Cross-class inlining

Thu Oct 23 05:15:00 GMT 2003

> > Still, the "all in 1" approach gets a 49% speedup over just -O3 on
> > individual modules, and 17% better than I could do by hand.
>> Cool.
>
Actually that was a bit premature - must have been tired. What I was seeing was a 17% improvement over the hand-inlined source. Compiling the unoptimized source all on the one command line actually only gets a 12% improvement.
So: next question - is there any way to manually direct the inlining ? I've tried playing with various values of -finline-limit, but can't get better than this.
JikesRVM has an "exception pragma" idiom to direct the inliner, ie if a method throws VM_PragmaInline, then it gets inlined by the optimizing compiler. It would seem that in this case at least I can make a better judgement than the compiler as to what should be inlined.
tia,
Robin
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