[Bug tree-optimization/45950] New: [4.6 Regression} ICE segmentation fault compiling __udivdi3

[danglin at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45950

           Summary: [4.6 Regression} ICE segmentation fault compiling
                    __udivdi3
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: danglin@gcc.gnu.org
              Host: hppa*-*-* (32-bit)
            Target: hppa*-*-* (32-bit)
             Build: hppa*-*-* (32-bit)


/test/gnu/gcc/objdir/./gcc/xgcc -B/test/gnu/gcc/objdir/./gcc/
-B/opt/gnu/gcc/gcc-4.6.0/hppa2.0w-hp-hpux11.11/bin/
-B/opt/gnu/gcc/gcc-4.6.0/hppa2.0w-hp-hpux11.11/lib/ -isystem
/opt/gnu/gcc/gcc-4.6.0/hppa2.0w-hp-hpux11.11/include -isystem
/opt/gnu/gcc/gcc-4.6.0/hppa2.0w-hp-hpux11.11/sys-include    -g -O2 -O2  -g -O2
-DIN_GCC   -W -Wall -Wwrite-strings -Wcast-qual -Wstrict-prototypes
-Wmissing-prototypes -Wold-style-definition  -isystem ./include  -fPIC
-frandom-seed=fixed-seed -g -DHAVE_GTHR_DEFAULT -DIN_LIBGCC2
-D__GCC_FLOAT_NOT_NEEDED   -I. -I. -I../.././gcc -I../../../gcc/libgcc
-I../../../gcc/libgcc/. -I../../../gcc/libgcc/../gcc
-I../../../gcc/libgcc/../include  -DHAVE_CC_TLS -DUSE_EMUTLS -o _udivdi3.o -MT
_udivdi3.o -MD -MP -MF _udivdi3.dep -DL_udivdi3 -c
../../../gcc/libgcc/../gcc/libgcc2.c \
          -fexceptions -fnon-call-exceptions
../../../gcc/libgcc/../gcc/libgcc2.c: In function '__udivdi3':
../../../gcc/libgcc/../gcc/libgcc2.c:1134:1: internal compiler error:
Segmentati
on fault

Introduced by the following change:

2010-10-08  Nathan Froyd  <froydnj@codesourcery.com>

        * tree-ssa-sccvn.c (init_vn_nary_op_from_pieces): New function.
        (init_vn_nary_op_from_op): New function.
        (init_vn_nary_op_from_stmt): New function.
        (vn_nary_op_lookup_1): New function.
        (sizeof_vn_nary_op): New function.
        (alloc_vn_nary_op_noinit): New function.
        (alloc_vn_nary_op): New function.
        (vn_nary_op_insert_into): New function.
        (vn_nary_op_lookup_pieces): Rewrite to use new helper functions.
        (vn_nary_op_lookup): Likewise.
        (vn_nary_op_lookup_stmt): Likewise.
        (vn_nary_op_insert_pieces): Likewise.
        (vn_nary_op_insert): Likewise.
        (vn_nary_op_insert_stmt): Likewise.
        (copy_nary): Likewise.
        (set_value_id_for_result): New function.
        (set_hashtable_value_ids): Call it.

