fn isaac64()

in sgx_rand/src/isaac.rs [378:440]
54 lines of code
5 McCabe index (conditional complexity)

    fn isaac64(&mut self) {
        self.c = self.c + w(1);
        // abbreviations
        let mut a = self.a;
        let mut b = self.b + self.c;
        const MIDPOINT: usize =  RAND_SIZE_64 / 2;
        const MP_VEC: [(usize, usize); 2] = [(0,MIDPOINT), (MIDPOINT, 0)];
        macro_rules! ind {
            ($x:expr) => {
                *self.mem.get_unchecked((($x >> 3usize).0 as usize) & (RAND_SIZE_64 - 1))
            }
        }

        for &(mr_offset, m2_offset) in MP_VEC.iter() {
            for base in (0..MIDPOINT / 4).map(|i| i * 4) {

                macro_rules! rngstepp {
                    ($j:expr, $shift:expr) => {{
                        let base = base + $j;
                        let mix = a ^ (a << $shift);
                        let mix = if $j == 0 {!mix} else {mix};

                        unsafe {
                            let x = *self.mem.get_unchecked(base + mr_offset);
                            a = mix + *self.mem.get_unchecked(base + m2_offset);
                            let y = ind!(x) + a + b;
                            *self.mem.get_unchecked_mut(base + mr_offset) = y;

                            b = ind!(y >> RAND_SIZE_64_LEN) + x;
                            *self.rsl.get_unchecked_mut(base + mr_offset) = b;
                        }
                    }}
                }

                macro_rules! rngstepn {
                    ($j:expr, $shift:expr) => {{
                        let base = base + $j;
                        let mix = a ^ (a >> $shift);
                        let mix = if $j == 0 {!mix} else {mix};

                        unsafe {
                            let x = *self.mem.get_unchecked(base + mr_offset);
                            a = mix + *self.mem.get_unchecked(base + m2_offset);
                            let y = ind!(x) + a + b;
                            *self.mem.get_unchecked_mut(base + mr_offset) = y;

                            b = ind!(y >> RAND_SIZE_64_LEN) + x;
                            *self.rsl.get_unchecked_mut(base + mr_offset) = b;
                        }
                    }}
                }

                rngstepp!(0, 21);
                rngstepn!(1, 5);
                rngstepp!(2, 12);
                rngstepn!(3, 33);
            }
        }

        self.a = a;
        self.b = b;
        self.cnt = RAND_SIZE_64;
    }