http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50127
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |ASSIGNED
AssignedTo|unassigned at gcc dot |jakub at gcc dot gnu.org
|gnu.org |
--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-01-06
13:00:28 UTC ---
Created attachment 26256
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26256
gcc47-pr50127.patch
Untested fix.
The problem was that partition_hot_cold_basic_blocks was leaving garbage in
some bb->aux fields, but subsequent optimization passes and/or df_analyze here
assume that each pass cleans that up after itself. DF was storing age in
bb->aux as ptrdiff_t values, and when some bb->aux contained pointer to another
bb, if it was in the upper half of address space (for 32-bit hosts), it was
treated as negative age, while if in the lower half of AS (for 64-bit hosts),
it was just assumed to be very huge age.
