diff --git a/include/spirv-tools/libspirv.h b/include/spirv-tools/libspirv.h
index 16ea7ff..a0114c3 100644
--- a/include/spirv-tools/libspirv.h
+++ b/include/spirv-tools/libspirv.h
@@ -176,12 +176,13 @@
 
   // Set 5:  Operands that are a single word bitmask.
   // Sometimes a set bit indicates the instruction requires still more operands.
-  SPV_OPERAND_TYPE_IMAGE,              // SPIR-V Sec 3.14
-  SPV_OPERAND_TYPE_FP_FAST_MATH_MODE,  // SPIR-V Sec 3.15
-  SPV_OPERAND_TYPE_SELECTION_CONTROL,  // SPIR-V Sec 3.22
-  SPV_OPERAND_TYPE_LOOP_CONTROL,       // SPIR-V Sec 3.23
-  SPV_OPERAND_TYPE_FUNCTION_CONTROL,   // SPIR-V Sec 3.24
-  SPV_OPERAND_TYPE_MEMORY_ACCESS,      // SPIR-V Sec 3.26
+  SPV_OPERAND_TYPE_IMAGE,                  // SPIR-V Sec 3.14
+  SPV_OPERAND_TYPE_FP_FAST_MATH_MODE,      // SPIR-V Sec 3.15
+  SPV_OPERAND_TYPE_SELECTION_CONTROL,      // SPIR-V Sec 3.22
+  SPV_OPERAND_TYPE_LOOP_CONTROL,           // SPIR-V Sec 3.23
+  SPV_OPERAND_TYPE_FUNCTION_CONTROL,       // SPIR-V Sec 3.24
+  SPV_OPERAND_TYPE_MEMORY_ACCESS,          // SPIR-V Sec 3.26
+  SPV_OPERAND_TYPE_FRAGMENT_SHADING_RATE,  // SPIR-V Sec 3.FSR
 
 // The remaining operand types are only used internally by the assembler.
 // There are two categories:
diff --git a/source/operand.cpp b/source/operand.cpp
index 7b2b98f..d4b64a8 100644
--- a/source/operand.cpp
+++ b/source/operand.cpp
@@ -208,6 +208,8 @@
     case SPV_OPERAND_TYPE_MEMORY_ACCESS:
     case SPV_OPERAND_TYPE_OPTIONAL_MEMORY_ACCESS:
       return "memory access";
+    case SPV_OPERAND_TYPE_FRAGMENT_SHADING_RATE:
+      return "shading rate";
     case SPV_OPERAND_TYPE_SCOPE_ID:
       return "scope ID";
     case SPV_OPERAND_TYPE_GROUP_OPERATION:
@@ -360,6 +362,7 @@
     case SPV_OPERAND_TYPE_LOOP_CONTROL:
     case SPV_OPERAND_TYPE_FUNCTION_CONTROL:
     case SPV_OPERAND_TYPE_MEMORY_ACCESS:
+    case SPV_OPERAND_TYPE_FRAGMENT_SHADING_RATE:
     case SPV_OPERAND_TYPE_DEBUG_INFO_FLAGS:
     case SPV_OPERAND_TYPE_CLDEBUG100_DEBUG_INFO_FLAGS:
       return true;
diff --git a/source/val/validate_builtins.cpp b/source/val/validate_builtins.cpp
index 1d7017d..5b9eed6 100644
--- a/source/val/validate_builtins.cpp
+++ b/source/val/validate_builtins.cpp
@@ -1,4 +1,6 @@
 // Copyright (c) 2018 Google LLC.
