[Issue 4721] compilation slow when compiling unittests on dcollections

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http://d.puremagic.com/issues/show_bug.cgi?id=4721



--- Comment #8 from Steven Schveighoffer <schveiguy at yahoo.com> 2010-08-26 06:22:33 PDT ---
This helps, but only reduces it to 20 seconds (but a 66% reduction is pretty
good!).  I ran another round of profiling, and found we have a new bottleneck:

Flat profile:

Each sample counts as 0.01 seconds.
  %   cumulative   self              self     total
 time   seconds   seconds    calls  ms/call  ms/call  name
 75.79      6.51     6.51     8103     0.80     0.80 
TemplateDeclaration::toJsonBuffer(OutBuffer*)
  3.14      6.78     0.27  1668093     0.00     0.00 
StructDeclaration::semantic(Scope*)
  2.10      6.96     0.18        1   180.00   180.00  do32bit(FL, evc*, int)
  1.98      7.13     0.17    15445     0.01     0.01 
EnumDeclaration::toJsonBuffer(OutBuffer*)
  0.70      7.19     0.06   656268     0.00     0.00 
Port::isSignallingNan(long double)
  0.47      7.23     0.04   915560     0.00     0.00 
StructDeclaration::toCBuffer(OutBuffer*, HdrGenState*)
  0.47      7.27     0.04                             Dsymbol::searchX(Loc,
Scope*, Identifier*)

This time, I question whether toJsonBuffer should be called at all, as I'm not
outputting any JSON data?

Walter, reopen if you think this could still use improvement.

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