[Bug c++/55135] [4.8 Regression] Segfault of gcc on a big file

steven at gcc dot gnu.org gcc-bugzilla@gcc.gnu.org
Fri Mar 1 21:05:00 GMT 2013


--- Comment #20 from Steven Bosscher <steven at gcc dot gnu.org> 2013-03-01 21:05:00 UTC ---
(In reply to comment #15)
> Trading memory O(number of pseudos) with a large constant factor sounds
> like something waiting for trouble for other testcases ...

FWIW, for  this particular test case, almost all registers end up in
the set. I'm not sure why.  And since there are NUM_MACHINE_MODES bits
per register (NUM_MACHINE_MODES==87 on x86) the supposed-to-be sparse
bitmaps are huge (>100,000 bitmap_elements).

I have a fix proper for this problem in testing.

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