InlineSmallCode is too low by default

Ulf Zibis Ulf.Zibis at
Mon Apr 23 17:20:41 PDT 2012

I think, inline heuristic should not only measure the code size, but additionally count, how many 
callsites would be affected.
E.g. 2 times inlining 200 bytes should be preferred over 10 times inlining 100 bytes.


Am 23.04.2012 23:29, schrieb Coleen Phillimore:
> I'm resending this to the compiler development alias.
> Coleen
> On 4/23/2012 12:50 PM, Rémi Forax wrote:
>> InlineSmallCode is set to 1000 on x86 by default if tiered mode
>> is not enabled and 2000 if tiered mode is enabled.
>> I wonder if there is a reason for that inconsistency.
>> InlineSmallCode is the threshold used by the inlining heuristic
>> to know if a method is too big or not to be inlined multiple times,
>> on my dynamic language runtime, setting it to 2000 is very important
>> because otherwise most of the high order functions (function that
>> takes a function as argument) are not compiled with their callsite
>> so escape analysis can't work.
>> I suppose it's also the case for users that use libraries like
>> Google guava or Goldman Sachs's gs-collection that exhibit the same patterns.
>> that why I propose to bump InlineSmallCode to 2000 for x86 and
>> 2500 for sparc by default (the defaults in tiered mode).
>> Rémi

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