+// Modifications Copyright (C) 2020 Advanced Micro Devices, Inc. All rights
+// reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -230,6 +232,12 @@
   spv_result_t ValidateComputeI32InputAtDefinition(const Decoration& decoration,
                                                    const Instruction& inst);
 
+  spv_result_t ValidatePrimitiveShadingRateAtDefinition(
+      const Decoration& decoration, const Instruction& inst);
+
+  spv_result_t ValidateShadingRateAtDefinition(const Decoration& decoration,
+                                               const Instruction& inst);
+
   // The following section contains functions which are called when id defined
   // by |referenced_inst| is
   // 1. referenced by |referenced_from_inst|
@@ -383,6 +391,16 @@
       const Instruction& referenced_inst,
       const Instruction& referenced_from_inst);
 
+  spv_result_t ValidatePrimitiveShadingRateAtReference(
+      const Decoration& decoration, const Instruction& built_in_inst,
+      const Instruction& referenced_inst,
+      const Instruction& referenced_from_inst);
+
+  spv_result_t ValidateShadingRateAtReference(
+      const Decoration& decoration, const Instruction& built_in_inst,
+      const Instruction& referenced_inst,
+      const Instruction& referenced_from_inst);
+
   // Validates that |built_in_inst| is not (even indirectly) referenced from
   // within a function which can be called with |execution_model|.
   //
@@ -3314,6 +3332,142 @@
   return SPV_SUCCESS;
 }
 
+spv_result_t BuiltInsValidator::ValidatePrimitiveShadingRateAtDefinition(
+    const Decoration& decoration, const Instruction& inst) {
+  if (spvIsVulkanEnv(_.context()->target_env)) {
+    if (spv_result_t error = ValidateI32(
+            decoration, inst,
+            [this, &inst,
+             &decoration](const std::string& message) -> spv_result_t {
+              return _.diag(SPV_ERROR_INVALID_DATA, &inst)
+                     << _.VkErrorID(4486)
+                     << "According to the Vulkan spec BuiltIn "
+                     << _.grammar().lookupOperandName(SPV_OPERAND_TYPE_BUILT_IN,
+                                                      decoration.params()[0])
+                     << " variable needs to be a 32-bit int scalar. "
+                     << message;
+            })) {
+      return error;
+    }
+  }
+
+  // Seed at reference checks with this built-in.
+  return ValidatePrimitiveShadingRateAtReference(decoration, inst, inst, inst);
+}
+
+spv_result_t BuiltInsValidator::ValidatePrimitiveShadingRateAtReference(
+    const Decoration& decoration, const Instruction& built_in_inst,
+    const Instruction& referenced_inst,
+    const Instruction& referenced_from_inst) {
+  if (spvIsVulkanEnv(_.context()->target_env)) {
+    const SpvStorageClass storage_class = GetStorageClass(referenced_from_inst);
+    if (storage_class != SpvStorageClassMax &&
+        storage_class != SpvStorageClassOutput) {
+      return _.diag(SPV_ERROR_INVALID_DATA, &referenced_from_inst)
+             << _.VkErrorID(4485) << "Vulkan spec allows BuiltIn "
+             << _.grammar().lookupOperandName(SPV_OPERAND_TYPE_BUILT_IN,
+                                              decoration.params()[0])
+             << " to be only used for variables with Output storage class. "
+             << GetReferenceDesc(decoration, built_in_inst, referenced_inst,
+                                 referenced_from_inst)
+             << " " << GetStorageClassDesc(referenced_from_inst);
+    }
+
+    for (const SpvExecutionModel execution_model : execution_models_) {
+      switch (execution_model) {
+        case SpvExecutionModelVertex:
+        case SpvExecutionModelGeometry:
+        case SpvExecutionModelMeshNV:
+          break;
+        default: {
+          return _.diag(SPV_ERROR_INVALID_DATA, &referenced_from_inst)
+                 << _.VkErrorID(4484) << "Vulkan spec allows BuiltIn "
+                 << _.grammar().lookupOperandName(SPV_OPERAND_TYPE_BUILT_IN,
+                                                  decoration.params()[0])
+                 << " to be used only with Vertex, Geometry, or MeshNV "
+                    "execution models. "
+                 << GetReferenceDesc(decoration, built_in_inst, referenced_inst,
+                                     referenced_from_inst, execution_model);
+        }
+      }
+    }
+  }
+
+  if (function_id_ == 0) {
+    // Propagate this rule to all dependant ids in the global scope.
