Loop Transformations--Unrolling, Jamming, Splitting, and Transposing

The compiler performs many loop optimizations that radically change the body of the loop. These include optimizations, unrolling, jamming, splitting, and transposing.

LoopTool and LoopReport attempt to provide hints that make as much sense as possible, but given the nature of the problem of associating optimized code with source code, the hints may be misleading.