[Bug middle-end/40106] Time increase with inlining for the Polyhedron test air.f90

[dominiq at lps dot ens dot fr]

------- Comment #2 from dominiq at lps dot ens dot fr  2009-05-12 13:23 -------
> decreasing --param hot-bb-frequency-fraction might help in this case.

I have tried --param hot-bb-frequency-fraction=1 (which seems the smallest
possible value, see pr40119), but it did not changed anything.

What I find very surprising is that the ~15% slow-down appears as soon as one
call is inlined, but without further slow-down with more inlining (I have
tested 4 and -fwhole-file inline 28 of them). If the block was misoptimized I
would expect a slow-down increasing with the number of inlined calls. Could the
problem be related to cache management instead (L1, since L2 is 4Mb on my
core2Duo)?


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40106