+    id_to_at_reference_checks_[referenced_from_inst.id()].push_back(
+        std::bind(&BuiltInsValidator::ValidatePrimitiveShadingRateAtReference,
+                  this, decoration, built_in_inst, referenced_from_inst,
+                  std::placeholders::_1));
+  }
+
+  return SPV_SUCCESS;
+}
+
+spv_result_t BuiltInsValidator::ValidateShadingRateAtDefinition(
+    const Decoration& decoration, const Instruction& inst) {
+  if (spvIsVulkanEnv(_.context()->target_env)) {
+    if (spv_result_t error = ValidateI32(
+            decoration, inst,
+            [this, &inst,
+             &decoration](const std::string& message) -> spv_result_t {
+              return _.diag(SPV_ERROR_INVALID_DATA, &inst)
+                     << _.VkErrorID(4492)
+                     << "According to the Vulkan spec BuiltIn "
+                     << _.grammar().lookupOperandName(SPV_OPERAND_TYPE_BUILT_IN,
+                                                      decoration.params()[0])
+                     << " variable needs to be a 32-bit int scalar. "
+                     << message;
+            })) {
+      return error;
+    }
+  }
+
+  // Seed at reference checks with this built-in.
+  return ValidateShadingRateAtReference(decoration, inst, inst, inst);
+}
+
+spv_result_t BuiltInsValidator::ValidateShadingRateAtReference(
+    const Decoration& decoration, const Instruction& built_in_inst,
+    const Instruction& referenced_inst,
+    const Instruction& referenced_from_inst) {
+  if (spvIsVulkanEnv(_.context()->target_env)) {
+    const SpvStorageClass storage_class = GetStorageClass(referenced_from_inst);
+    if (storage_class != SpvStorageClassMax &&
+        storage_class != SpvStorageClassInput) {
+      return _.diag(SPV_ERROR_INVALID_DATA, &referenced_from_inst)
+             << _.VkErrorID(4491) << "Vulkan spec allows BuiltIn "
+             << _.grammar().lookupOperandName(SPV_OPERAND_TYPE_BUILT_IN,
+                                              decoration.params()[0])
+             << " to be only used for variables with Input storage class. "
+             << GetReferenceDesc(decoration, built_in_inst, referenced_inst,
+                                 referenced_from_inst)
+             << " " << GetStorageClassDesc(referenced_from_inst);
+    }
+
+    for (const SpvExecutionModel execution_model : execution_models_) {
+      if (execution_model != SpvExecutionModelFragment) {
+        return _.diag(SPV_ERROR_INVALID_DATA, &referenced_from_inst)
+               << _.VkErrorID(4490) << "Vulkan spec allows BuiltIn "
+               << _.grammar().lookupOperandName(SPV_OPERAND_TYPE_BUILT_IN,
+                                                decoration.params()[0])
+               << " to be used only with the Fragment execution model. "
+               << GetReferenceDesc(decoration, built_in_inst, referenced_inst,
+                                   referenced_from_inst, execution_model);
+      }
+    }
+  }
+
+  if (function_id_ == 0) {
+    // Propagate this rule to all dependant ids in the global scope.
