What information does GCC Profile Guided Optimization (PGO) collect and which optimizations use it?

by

-fprofile-generate enables -fprofile-arcs, -fprofile-values and -fvpt.

-fprofile-use enables -fbranch-probabilities, -fvpt, -funroll-loops, -fpeel-loops and -ftracer

Source: http://gcc.gnu.org/onlinedocs/gcc-4.7.2/gcc/Optimize-Options.html#Optimize-Options

PS. Information about LTO also on that page.

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