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    //! ARMv6 intrinsics.
    //!
    //! The reference is [ARMv6-M Architecture Reference Manual][armv6m].
    //!
    //! [armv6m]:
    //! http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0419c/index.
    //! html

    #[cfg(test)]
    use stdsimd_test::assert_instr;

    /// Reverse the order of the bytes.
    #[inline]
    #[cfg_attr(test, assert_instr(rev))]
    pub unsafe fn _rev_u16(x: u16) -> u16 {
        x.swap_bytes() as u16
    }

    /// Reverse the order of the bytes.
    #[inline]
    #[cfg_attr(test, assert_instr(rev))]
    pub unsafe fn _rev_u32(x: u32) -> u32 {
        x.swap_bytes() as u32
    }

    #[cfg(test)]
    mod tests {
        use crate::core_arch::arm::v6;

        #[test]
        fn _rev_u16() {
            unsafe {
                assert_eq!(
                    v6::_rev_u16(0b0000_0000_1111_1111_u16),
                    0b1111_1111_0000_0000_u16
                );
            }
        }

        #[test]
        fn _rev_u32() {
            unsafe {
                assert_eq!(
                    v6::_rev_u32(0b0000_0000_1111_1111_0000_0000_1111_1111_u32),
                    0b1111_1111_0000_0000_1111_1111_0000_0000_u32
                );
            }
        }
    }

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