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* [Bug middle-end/46924] New: [4.6 Regression] ICE: SIGSEGV in rewrite_commutative_reductions_out_of_ssa_loop (graphite-poly.h:450) with -fgraphite-identity -ffast-math -fno-tree-loop-im
@ 2010-12-13 16:15 zsojka at seznam dot cz
  2010-12-15  3:49 ` [Bug middle-end/46924] " hjl.tools at gmail dot com
                   ` (3 more replies)
  0 siblings, 4 replies; 5+ messages in thread
From: zsojka at seznam dot cz @ 2010-12-13 16:15 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46924

           Summary: [4.6 Regression] ICE: SIGSEGV in
                    rewrite_commutative_reductions_out_of_ssa_loop
                    (graphite-poly.h:450) with -fgraphite-identity
                    -ffast-math -fno-tree-loop-im
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: zsojka@seznam.cz
                CC: spop@gcc.gnu.org
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu


Created attachment 22744
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22744
reduced testcase (from gcc.dg/graphite/id-14.c)

Compiler output:
$ gcc -O -fgraphite-identity -ffast-math -fno-tree-loop-im pr46924.c
==29600== Invalid read of size 8
==29600==    at 0xFDCB06: rewrite_commutative_reductions_out_of_ssa_loop
(graphite-poly.h:450)
==29600==    by 0xFE3F1E: build_poly_scop (graphite-sese-to-poly.c:3068)
==29600==    by 0xFCB4F4: graphite_transform_loops (graphite.c:282)
==29600==    by 0x9B20C6: graphite_transforms (tree-ssa-loop.c:296)
==29600==    by 0x7EC65E: execute_one_pass (passes.c:1553)
==29600==    by 0x7EC924: execute_pass_list (passes.c:1608)
==29600==    by 0x7EC936: execute_pass_list (passes.c:1609)
==29600==    by 0x7EC936: execute_pass_list (passes.c:1609)
==29600==    by 0x7EC936: execute_pass_list (passes.c:1609)
==29600==    by 0x92CEF5: tree_rest_of_compilation (tree-optimize.c:422)
==29600==    by 0xAF2721: cgraph_expand_function (cgraphunit.c:1508)
==29600==    by 0xAF4CF9: cgraph_optimize (cgraphunit.c:1567)
==29600==  Address 0x8 is not stack'd, malloc'd or (recently) free'd
==29600== 
pr46924.c: In function 'foo':
pr46924.c:7:7: 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.

GDB backtrace:
split_reduction_stmt (scop=0x17c36f0, loop=<value optimized out>)
    at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/graphite-sese-to-poly.c:2644
2644      poly_bb_p pbb = pbb_from_bb (bb);
(gdb) bt
#0  split_reduction_stmt (scop=0x17c36f0, loop=<value optimized out>)
    at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/graphite-sese-to-poly.c:2644
#1  translate_scalar_reduction_to_array (scop=0x17c36f0, loop=<value optimized
out>)
    at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/graphite-sese-to-poly.c:2984
#2  rewrite_commutative_reductions_out_of_ssa_close_phi (scop=0x17c36f0,
loop=<value optimized out>)
    at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/graphite-sese-to-poly.c:3024
#3  rewrite_commutative_reductions_out_of_ssa_loop (scop=0x17c36f0, loop=<value
optimized out>)
    at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/graphite-sese-to-poly.c:3051
#4  0x0000000000fe3f1f in rewrite_commutative_reductions_out_of_ssa
(scop=0x17c36f0)
    at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/graphite-sese-to-poly.c:3068
#5  build_poly_scop (scop=0x17c36f0) at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/graphite-sese-to-poly.c:3155
#6  0x0000000000fcb4f5 in graphite_transform_loops () at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/graphite.c:282
#7  0x00000000009b20c7 in graphite_transforms () at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/tree-ssa-loop.c:296
#8  0x00000000007ec65f in execute_one_pass (pass=0x16368a0) at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/passes.c:1553
#9  0x00000000007ec925 in execute_pass_list (pass=0x16368a0) at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/passes.c:1608
#10 0x00000000007ec937 in execute_pass_list (pass=0x1636900) at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/passes.c:1609
#11 0x00000000007ec937 in execute_pass_list (pass=0x1636ba0) at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/passes.c:1609
#12 0x00000000007ec937 in execute_pass_list (pass=0x1635d60) at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/passes.c:1609
#13 0x000000000092cef6 in tree_rest_of_compilation (fndecl=0x7ffff5cc4f00)
    at /usr/portage/distfiles/svn-src/gcc/trunk/gcc/tree-optimize.c:422
#14 0x0000000000af2722 in cgraph_expand_function (node=0x7ffff5ce4000)
    at /usr/portage/distfiles/svn-src/gcc/trunk/gcc/cgraphunit.c:1508
#15 0x0000000000af4cfa in cgraph_expand_all_functions () at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/cgraphunit.c:1567
#16 cgraph_optimize () at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/cgraphunit.c:1827
#17 0x0000000000af527a in cgraph_finalize_compilation_unit ()
    at /usr/portage/distfiles/svn-src/gcc/trunk/gcc/cgraphunit.c:1031
#18 0x0000000000508cdc in c_write_global_declarations () at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/c-decl.c:9845
#19 0x00000000008d6776 in compile_file (argc=16, argv=0x7fffffffda98)
    at /usr/portage/distfiles/svn-src/gcc/trunk/gcc/toplev.c:591
#20 do_compile (argc=16, argv=0x7fffffffda98) at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/toplev.c:1874
#21 toplev_main (argc=16, argv=0x7fffffffda98) at
/usr/portage/distfiles/svn-src/gcc/trunk/gcc/toplev.c:1937
#22 0x00007ffff6586bbd in __libc_start_main () from /lib/libc.so.6
#23 0x00000000004ef6b9 in _start ()

Tested revisions:
r167723 - crash
r167585 - crash
r165699 - OK
4.5 r166509 - OK


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2010-12-13 16:15 [Bug middle-end/46924] New: [4.6 Regression] ICE: SIGSEGV in rewrite_commutative_reductions_out_of_ssa_loop (graphite-poly.h:450) with -fgraphite-identity -ffast-math -fno-tree-loop-im zsojka at seznam dot cz
2010-12-15  3:49 ` [Bug middle-end/46924] " hjl.tools at gmail dot com
2010-12-16 21:18 ` spop at gcc dot gnu.org
2010-12-16 22:54 ` spop at gcc dot gnu.org
2010-12-16 22:55 ` spop at gcc dot gnu.org

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