GCC needs additional option for compiling -fprofile-generate
http://stackoverflow.com/questions/1851299/is-it-possible-to-tell-the-branch-predictor-how-likely-it-is-to-follow-the-branch
And then those examples are working.
Oh, you can sun scons with arcs=gen or arcs=use, that will turn on
branch profile generation/usage. When I tried it, it made no difference
(long time ago), does it mean we need to use additional arguments to gcc
to make it really work? Thanks for the link, I will read it in train, it
looks interesting.
Cheers, v
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