// ************************************************************************** //
//                                                                            //
//    eses                   eses                                             //
//   eses                     eses                                            //
//  eses    eseses  esesese    eses   Embedded Systems Group                  //
//  ese    ese  ese ese         ese                                           //
//  ese    eseseses eseseses    ese   Department of Computer Science          //
//  eses   eses          ese   eses                                           //
//   eses   eseses  eseseses  eses    University of Kaiserslautern            //
//    eses                   eses                                             //
//                                                                            //
// ************************************************************************** //


nat x0,x1,x2,x3,x4,x5,x6,x7;
nat y0,y1,y2,y3,y4,y5,y6,y7;
nat s0,s1,s2,s3,s4,s5,s6,s7,s8;

thread RadixBAddCarryLookahead8 {
    bool g0,g1,g2,g3,g4,g5,g6,g7;
    bool p0,p1,p2,p3,p4,p5,p6,p7;
    // preliminary sum digits
    s0 = x0 + y0;
    s1 = x1 + y1;
    s2 = x2 + y2;
    s3 = x3 + y3;
    s4 = x4 + y4;
    s5 = x5 + y5;
    s6 = x6 + y6;
    s7 = x7 + y7;
    // initial generate conditions
    g0 = s0>255;
    g1 = s1>255;
    g2 = s2>255;
    g3 = s3>255;
    g4 = s4>255;
    g5 = s5>255;
    g6 = s6>255;
    g7 = s7>255;
    // initial propagate conditions
    p0 = s0==255;
    p1 = s1==255;
    p2 = s2==255;
    p3 = s3==255;
    p4 = s4==255;
    p5 = s5==255;
    p6 = s6==255;
    p7 = s7==255;
    // carry propagation prefix tree
    // up-level 1
    g1 = g0 & p1 | g1;
    p1 = p1 & p0;
    g3 = g2 & p3 | g3;
    p3 = p3 & p2;
    g5 = g4 & p5 | g5;
    p5 = p5 & p4;
    g7 = g6 & p7 | g7;
    p7 = p7 & p6;
    // up-level 2
    g3 = g1 & p3 | g3;
    p3 = p3 & p1;
    g7 = g5 & p7 | g7;
    p7 = p7 & p5;
    // up-level 3
    g7 = g3 & p7 | g7;
    p7 = p7 & p3;
    // down-level 5
    // down-level 6
    g5 = g3 & p5 | g5;
    p5 = p5 & p3;
    // down-level 7
    g2 = g1 & p2 | g2;
    p2 = p2 & p1;
    g4 = g3 & p4 | g4;
    p4 = p4 & p3;
    g6 = g5 & p6 | g6;
    p6 = p6 & p5;
    // compute final sum digits
    s0 = s0 % 256;
    s1 = (s1 + (nat) (g0&(bool)1)) % 256;
    s2 = (s2 + (nat) (g1&(bool)1)) % 256;
    s3 = (s3 + (nat) (g2&(bool)1)) % 256;
    s4 = (s4 + (nat) (g3&(bool)1)) % 256;
    s5 = (s5 + (nat) (g4&(bool)1)) % 256;
    s6 = (s6 + (nat) (g5&(bool)1)) % 256;
    s7 = (s7 + (nat) (g6&(bool)1)) % 256;
    s8 = (nat) (g7&(bool)1);
}