Analysis:Available Expressions An expression e is available at program point p if >e is computed on every path to p,and the value of e has not changed since the last time e was computed on every path to p Optimization If an expression is available,need not be recomputed -(At least,if it is still in a register somewhere) 14Analysis: Available Expressions  An expression e is available at program point p if ➢ e is computed on every path to p, and ➢ the value of e has not changed since the last time e was computed on every path to p  Optimization  If an expression is available, need not be recomputed  - (At least, if it is still in a register somewhere) 14