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    //! Main Stack Pointer

    /// Reads the CPU register
    #[inline]
    pub fn read() -> u32 {
        match () {
            #[cfg(all(cortex_m, feature = "inline-asm"))]
            () => {
                let r;
                unsafe { asm!("mrs $0,MSP" : "=r"(r) ::: "volatile") }
                r
            }

            #[cfg(all(cortex_m, not(feature = "inline-asm")))]
            () => unsafe {
                extern "C" {
                    fn __msp_r() -> u32;
                }

                __msp_r()
            },

            #[cfg(not(cortex_m))]
            () => unimplemented!(),
        }
    }

    /// Writes `bits` to the CPU register
    #[inline]
    pub unsafe fn write(_bits: u32) {
        match () {
            #[cfg(all(cortex_m, feature = "inline-asm"))]
            () => asm!("msr MSP,$0" :: "r"(_bits) :: "volatile"),

            #[cfg(all(cortex_m, not(feature = "inline-asm")))]
            () => {
                extern "C" {
                    fn __msp_w(_: u32);
                }

                __msp_w(_bits);
            }

            #[cfg(not(cortex_m))]
            () => unimplemented!(),
        }
    }

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