethodBlock(
   }
 }
 
+namespace {
+/// Used to serialize the on-disk C field table.
+class FieldTableInfo
+    : public VersionedTableInfo<FieldTableInfo, SingleDeclTableKey, FieldInfo> {
+public:
+  unsigned getKeyLength(key_type_ref) {
+    return sizeof(uint32_t) + sizeof(uint32_t);
+  }
+
+  void EmitKey(raw_ostream &OS, key_type_ref Key, unsigned) {
+    llvm::support::endian::Writer writer(OS, llvm::endianness::little);
+    writer.write<uint32_t>(Key.parentContextID);
+    writer.write<uint32_t>(Key.nameID);
+  }
+
+  hash_value_type ComputeHash(key_type_ref key) {
+    return static_cast<size_t>(key.hashValue());
+  }
+
+  unsigned getUnversionedInfoSize(const FieldInfo &FI) {
+    return getVariableInfoSize(FI);
+  }
+
+  void emitUnversionedInfo(raw_ostream &OS, const FieldInfo &FI) {
+    emitVariableInfo(OS, FI);
+  }
+};
+} // namespace
+
+void APINotesWriter::Implementation::writeFieldBlock(
+    llvm::BitstreamWriter &Stream) {
+  llvm::BCBlockRAII Scope(Stream, FIELD_BLOCK_ID, 3);
+
+  if (Fields.empty())
+    return;
+
+  {
+    llvm::SmallString<4096> HashTableBlob;
+    uint32_t Offset;
+    {
+      llvm::OnDiskChainedHashTableGenerator<FieldTableInfo> Generator;
+      for (auto &FD : Fields)
+        Generator.insert(FD.first, FD.second);
+
+      llvm::raw_svector_ostream BlobStream(HashTableBlob);
+      // Make sure that no bucket is at offset 0
+      llvm::support::endian::write<uint32_t>(BlobStream, 0,
+                                             llvm::endianness::little);
+      Offset = Generator.Emit(BlobStream);
+    }
+
+    field_block::FieldDataLayout FieldData(Stream);
+    FieldData.emit(Scratch, Offset, HashTableBlob);
+  }
+}
+
 namespace {
 /// Used to serialize the on-disk Objective-C selector table.
 class ObjCSelectorTableInfo {
@@ -1423,6 +1488,14 @@ void APINotesWriter::addCXXMethod(ContextID CtxID, llvm::StringRef Name,
   Implementation->CXXMethods[Key].push_back({SwiftVersion, Info});
 }
 
+void APINotesWriter::addField(ContextID CtxID, llvm::StringRef Name,
+                              const FieldInfo &Info,
+                              VersionTuple SwiftVersion) {
+  IdentifierID NameID = Implementation->getIdentifier(Name);
+  SingleDeclTableKey Key(CtxID.Value, NameID);
+  Implementation->Fields[Key].push_back({SwiftVersion, Info});
+}
+
 void APINotesWriter::addGlobalVariable(std::optional<Context> Ctx,
                                        llvm::StringRef Name,
                                        const GlobalVariableInfo &Info,