GCC with profiile feedback?

晨想

Building with profile feedback
It is possible to use profile feedback to optimize the compiler itself. This should result in a faster compiler binary. Experiments done on x86 using gcc 3.3 showed approximately 7 percent speedup on compiling C programs. To bootstrap compiler with profile feedback, use make profiledbootstrap.

When `make profiledbootstrap' is run, it will first build a stage1 compiler. This compiler is used to build a stageprofile compiler instrumented to collect execution counts of instruction and branch probabilities. Then runtime libraries are compiled with profile collected. Finally a stagefeedback compiler is built using the information collected.

Unlike `make bootstrap' several additional restrictions apply. The compiler used to build stage1 needs to support a 64-bit integral type. It is recommended to only use GCC for this. Also parallel make is currently not supported since collisions in profile collecting may occur.


http://gcc.gnu.org/install/build.html