(a) 
if(foo & 1)  bar = a;
else bar = b;

(b) 
bar = (foo & 1) ? a : b;

(c) 
bar = b + (a - b)*(foo & 1);

(d) 
/* -(foo & 1) is either all zeros or all ones */
bar = b + ((a - b) & -(foo & 1));

Example 4: (a) Conditional that requires two branch instructions; (b) a less-obvious conditional; (c) using arithmetic to avoid branches; (d) using logical operations to avoid branches.