[llvm-commits] Trampoline changes

Nick Lewycky nicholas at mxc.ca
Sat Sep 8 15:59:08 PDT 2007

Duncan Sands wrote:
> It is easy to construct testcases for which this works, but sadly I was unable to get
> the optimization to occur even once in a trampoline heavy real-world program without
> jacking-up the inlining limit hugely (to 100000; 10000 wasn't enough).  Still, I'm
> hoping that it may sometimes be useful.

Why does changing the inliner threshold help? Are you talking about 
inlining the trampoline itself or the llvm.init.trampoline intrinsic? 
Could we adjust the weights in the inliner so that it does it more 
often, seeing as a trampoline call is much more expensive than a regular 

Would you mind sending a small before and after example for the 
transformation implemented by your instcombine patch?

Nick Lewycky

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