[Bug c++/24228] New: Segfault in chrec_contains_undetermined () at tree-chrec.c:871

[Bug c++/24228] New: Segfault in chrec_contains_undetermined () at tree-chrec.c:871

[uros at kss-loka dot si]

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Attached testcase segfaults when compiled with gcc version 4.1.0 20051006:

~/gcc-build/gcc/cc1plus -O3 -ftree-vectorize -fdump-tree-vect-all -quiet
-march=pentium4 express.ii
express.cpp: In function âvoid pov::Parse_Num_Factor(double*, int*)â:
express.cpp:1040: warning: converting to âintâ from âdoubleâ
express.cpp: In function âvoid pov::Parse_Num_Term(double*, int*)â:
express.cpp:1520: internal compiler error: Segmentation fault

Backtrace:

#4  0x0826c4fa in tree_complete_unroll () at tree-ssa-loop.c:376
#3  0x0828f1a7 in tree_unroll_loops_completely () at
tree-ssa-loop-ivcanon.c:381
#2  0x0828efb1 in canonicalize_loop_induction_variables () at
tree-ssa-loop-ivcanon.c:309
#1  0x0860faf7 in chrec_contains_undetermined () at tree-chrec.c:878
#0  0x0860f926 in chrec_contains_undetermined () at tree-chrec.c:871

This is the exact place of the segfault:

871 switch (TREE_CODE_LENGTH (TREE_CODE (chrec)))
872    {
873    case 3:

chrec value is 0xa5a5a5a5, which is rather suspicious.


-- 
           Summary: Segfault in chrec_contains_undetermined () at tree-
                    chrec.c:871
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: uros at kss-loka dot si
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24228

[Bug c++/24228] Segfault in chrec_contains_undetermined () at tree-chrec.c:871

[uros at kss-loka dot si]

------- Comment #1 from uros at kss-loka dot si  2005-10-06 09:14 -------
Created an attachment (id=9903)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=9903&action=view)
Preprocessed source

Compile this with ~/gcc-build/gcc/cc1plus -O3 -ftree-vectorize
-fdump-tree-vect-all -quiet -march=pentium4 express.ii

(Sorry for big testcase, but delta was not able to minimize it.)


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24228

[Bug tree-optimization/24228] Segfault in chrec_contains_undetermined () at tree-chrec.c:871

[pinskia at gcc dot gnu dot org]

------- Comment #2 from pinskia at gcc dot gnu dot org  2005-10-06 12:46 -------
This is a dup of bug 24049.  It is a GC issue with scev but it has been worked
around.

*** This bug has been marked as a duplicate of 24049 ***


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |DUPLICATE


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24228