xor.c

wrote_R0:
if (A == 0) {
  T0 = !T0;             // 自動ターンアウトレールなのでトグルする
  if (T0 == 1) {        // 1回目
    R0 = 0; goto wrote_R0;
  } else {              // 2回目
    R1 = 0; goto wrote_R1;
  }
} else {
  T1 = !T1;
  if (T1 == 1) {         // 1回目
    R0 = 1; goto wrote_R0;
  } else {               // 2回目
    R1 = 1; goto wrote_R1;
  }
}
wrote_R1: 
if (B == 0) {
  if (R0 == 0) { // A == 0, B == 0
    X = 0; goto wrote_X;
  } else {       // A == 1, B == 0
    X = 1; goto wrote_X;
  }
} else {
  if (R1 == 0) { // A == 0, B == 1
    X = 1; goto wrote_X;
  } else {       // A == 1, B == 1
    X = 0; goto wrote_X;
  }
}
wrote_X: ;