Index: clang/lib/Headers/opencl-c-base.h
===================================================================
--- clang/lib/Headers/opencl-c-base.h
+++ clang/lib/Headers/opencl-c-base.h
@@ -21,6 +21,25 @@
 #define cl_khr_subgroup_shuffle 1
 #define cl_khr_subgroup_shuffle_relative 1
 #define cl_khr_subgroup_clustered_reduce 1
+#define cl_ext_float_atomics
+#ifdef cl_khr_fp16
+#define __opencl_c_ext_fp16_global_atomic_load_store 1
+#define __opencl_c_ext_fp16_local_atomic_load_store 1
+#define __opencl_c_ext_fp16_global_atomic_add 1
+#define __opencl_c_ext_fp16_local_atomic_add 1
+#define __opencl_c_ext_fp16_global_atomic_min_max 1
+#define __opencl_c_ext_fp16_local_atomic_min_max 1
+#endif
+#ifdef __opencl_c_fp64
+#define __opencl_c_ext_fp64_global_atomic_add 1
+#define __opencl_c_ext_fp64_local_atomic_add 1
+#define __opencl_c_ext_fp64_global_atomic_min_max 1
+#define __opencl_c_ext_fp64_local_atomic_min_max 1
+#endif
+#define __opencl_c_ext_fp32_global_atomic_add 1
+#define __opencl_c_ext_fp32_local_atomic_add 1
+#define __opencl_c_ext_fp32_global_atomic_min_max 1
+#define __opencl_c_ext_fp32_local_atomic_min_max 1
 #endif // defined(__SPIR__)
 #endif // (defined(__OPENCL_CPP_VERSION__) || __OPENCL_C_VERSION__ >= 200)
 
Index: clang/lib/Headers/opencl-c.h
===================================================================
--- clang/lib/Headers/opencl-c.h
+++ clang/lib/Headers/opencl-c.h
@@ -13415,6 +13415,205 @@
 uintptr_t __ovld atomic_fetch_sub_explicit(volatile atomic_uintptr_t *object, ptrdiff_t operand, memory_order order, memory_scope scope);
 #endif
 
