[Bug tree-optimization/45301] New: [4.6 Regression] ICE: SIGSEGV in instantiate_scev_r (tree-scalar-evolution.c:3391) with -O2 -ftree-loop-distribution -fgraphite-identity

[Bug tree-optimization/45301] New: [4.6 Regression] ICE: SIGSEGV in instantiate_scev_r (tree-scalar-evolution.c:3391) with -O2 -ftree-loop-distribution -fgraphite-identity

[zsojka at seznam dot cz]

Command line:
$ gcc -O1 -ftree-loop-distribution -fgraphite-identity -fstrict-aliasing
-ftree-pre testcase.c
or
$ gcc -O2 -ftree-loop-distribution -fgraphite-identity testcase.c

Valgrind output:
==28123== Invalid read of size 8
==28123==    at 0x9210E1: instantiate_scev_r (tree-scalar-evolution.c:3391)
==28123==    by 0x9213C1: instantiate_scev_r (tree-scalar-evolution.c:2296)
==28123==    by 0x92217A: resolve_mixers (tree-scalar-evolution.c:2692)
==28123==    by 0x922378: analyze_scalar_evolution_in_loop
(tree-scalar-evolution.c:2039)
==28123==    by 0x922D2F: simple_iv (tree-scalar-evolution.c:3132)
==28123==    by 0x8C9114: dr_analyze_innermost (tree-data-ref.c:767)
==28123==    by 0x8C95C9: create_data_ref (tree-data-ref.c:964)
==28123==    by 0x8D0EDE: graphite_find_data_references_in_stmt
(tree-data-ref.c:4262)
==28123==    by 0xF412F9: scopdet_basic_block_info
(graphite-scop-detection.c:285)
==28123==    by 0xF41D6B: build_scops_1 (graphite-scop-detection.c:750)
==28123==    by 0xF418DB: scopdet_basic_block_info
(graphite-scop-detection.c:636)
==28123==    by 0xF41D6B: build_scops_1 (graphite-scop-detection.c:750)
==28123==  Address 0x10 is not stack'd, malloc'd or (recently) free'd
==28123== 
testcase.c: In function 'foo':
testcase.c:8:1: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

Tested revisions:
r163261 - crash
r162940 - OK


-- 
           Summary: [4.6 Regression] ICE: SIGSEGV in instantiate_scev_r
                    (tree-scalar-evolution.c:3391) with -O2 -ftree-loop-
                    distribution -fgraphite-identity
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: zsojka at seznam dot cz
  GCC host triplet: x86_64-pc-linux-gnu
GCC target triplet: x86_64-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45301

[Bug tree-optimization/45301] [4.6 Regression] ICE: SIGSEGV in instantiate_scev_r (tree-scalar-evolution.c:3391) with -O2 -ftree-loop-distribution -fgraphite-identity

[zsojka at seznam dot cz]

------- Comment #1 from zsojka at seznam dot cz  2010-08-17 00:48 -------
Created an attachment (id=21498)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=21498&action=view)
reduced testcase

$ gcc -O1 -ftree-loop-distribution -fgraphite-identity -fstrict-aliasing
-ftree-pre pr45301.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45301

[Bug tree-optimization/45301] [4.6 Regression] ICE: SIGSEGV in instantiate_scev_r (tree-scalar-evolution.c:3391) with -O2 -ftree-loop-distribution -fgraphite-identity

[rguenth at gcc dot gnu dot org]

-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.6.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45301

[Bug tree-optimization/45301] [4.6 Regression] ICE: SIGSEGV in instantiate_scev_r (tree-scalar-evolution.c:3391) with -O2 -ftree-loop-distribution -fgraphite-identity

[rguenth at gcc dot gnu dot org]

-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P1


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45301