[LLVMdev] Recursion inlining

[Pablo Barrio]

Hi all,

 

The default inliner currently marks all recursive functions as "never"
inline when calculating the cost (CallAnalyzer::analyzeCall() in
lib/Analysis/IPA/InlineCost.cpp). Is there any reason for this? Did anyone
try to implement recursion inlining in the past and failed? Or succeeded,
but it was dropped later on? All I found was a thread from a few years ago:

 

http://lists.cs.uiuc.edu/pipermail/llvmdev/2011-October/043732.html

 

I would expect some performance benefits in recursion inlining, obviously at
the cost of code size increase. However, the heuristics could be tuned up so
as to get a reasonable size/performance tradeoff. 

 

Many thanks,
Pablo

 
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