+#if defined(cl_ext_float_atomics)
+
+#if defined(__opencl_c_ext_fp32_global_atomic_min_max)
+float __ovld atomic_fetch_min(volatile __global atomic_float *object,
+                              float operand);
+float __ovld atomic_fetch_max(volatile __global atomic_float *object,
+                              float operand);
+float __ovld atomic_fetch_min_explicit(volatile __global atomic_float *object,
+                                       float operand, memory_order order);
+float __ovld atomic_fetch_max_explicit(volatile __global atomic_float *object,
+                                       float operand, memory_order order);
+float __ovld atomic_fetch_min_explicit(volatile __global atomic_float *object,
+                                       float operand, memory_order order,
+                                       memory_scope scope);
+float __ovld atomic_fetch_max_explicit(volatile __global atomic_float *object,
+                                       float operand, memory_order order,
+                                       memory_scope scope);
+#endif
+#if defined(__opencl_c_ext_fp32_local_atomic_min_max)
+float __ovld atomic_fetch_min(volatile __local atomic_float *object,
+                              float operand);
+float __ovld atomic_fetch_max(volatile __local atomic_float *object,
+                              float operand);
+float __ovld atomic_fetch_min_explicit(volatile __local atomic_float *object,
+                                       float operand, memory_order order);
+float __ovld atomic_fetch_max_explicit(volatile __local atomic_float *object,
+                                       float operand, memory_order order);
+float __ovld atomic_fetch_min_explicit(volatile __local atomic_float *object,
+                                       float operand, memory_order order,
+                                       memory_scope scope);
+float __ovld atomic_fetch_max_explicit(volatile __local atomic_float *object,
+                                       float operand, memory_order order,
+                                       memory_scope scope);
+#endif
+#if defined(__opencl_c_ext_fp32_global_atomic_min_max) ||                      \
+    defined(__opencl_c_ext_fp32_local_atomic_min_max)
+float __ovld atomic_fetch_min(volatile atomic_float *object, float operand);
+float __ovld atomic_fetch_max(volatile atomic_float *object, float operand);
+float __ovld atomic_fetch_min_explicit(volatile atomic_float *object,
+                                       float operand, memory_order order);
+float __ovld atomic_fetch_max_explicit(volatile atomic_float *object,
+                                       float operand, memory_order order);
+float __ovld atomic_fetch_min_explicit(volatile atomic_float *object,
+                                       float operand, memory_order order,
+                                       memory_scope scope);
+float __ovld atomic_fetch_max_explicit(volatile atomic_float *object,
+                                       float operand, memory_order order,
+                                       memory_scope scope);
+#endif
+#if defined(__opencl_c_ext_fp64_global_atomic_min_max)
+double __ovld atomic_fetch_min(volatile __global atomic_double *object,
+                               double operand);
+double __ovld atomic_fetch_max(volatile __global atomic_double *object,
+                               double operand);
+double __ovld atomic_fetch_min_explicit(volatile __global atomic_double *object,
+                                        double operand, memory_order order);
+double __ovld atomic_fetch_max_explicit(volatile __global atomic_double *object,
+                                        double operand, memory_order order);
+double __ovld atomic_fetch_min_explicit(volatile __global atomic_double *object,
+                                        double operand, memory_order order,
+                                        memory_scope scope);
+double __ovld atomic_fetch_max_explicit(volatile __global atomic_double *object,
+                                        double operand, memory_order order,
+                                        memory_scope scope);
+#endif
+#if defined(__opencl_c_ext_fp64_local_atomic_min_max)
+double __ovld atomic_fetch_min(volatile __local atomic_double *object,
+                               double operand);
+double __ovld atomic_fetch_max(volatile __local atomic_double *object,
+                               double operand);
+double __ovld atomic_fetch_min_explicit(volatile __local atomic_double *object,
+                                        double operand, memory_order order);
+double __ovld atomic_fetch_max_explicit(volatile __local atomic_double *object,
+                                        double operand, memory_order order);
+double __ovld atomic_fetch_min_explicit(volatile __local atomic_double *object,
+                                        double operand, memory_order order,
+                                        memory_scope scope);
+double __ovld atomic_fetch_max_explicit(volatile __local atomic_double *object,
+                                        double operand, memory_order order,
+                                        memory_scope scope);
+#endif
+#if defined(__opencl_c_ext_fp64_global_atomic_min_max) ||                      \
+    defined(__opencl_c_ext_fp64_local_atomic_min_max)
+double __ovld atomic_fetch_min(volatile atomic_double *object, double operand);
+double __ovld atomic_fetch_max(volatile atomic_double *object, double operand);
+double __ovld atomic_fetch_min_explicit(volatile atomic_double *object,
+                                        double operand, memory_order order);
+double __ovld atomic_fetch_max_explicit(volatile atomic_double *object,
+                                        double operand, memory_order order);
+double __ovld atomic_fetch_min_explicit(volatile atomic_double *object,
+                                        double operand, memory_order order,
+                                        memory_scope scope);
+double __ovld atomic_fetch_max_explicit(volatile atomic_double *object,
+                                        double operand, memory_order order,
+                                        memory_scope scope);
+#endif
+
+#endif // cl_ext_float_atomics
+
+#if defined(cl_ext_float_atomics)
+
+#if defined(__opencl_c_ext_fp32_global_atomic_add)
+float __ovld atomic_fetch_add(volatile __global atomic_float *object,
+                              float operand);
+float __ovld atomic_fetch_sub(volatile __global atomic_float *object,
+                              float operand);
+float __ovld atomic_fetch_add_explicit(volatile __global atomic_float *object,
+                                       float operand, memory_order order);
+float __ovld atomic_fetch_sub_explicit(volatile __global atomic_float *object,
+                                       float operand, memory_order order);
+float __ovld atomic_fetch_add_explicit(volatile __global atomic_float *object,
+                                       float operand, memory_order order,
+                                       memory_scope scope);
+float __ovld atomic_fetch_sub_explicit(volatile __global atomic_float *object,
+                                       float operand, memory_order order,
+                                       memory_scope scope);
+#endif
+#if defined(__opencl_c_ext_fp32_local_atomic_add)
+float __ovld atomic_fetch_add(volatile __local atomic_float *object,
+                              float operand);
+float __ovld atomic_fetch_sub(volatile __local atomic_float *object,
+                              float operand);
+float __ovld atomic_fetch_add_explicit(volatile __local atomic_float *object,
+                                       float operand, memory_order order);
+float __ovld atomic_fetch_sub_explicit(volatile __local atomic_float *object,
+                                       float operand, memory_order order);
+float __ovld atomic_fetch_add_explicit(volatile __local atomic_float *object,
+                                       float operand, memory_order order,
+                                       memory_scope scope);
+float __ovld atomic_fetch_sub_explicit(volatile __local atomic_float *object,
+                                       float operand, memory_order order,
+                                       memory_scope scope);
+#endif
+#if defined(__opencl_c_ext_fp32_global_atomic_add) ||                          \
+    defined(__opencl_c_ext_fp32_local_atomic_add)
+float __ovld atomic_fetch_add(volatile atomic_float *object, float operand);
+float __ovld atomic_fetch_sub(volatile atomic_float *object, float operand);
+float __ovld atomic_fetch_add_explicit(volatile atomic_float *object,
+                                       float operand, memory_order order);
+float __ovld atomic_fetch_sub_explicit(volatile atomic_float *object,
+                                       float operand, memory_order order);
+float __ovld atomic_fetch_add_explicit(volatile atomic_float *object,
+                                       float operand, memory_order order,
+                                       memory_scope scope);
+float __ovld atomic_fetch_sub_explicit(volatile atomic_float *object,
+                                       float operand, memory_order order,
+                                       memory_scope scope);
+#endif
+
+#if defined(__opencl_c_ext_fp64_global_atomic_add)
+double __ovld atomic_fetch_add(volatile __global atomic_double *object,
+                               double operand);
+double __ovld atomic_fetch_sub(volatile __global atomic_double *object,
+                               double operand);
+double __ovld atomic_fetch_add_explicit(volatile __global atomic_double *object,
+                                        double operand, memory_order order);
+double __ovld atomic_fetch_sub_explicit(volatile __global atomic_double *object,
+                                        double operand, memory_order order);
+double __ovld atomic_fetch_add_explicit(volatile __global atomic_double *object,
+                                        double operand, memory_order order,
+                                        memory_scope scope);
+double __ovld atomic_fetch_sub_explicit(volatile __global atomic_double *object,
+                                        double operand, memory_order order,
+                                        memory_scope scope);
+#endif
+#if defined(__opencl_c_ext_fp64_local_atomic_add)
+double __ovld atomic_fetch_add(volatile __local atomic_double *object,
+                               double operand);
+double __ovld atomic_fetch_sub(volatile __local atomic_double *object,
+                               double operand);
+double __ovld atomic_fetch_add_explicit(volatile __local atomic_double *object,
+                                        double operand, memory_order order);
+double __ovld atomic_fetch_sub_explicit(volatile __local atomic_double *object,
+                                        double operand, memory_order order);
+double __ovld atomic_fetch_add_explicit(volatile __local atomic_double *object,
+                                        double operand, memory_order order,
+                                        memory_scope scope);
+double __ovld atomic_fetch_sub_explicit(volatile __local atomic_double *object,
+                                        double operand, memory_order order,
+                                        memory_scope scope);
+#endif
+#if defined(__opencl_c_ext_fp64_global_atomic_add) ||                          \
+    defined(__opencl_c_ext_fp64_local_atomic_add)
+double __ovld atomic_fetch_add(volatile atomic_double *object, double operand);
+double __ovld atomic_fetch_sub(volatile atomic_double *object, double operand);
+double __ovld atomic_fetch_add_explicit(volatile atomic_double *object,
+                                        double operand, memory_order order);
+double __ovld atomic_fetch_sub_explicit(volatile atomic_double *object,
+                                        double operand, memory_order order);
+double __ovld atomic_fetch_add_explicit(volatile atomic_double *object,
+                                        double operand, memory_order order,
+                                        memory_scope scope);
+double __ovld atomic_fetch_sub_explicit(volatile atomic_double *object,
+                                        double operand, memory_order order,
+                                        memory_scope scope);
+#endif
+
+#endif // cl_ext_float_atomics
+
 // atomic_store()
 
