[Bug tree-optimization/31976] [4.3 Regression] ICE in ssa_operand_alloc, at tree-ssa-operands.c:487 with -O3

["amacleod at redhat dot com" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #10 from amacleod at redhat dot com  2007-11-06 15:28 -------
Partitioning doesn't really seem to be the root problem.

looking at testcase-min.i:
There are about 820 SFTs associated with the giant structure, and we decide
that they *all* can be affected by the memory access and try to issue VOPS for
them.

An int is loaded via MEM[base: Hoopster_ptr_17, offset: 3552]. 
In get_tmr_operands(), we always call add_virtual_operands() with an offset of
0 and a size of -1. This seems wrong. we should be able to use the size of the
load and offset information to figure out the right SFT(s) to add. Instead,
because the size is -1, we simply include all of them.

Is this offset of 0 and size of -1 to paper over something else? I understand
there might be issues trying to get the right offset and base calculations
under some conditions...


-- 

amacleod at redhat dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2007-08-14 08:44:16         |2007-11-06 15:28:16
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31976