GNU Compiler Collection (GCC) Internals: Dump output verbosity

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#### 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.