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This function uses __builtin_amdgcn_atomic_inc32(): uint32_t atomicInc(uint32_t *address, uint32_t max); These functions use __builtin_amdgcn_fence(): __kmpc_impl_threadfence() __kmpc_impl_threadfence_block() __kmpc_impl_threadfence_system() They will take place of current mechanism of directly calling IR functions. Reviewed By: JonChesterfield Differential Revision: https://reviews.llvm.org/D83132