 void __ovld atomic_store(volatile atomic_int *object, int desired);
Index: clang/test/Headers/opencl-c-header.cl
===================================================================
--- clang/test/Headers/opencl-c-header.cl
+++ clang/test/Headers/opencl-c-header.cl
@@ -123,7 +123,36 @@
 #if cl_khr_subgroup_clustered_reduce != 1
 #error "Incorrectly defined cl_khr_subgroup_clustered_reduce"
 #endif
-
+#if __opencl_c_ext_fp16_global_atomic_load_store != 1
+#error "Incorrectly defined __opencl_c_ext_fp16_global_atomic_load_store"
+#endif
+#if __opencl_c_ext_fp16_local_atomic_load_store != 1
+#error "Incorrectly defined __opencl_c_ext_fp16_local_atomic_load_store"
+#endif
+#if __opencl_c_ext_fp16_global_atomic_add != 1
+#error "Incorrectly defined __opencl_c_ext_fp16_global_atomic_add"
+#endif
+#if __opencl_c_ext_fp32_global_atomic_add != 1
+#error "Incorrectly defined __opencl_c_ext_fp32_global_atomic_add"
+#endif
+#if __opencl_c_ext_fp16_local_atomic_add != 1
+#error "Incorrectly defined __opencl_c_ext_fp16_local_atomic_add"
+#endif
+#if __opencl_c_ext_fp32_local_atomic_add != 1
+#error "Incorrectly defined __opencl_c_ext_fp32_local_atomic_add"
+#endif
+#if __opencl_c_ext_fp16_global_atomic_min_max != 1
+#error "Incorrectly defined __opencl_c_ext_fp16_global_atomic_min_max"
+#endif
+#if __opencl_c_ext_fp32_global_atomic_min_max != 1
+#error "Incorrectly defined __opencl_c_ext_fp32_global_atomic_min_max"
+#endif
+#if __opencl_c_ext_fp16_local_atomic_min_max != 1
+#error "Incorrectly defined __opencl_c_ext_fp16_local_atomic_min_max"
+#endif
+#if __opencl_c_ext_fp32_local_atomic_min_max != 1
+#error "Incorrectly defined __opencl_c_ext_fp32_local_atomic_min_max"
+#endif
 #else
 