+    id_to_at_reference_checks_[referenced_from_inst.id()].push_back(std::bind(
+        &BuiltInsValidator::ValidateShadingRateAtReference, this, decoration,
+        built_in_inst, referenced_from_inst, std::placeholders::_1));
+  }
+
+  return SPV_SUCCESS;
+}
+
 spv_result_t BuiltInsValidator::ValidateSingleBuiltInAtDefinition(
     const Decoration& decoration, const Instruction& inst) {
   const SpvBuiltIn label = SpvBuiltIn(decoration.params()[0]);
@@ -3514,6 +3668,11 @@
     case SpvBuiltInRayGeometryIndexKHR: {
       // No validation rules (for the moment).
       break;
+
+      case SpvBuiltInPrimitiveShadingRateKHR:
+        return ValidatePrimitiveShadingRateAtDefinition(decoration, inst);
+      case SpvBuiltInShadingRateKHR:
+        return ValidateShadingRateAtDefinition(decoration, inst);
     }
   }
   return SPV_SUCCESS;
diff --git a/test/val/val_builtins_test.cpp b/test/val/val_builtins_test.cpp
index cc9bda6..4248caa 100644
--- a/test/val/val_builtins_test.cpp
+++ b/test/val/val_builtins_test.cpp
@@ -1,4 +1,6 @@
 // Copyright (c) 2018 Google LLC.
+// Modifications Copyright (C) 2020 Advanced Micro Devices, Inc. All rights
+// reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -3723,6 +3725,108 @@
   EXPECT_EQ(SPV_SUCCESS, ValidateInstructions());
 }
 
+INSTANTIATE_TEST_SUITE_P(
+    PrimitiveShadingRateOutputSuccess,
+    ValidateVulkanCombineBuiltInExecutionModelDataTypeCapabilityExtensionResult,
+    Combine(Values("PrimitiveShadingRateKHR"), Values("Vertex", "Geometry"),
+            Values("Output"), Values("%u32"),
+            Values("OpCapability FragmentShadingRateKHR\n"),
+            Values("OpExtension \"SPV_KHR_fragment_shading_rate\"\n"),
+            Values(nullptr), Values(TestResult())));
+
+INSTANTIATE_TEST_SUITE_P(
+    PrimitiveShadingRateMeshOutputSuccess,
+    ValidateVulkanCombineBuiltInExecutionModelDataTypeCapabilityExtensionResult,
+    Combine(Values("PrimitiveShadingRateKHR"), Values("MeshNV"),
+            Values("Output"), Values("%u32"),
+            Values("OpCapability FragmentShadingRateKHR\nOpCapability "
+                   "MeshShadingNV\n"),
+            Values("OpExtension \"SPV_KHR_fragment_shading_rate\"\nOpExtension "
+                   "\"SPV_NV_mesh_shader\"\n"),
+            Values(nullptr), Values(TestResult())));
+
+INSTANTIATE_TEST_SUITE_P(
+    PrimitiveShadingRateInvalidExecutionModel,
+    ValidateVulkanCombineBuiltInExecutionModelDataTypeCapabilityExtensionResult,
+    Combine(
+        Values("PrimitiveShadingRateKHR"), Values("Fragment"), Values("Output"),
+        Values("%u32"), Values("OpCapability FragmentShadingRateKHR\n"),
+        Values("OpExtension \"SPV_KHR_fragment_shading_rate\"\n"),
+        Values("VUID-PrimitiveShadingRateKHR-PrimitiveShadingRateKHR-04484 "),
+        Values(TestResult(
+            SPV_ERROR_INVALID_DATA,
+            "Vulkan spec allows BuiltIn PrimitiveShadingRateKHR to be used "
+            "only with Vertex, Geometry, or MeshNV execution models."))));
+
+INSTANTIATE_TEST_SUITE_P(
+    PrimitiveShadingRateInvalidStorageClass,
+    ValidateVulkanCombineBuiltInExecutionModelDataTypeCapabilityExtensionResult,
+    Combine(
+        Values("PrimitiveShadingRateKHR"), Values("Vertex"), Values("Input"),
+        Values("%u32"), Values("OpCapability FragmentShadingRateKHR\n"),
+        Values("OpExtension \"SPV_KHR_fragment_shading_rate\"\n"),
