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Subject: [Bug tree-optimization/46985] [4.4/4.5/4.6 Regression] ICE: SIGSEGV in is_gimple_min_invariant (gimple.c:2742) with -fno-tree-ccp -fno-tree-dominator-opts -fno-tree-fre
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46985

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2010.12.17 12:05:09
                 CC|                            |jakub at gcc dot gnu.org,
                   |                            |spop at gcc dot gnu.org
     Ever Confirmed|0                           |1

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> 2010-12-17 12:05:09 UTC ---
instantiate_scev_r is called on:
{&tar[ptr$dim$0$lbound_81 + -1].i, +, 4}_3
and the problem is with that COMPONENT_REF inside of it.  COMPONENT_REF has 3
operands, but the last one is optional (there are lots of other trees like
that),
but instantiate_scev_r/instantiate_scev_[123] assume all operands must be
non-NULL.

So, one possible fix would be to:
   if (automatically_generated_chrec_p (chrec)
+      || chrec == NULL
       || is_gimple_min_invariant (chrec))
     return chrec;
at the beginning of instantiate_scev_r.  Or maybe it is just wrong to call
instantiate_scev_r with such arguments and the bug is earlier.