 #ifdef cl_khr_subgroup_extended_types
@@ -147,6 +176,48 @@
 #ifdef cl_khr_subgroup_clustered_reduce
 #error "Incorrect cl_khr_subgroup_clustered_reduce define"
 #endif
+#ifdef __opencl_c_ext_fp16_global_atomic_load_store
+#error "Incorrectly __opencl_c_ext_fp16_global_atomic_load_store defined"
+#endif
+#ifdef __opencl_c_ext_fp16_local_atomic_load_store
+#error "Incorrectly __opencl_c_ext_fp16_local_atomic_load_store defined"
+#endif
+#ifdef __opencl_c_ext_fp16_global_atomic_add
+#error "Incorrectly __opencl_c_ext_fp16_global_atomic_add defined"
+#endif
+#ifdef __opencl_c_ext_fp32_global_atomic_add
+#error "Incorrectly __opencl_c_ext_fp32_global_atomic_add defined"
+#endif
+#ifdef __opencl_c_ext_fp64_global_atomic_add
+#error "Incorrectly __opencl_c_ext_fp64_global_atomic_add defined"
+#endif
+#ifdef __opencl_c_ext_fp16_local_atomic_add
+#error "Incorrectly __opencl_c_ext_fp16_local_atomic_add defined"
+#endif
+#ifdef __opencl_c_ext_fp32_local_atomic_add
+#error "Incorrectly __opencl_c_ext_fp32_local_atomic_add defined"
+#endif
+#ifdef __opencl_c_ext_fp64_local_atomic_add
+#error "Incorrectly __opencl_c_ext_fp64_local_atomic_add defined"
+#endif
+#ifdef __opencl_c_ext_fp16_global_atomic_min_max
+#error "Incorrectly __opencl_c_ext_fp16_global_atomic_min_max defined"
+#endif
+#ifdef __opencl_c_ext_fp32_global_atomic_min_max
+#error "Incorrectly __opencl_c_ext_fp32_global_atomic_min_max defined"
+#endif
+#ifdef __opencl_c_ext_fp64_global_atomic_min_max
+#error "Incorrectly __opencl_c_ext_fp64_global_atomic_min_max defined"
+#endif
+#ifdef __opencl_c_ext_fp16_local_atomic_min_max
+#error "Incorrectly __opencl_c_ext_fp16_local_atomic_min_max defined"
+#endif
+#ifdef __opencl_c_ext_fp32_local_atomic_min_max
+#error "Incorrectly __opencl_c_ext_fp32_local_atomic_min_max defined"
+#endif
+#ifdef __opencl_c_ext_fp64_local_atomic_min_max
+#error "Incorrectly __opencl_c_ext_fp64_local_atomic_min_max defined"
+#endif
 
 #endif //(defined(__OPENCL_CPP_VERSION__) || __OPENCL_C_VERSION__ >= 200)
 
@@ -237,7 +308,6 @@
 #ifdef __opencl_c_subgroups
 #error "Incorrect feature macro __opencl_c_subgroups define"
 #endif
-
 #endif //(defined(__OPENCL_CPP_VERSION__) || __OPENCL_C_VERSION__ == 200)
 
 #endif // defined(__SPIR__)