137 Features  section in The Loop Vectorizer
143 Loops with unknown trip count
160 Runtime Checks of Pointers
182 Reductions
203 Inductions
216 If Conversion
234 Pointer Induction Variables
248 Reverse Iterators
260 Scatter / Gather
276 Vectorization of Mixed Types
290 Global Structures Alias Analysis
309 Vectorization of function calls
341 Partial unrolling during vectorization