+        Values("VUID-PrimitiveShadingRateKHR-PrimitiveShadingRateKHR-04485 "),
+        Values(TestResult(
+            SPV_ERROR_INVALID_DATA,
+            "Vulkan spec allows BuiltIn PrimitiveShadingRateKHR to be only "
+            "used for variables with Output storage class."))));
+
+INSTANTIATE_TEST_SUITE_P(
+    PrimitiveShadingRateInvalidType,
+    ValidateVulkanCombineBuiltInExecutionModelDataTypeCapabilityExtensionResult,
+    Combine(
+        Values("PrimitiveShadingRateKHR"), Values("Vertex"), Values("Output"),
+        Values("%f32"), Values("OpCapability FragmentShadingRateKHR\n"),
+        Values("OpExtension \"SPV_KHR_fragment_shading_rate\"\n"),
+        Values("VUID-PrimitiveShadingRateKHR-PrimitiveShadingRateKHR-04485 "),
+        Values(TestResult(
+            SPV_ERROR_INVALID_DATA,
+            "According to the Vulkan spec BuiltIn PrimitiveShadingRateKHR "
+            "variable needs to be a 32-bit int scalar."))));
+
+INSTANTIATE_TEST_SUITE_P(
+    ShadingRateInputSuccess,
+    ValidateVulkanCombineBuiltInExecutionModelDataTypeCapabilityExtensionResult,
+    Combine(Values("ShadingRateKHR"), Values("Fragment"), Values("Input"),
+            Values("%u32"), Values("OpCapability FragmentShadingRateKHR\n"),
+            Values("OpExtension \"SPV_KHR_fragment_shading_rate\"\n"),
+            Values(nullptr), Values(TestResult())));
+
+INSTANTIATE_TEST_SUITE_P(
+    ShadingRateInvalidExecutionModel,
+    ValidateVulkanCombineBuiltInExecutionModelDataTypeCapabilityExtensionResult,
+    Combine(Values("ShadingRateKHR"), Values("Vertex"), Values("Input"),
+            Values("%u32"), Values("OpCapability FragmentShadingRateKHR\n"),
+            Values("OpExtension \"SPV_KHR_fragment_shading_rate\"\n"),
+            Values("VUID-ShadingRateKHR-ShadingRateKHR-04490 "),
+            Values(TestResult(
+                SPV_ERROR_INVALID_DATA,
+                "Vulkan spec allows BuiltIn ShadingRateKHR to be used "
+                "only with the Fragment execution model."))));
+
+INSTANTIATE_TEST_SUITE_P(
+    ShadingRateInvalidStorageClass,
+    ValidateVulkanCombineBuiltInExecutionModelDataTypeCapabilityExtensionResult,
+    Combine(Values("ShadingRateKHR"), Values("Fragment"), Values("Output"),
+            Values("%u32"), Values("OpCapability FragmentShadingRateKHR\n"),
+            Values("OpExtension \"SPV_KHR_fragment_shading_rate\"\n"),
+            Values("VUID-ShadingRateKHR-ShadingRateKHR-04491 "),
+            Values(TestResult(
+                SPV_ERROR_INVALID_DATA,
+                "Vulkan spec allows BuiltIn ShadingRateKHR to be only "
+                "used for variables with Input storage class."))));
+
+INSTANTIATE_TEST_SUITE_P(
+    ShadingRateInvalidType,
+    ValidateVulkanCombineBuiltInExecutionModelDataTypeCapabilityExtensionResult,
+    Combine(
+        Values("ShadingRateKHR"), Values("Fragment"), Values("Input"),
+        Values("%f32"), Values("OpCapability FragmentShadingRateKHR\n"),
+        Values("OpExtension \"SPV_KHR_fragment_shading_rate\"\n"),
+        Values("VUID-ShadingRateKHR-ShadingRateKHR-04492 "),
+        Values(TestResult(SPV_ERROR_INVALID_DATA,
+                          "According to the Vulkan spec BuiltIn ShadingRateKHR "
+                          "variable needs to be a 32-bit int scalar."))));
 }  // namespace
 }  // namespace val
 }  // namespace spvtools