Videos: Optimization

About optimizations that are performed when compiling C programs to machine code, and how programmers can perform optimizations by hand or cooperate with a compiler that performs optimizations.

• Optimization 1: Overview   7:00
  Overview what an optimizing compiler does and how a programmer can cooperate with an optimizer.

• Optimization 2: Generally useful optimizations   7:03
  Optimizations that can be performed by a compiler or a programmer and that are nearly always worthwhile.

• Optimization 3: Optimization 3: Procedure call as an optimization blocker   6:05
  When a compiler will assume nothing about a function and when it can take advantage of a function’s implementation in callers.

• Optimization 4: Aliasing as an optimization blocker   5:46
  How the possibility of aliased pointers can interfere with optimization and what to do about it.

• Optimization 5: gcc and strlen   5:59
  A curious case of optimization with gcc -O2 and strlen.

• Optimization 6: Vector example   9:24
  An extended example of performing optimizations by hand. You can run the code yourself.