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    //! NVPTX intrinsics (experimental)
    //!
    //! These intrinsics form the foundation of the CUDA
    //! programming model.
    //!
    //! The reference is the [CUDA C Programming Guide][cuda_c]. Relevant is also
    //! the [LLVM NVPTX Backend documentation][llvm_docs].
    //!
    //! [cuda_c]:
    //! http://docs.nvidia.com/cuda/cuda-c-programming-guide/index.html
    //! [llvm_docs]:
    //! https://llvm.org/docs/NVPTXUsage.html

    #[allow(improper_ctypes)]
    extern "C" {
        #[link_name = "llvm.cuda.syncthreads"]
        fn syncthreads() -> ();
        #[link_name = "llvm.nvvm.read.ptx.sreg.ntid.x"]
        fn block_dim_x() -> i32;
        #[link_name = "llvm.nvvm.read.ptx.sreg.ntid.y"]
        fn block_dim_y() -> i32;
        #[link_name = "llvm.nvvm.read.ptx.sreg.ntid.z"]
        fn block_dim_z() -> i32;
        #[link_name = "llvm.nvvm.read.ptx.sreg.ctaid.x"]
        fn block_idx_x() -> i32;
        #[link_name = "llvm.nvvm.read.ptx.sreg.ctaid.y"]
        fn block_idx_y() -> i32;
        #[link_name = "llvm.nvvm.read.ptx.sreg.ctaid.z"]
        fn block_idx_z() -> i32;
        #[link_name = "llvm.nvvm.read.ptx.sreg.nctaid.x"]
        fn grid_dim_x() -> i32;
        #[link_name = "llvm.nvvm.read.ptx.sreg.nctaid.y"]
        fn grid_dim_y() -> i32;
        #[link_name = "llvm.nvvm.read.ptx.sreg.nctaid.z"]
        fn grid_dim_z() -> i32;
        #[link_name = "llvm.nvvm.read.ptx.sreg.tid.x"]
        fn thread_idx_x() -> i32;
        #[link_name = "llvm.nvvm.read.ptx.sreg.tid.y"]
        fn thread_idx_y() -> i32;
        #[link_name = "llvm.nvvm.read.ptx.sreg.tid.z"]
        fn thread_idx_z() -> i32;
    }

    /// Synchronizes all threads in the block.
    #[inline]
    pub unsafe fn _syncthreads() -> () {
        syncthreads()
    }

    /// x-th thread-block dimension.
    #[inline]
    pub unsafe fn _block_dim_x() -> i32 {
        block_dim_x()
    }

    /// y-th thread-block dimension.
    #[inline]
    pub unsafe fn _block_dim_y() -> i32 {
        block_dim_y()
    }

    /// z-th thread-block dimension.
    #[inline]
    pub unsafe fn _block_dim_z() -> i32 {
        block_dim_z()
    }

    /// x-th thread-block index.
    #[inline]
    pub unsafe fn _block_idx_x() -> i32 {
        block_idx_x()
    }

    /// y-th thread-block index.
    #[inline]
    pub unsafe fn _block_idx_y() -> i32 {
        block_idx_y()
    }

    /// z-th thread-block index.
    #[inline]
    pub unsafe fn _block_idx_z() -> i32 {
        block_idx_z()
    }

    /// x-th block-grid dimension.
    #[inline]
    pub unsafe fn _grid_dim_x() -> i32 {
        grid_dim_x()
    }

    /// y-th block-grid dimension.
    #[inline]
    pub unsafe fn _grid_dim_y() -> i32 {
        grid_dim_y()
    }

    /// z-th block-grid dimension.
    #[inline]
    pub unsafe fn _grid_dim_z() -> i32 {
        grid_dim_z()
    }

    /// x-th thread index.
    #[inline]
    pub unsafe fn _thread_idx_x() -> i32 {
        thread_idx_x()
    }

    /// y-th thread index.
    #[inline]
    pub unsafe fn _thread_idx_y() -> i32 {
        thread_idx_y()
    }

    /// z-th thread index.
    #[inline]
    pub unsafe fn _thread_idx_z() -> i32 {
        thread_idx_z()
    }

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