Program received signal SIGSEGV, Segmentation fault.
0x00037ff4 in $$dyncall ()
(gdb) bt
#0  0x00037ff4 in $$dyncall ()
#1  0x03a80060 in htab_find_slot (htab=0x40122b58, element=0x7eff14f4, 
    insert=NO_INSERT) at ../../gcc/libiberty/hashtab.c:712
#2  0x02ad98c4 in lookup_expression_id (expr=0x7eff14f4)
    at ../../gcc/gcc/tree-ssa-pre.c:292
#3  0x02adc658 in get_or_alloc_expr_for_constant (constant=0x7af2a738)
    at ../../gcc/gcc/tree-ssa-pre.c:1067
#4  0x02adcd18 in fully_constant_expression (e=0x40140088)
    at ../../gcc/gcc/tree-ssa-pre.c:1225
#5  0x02adda6c in phi_translate_1 (expr=0x40140088, set1=0x401464d0, 
    set2=0x0, pred=0x7ad4a990, phiblock=0x7ad62750)
    at ../../gcc/gcc/tree-ssa-pre.c:1529
#6  0x02adeb54 in phi_translate (expr=0x4013ffc8, set1=0x401464d0, set2=0x0, 
    pred=0x7ad4a990, phiblock=0x7ad62750) at ../../gcc/gcc/tree-ssa-pre.c:1858
#7  0x02adec28 in phi_translate_set (dest=0x401464f8, set=0x401464d0, 
    pred=0x7ad4a990, phiblock=0x7ad62750) at ../../gcc/gcc/tree-ssa-pre.c:1892
#8  0x02adfa60 in defer_or_phi_translate_block (dest=0x401464f8, 
    source=0x401464d0, block=0x7ad4a990, phiblock=0x7ad62750)
    at ../../gcc/gcc/tree-ssa-pre.c:2237
#9  0x02adfb64 in compute_antic_aux (block=0x7ad4a990, 
    block_has_abnormal_pred_edge=0 '\000')
    at ../../gcc/gcc/tree-ssa-pre.c:2298
#10 0x02ae0ed4 in compute_antic () at ../../gcc/gcc/tree-ssa-pre.c:2604
#11 0x02ae8c6c in execute_pre (do_fre=0 '\000')
    at ../../gcc/gcc/tree-ssa-pre.c:4833
#12 0x02ae8e40 in do_pre () at ../../gcc/gcc/tree-ssa-pre.c:4868
#13 0x00ca6da0 in execute_one_pass (pass=0x40024168)
    at ../../gcc/gcc/passes.c:1562
#14 0x00ca7098 in execute_pass_list (pass=0x40024168)
    at ../../gcc/gcc/passes.c:1617
#15 0x00ca70bc in execute_pass_list (pass=0x40023748)
    at ../../gcc/gcc/passes.c:1618
#16 0x02548734 in tree_rest_of_compilation (fndecl=0x7ae68980)
    at ../../gcc/gcc/tree-optimize.c:419
#17 0x013ed6b0 in cgraph_expand_function (node=0x7aef4680)
    at ../../gcc/gcc/cgraphunit.c:1498
#18 0x013ed944 in cgraph_expand_all_functions ()
    at ../../gcc/gcc/cgraphunit.c:1557
#19 0x013ee374 in cgraph_optimize () at ../../gcc/gcc/cgraphunit.c:1813
#20 0x013eb62c in cgraph_finalize_compilation_unit ()
    at ../../gcc/gcc/cgraphunit.c:1020
#21 0x000c262c in c_write_global_declarations ()
    at ../../gcc/gcc/c-decl.c:9821
#22 0x00e2c434 in compile_file () at ../../gcc/gcc/toplev.c:946
#23 0x00e30508 in do_compile () at ../../gcc/gcc/toplev.c:2374
#24 0x00e30694 in toplev_main (argc=74, argv=0x7eff0854)
    at ../../gcc/gcc/toplev.c:2415
#25 0x00373f34 in main (argc=74, argv=0x7eff0854) at ../../gcc/gcc/main.c:36
(gdb) frame 2
#2  0x02ad98c4 in lookup_expression_id (expr=0x7eff14f4)
    at ../../gcc/gcc/tree-ssa-pre.c:292
292          slot = htab_find_slot (expression_to_id, expr, NO_INSERT);
(gdb) p debug_tree (expr)
 <error_mark 7eff14f4>
$1 = void
(gdb) frame 3
#3  0x02adc658 in get_or_alloc_expr_for_constant (constant=0x7af2a738)
    at ../../gcc/gcc/tree-ssa-pre.c:1067
1067      result_id = lookup_expression_id (&expr);
(gdb) p debug_tree (constant)
 <integer_cst 7af2a738 type <integer_type 7af372a0 int> constant 0>
$2 = void