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

    /// Returns the bit in position `b` of the memory addressed by `p`.
    #[inline]
    #[cfg_attr(test, assert_instr(bt))]
    #[unstable(feature = "simd_x86_bittest", issue = "59414")]
    pub unsafe fn _bittest64(p: *const i64, b: i64) -> u8 {
        let r: u8;
        llvm_asm!("btq $2, $1\n\tsetc ${0:b}"
                  : "=r"(r)
                  : "*m"(p), "r"(b)
                  : "cc", "memory");
        r
    }

    /// Returns the bit in position `b` of the memory addressed by `p`, then sets the bit to `1`.
    #[inline]
    #[cfg_attr(test, assert_instr(bts))]
    #[unstable(feature = "simd_x86_bittest", issue = "59414")]
    pub unsafe fn _bittestandset64(p: *mut i64, b: i64) -> u8 {
        let r: u8;
        llvm_asm!("btsq $2, $1\n\tsetc ${0:b}"
                  : "=r"(r), "+*m"(p)
                  : "r"(b)
                  : "cc", "memory");
        r
    }

    /// Returns the bit in position `b` of the memory addressed by `p`, then resets that bit to `0`.
    #[inline]
    #[cfg_attr(test, assert_instr(btr))]
    #[unstable(feature = "simd_x86_bittest", issue = "59414")]
    pub unsafe fn _bittestandreset64(p: *mut i64, b: i64) -> u8 {
        let r: u8;
        llvm_asm!("btrq $2, $1\n\tsetc ${0:b}"
                  : "=r"(r), "+*m"(p)
                  : "r"(b)
                  : "cc", "memory");
        r
    }

    /// Returns the bit in position `b` of the memory addressed by `p`, then inverts that bit.
    #[inline]
    #[cfg_attr(test, assert_instr(btc))]
    #[unstable(feature = "simd_x86_bittest", issue = "59414")]
    pub unsafe fn _bittestandcomplement64(p: *mut i64, b: i64) -> u8 {
        let r: u8;
        llvm_asm!("btcq $2, $1\n\tsetc ${0:b}"
                  : "=r"(r), "+*m"(p)
                  : "r"(b)
                  : "cc", "memory");
        r
    }

    #[cfg(test)]
    mod tests {
        use crate::core_arch::x86_64::*;

        #[test]
        fn test_bittest64() {
            unsafe {
                let a = 0b0101_0000i64;
                assert_eq!(_bittest64(&a as _, 4), 1);
                assert_eq!(_bittest64(&a as _, 5), 0);
            }
        }

        #[test]
        fn test_bittestandset64() {
            unsafe {
                let mut a = 0b0101_0000i64;
                assert_eq!(_bittestandset64(&mut a as _, 4), 1);
                assert_eq!(_bittestandset64(&mut a as _, 4), 1);
                assert_eq!(_bittestandset64(&mut a as _, 5), 0);
                assert_eq!(_bittestandset64(&mut a as _, 5), 1);
            }
        }

        #[test]
        fn test_bittestandreset64() {
            unsafe {
                let mut a = 0b0101_0000i64;
                assert_eq!(_bittestandreset64(&mut a as _, 4), 1);
                assert_eq!(_bittestandreset64(&mut a as _, 4), 0);
                assert_eq!(_bittestandreset64(&mut a as _, 5), 0);
                assert_eq!(_bittestandreset64(&mut a as _, 5), 0);
            }
        }

        #[test]
        fn test_bittestandcomplement64() {
            unsafe {
                let mut a = 0b0101_0000i64;
                assert_eq!(_bittestandcomplement64(&mut a as _, 4), 1);
                assert_eq!(_bittestandcomplement64(&mut a as _, 4), 0);
                assert_eq!(_bittestandcomplement64(&mut a as _, 4), 1);
                assert_eq!(_bittestandcomplement64(&mut a as _, 5), 0);
                assert_eq!(_bittestandcomplement64(&mut a as _, 5), 1);
            }
        }
    }