> Yes. This means it's easy to experiment with other values than zero. > Basically > early inlining is supposed to remove abstraction penalty to > > a) reduce FDO instrumentation overhead > b) get more realistic size estimates for the inliner > > a) was particularly important back in time for tramp3d, reducing > profiling runtime > 1000-fold. b) is generally important. > > PARAM_EARLY_INLINING_INSNS is supposed to be a reasonable value to > get abstraction removed but IIRC we increased it quite a bit to also get more > early optimization (to get more accurate inliner estimates). > > What I am saying is that reducing PARAM_EARLY_INLINING_INSNS makes > sense for FDO but reducing it to zero is probably a bit much. > > Can you do your measurements with values between zero and the current > default of 14 (wow, 14 ... didn't know it's _that_ high currently ;)). > What's the > value that crosses the boundary of diminishing returns regarding to code-size > improvements for you? > > Richard. >
I see. This procedure may take some time since profile data can not be reused. Yuan, Pengfei
