9.7.4 Dump output verbosity

The dump verbosity has the following options

`optimized'

Print information when an optimization is successfully applied. It is up to a pass to decide which information is relevant. For example, the vectorizer passes print the source location of loops which got successfully vectorized.

`missed'

Print information about missed optimizations. Individual passes control which information to include in the output. For example,

          gcc -O2 -ftree-vectorize -fopt-info-vec-missed
     

will print information about missed optimization opportunities from vectorization passes on stderr.

`note'

Print verbose information about optimizations, such as certain transformations, more detailed messages about decisions etc.

`all'

Print detailed optimization information. This includes optimized, missed, and note.