[Bug bootstrap/62009] Bootstrap failure in vec.h::splice

["jgreenhalgh at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62009

jgreenhalgh at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|i686                        |i686,
                   |                            |arm-none-linux-gnueabihf
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-08-04
                 CC|                            |jgreenhalgh at gcc dot gnu.org
            Summary|Bootstrap failure on i686   |Bootstrap failure in
                   |                            |vec.h::splice
     Ever confirmed|0                           |1

--- Comment #1 from jgreenhalgh at gcc dot gnu.org ---
I saw something very similar on ARM, but I couldn't reproduce it across two
other bootstraps with the same configuration, nor did I see the ICE when trying
to resume the build by typing "make".

.../configure --with-cpu=cortex-a9 --with-fpu=neon-fp16 --with-mode=thumb
--with-float=hard --enable-languages=c,c++,fortran

/work/jamgre01//gcc-src/gcc/tree-ssa-pre.c: In function âpre_expr_d*
bitmap_find_leader(bitmap_set_t, unsigned int)â:
/work/jamgre01//gcc-src/gcc/tree-ssa-pre.c:1837:1: internal compiler error: in
splice, at vec.h:844
 bitmap_find_leader (bitmap_set_t set, unsigned int val)
 ^
0xaa2927 vec<_edge_var_map, va_heap, vl_embed>::splice(vec<_edge_var_map,
va_heap, vl_embed>&)
    /work/jamgre01//gcc-src/gcc/vec.h:844
0xaa253d vec<_edge_var_map, va_heap, vl_ptr>::splice(vec<_edge_var_map,
va_heap, vl_ptr>&)
    /work/jamgre01//gcc-src/gcc/vec.h:1495
0xaa1fab vec<_edge_var_map, va_heap, vl_ptr>::safe_splice(vec<_edge_var_map,
va_heap, vl_ptr>&)
    /work/jamgre01//gcc-src/gcc/vec.h:1512
0xa9ddbb redirect_edge_var_map_dup(edge_def*, edge_def*)
    /work/jamgre01//gcc-src/gcc/tree-ssa.c:113
0x4d8bfd redirect_edge_succ_nodup(edge_def*, basic_block_def*)
    /work/jamgre01//gcc-src/gcc/cfghooks.c:437
0xa9dee5 ssa_redirect_edge(edge_def*, basic_block_def*)
    /work/jamgre01//gcc-src/gcc/tree-ssa.c:173
0x8fd663 gimple_try_redirect_by_replacing_jump
    /work/jamgre01//gcc-src/gcc/tree-cfg.c:5419
0x8fd6e7 gimple_redirect_edge_and_branch
    /work/jamgre01//gcc-src/gcc/tree-cfg.c:5450
0x4d89d5 redirect_edge_and_branch(edge_def*, basic_block_def*)
    /work/jamgre01//gcc-src/gcc/cfghooks.c:356
0x907a79 remove_forwarder_block
    /work/jamgre01//gcc-src/gcc/tree-cfgcleanup.c:445
0x9080a7 cleanup_tree_cfg_bb
    /work/jamgre01//gcc-src/gcc/tree-cfgcleanup.c:633
0x90818d cleanup_tree_cfg_1
    /work/jamgre01//gcc-src/gcc/tree-cfgcleanup.c:675
0x9082cb cleanup_tree_cfg_noloop
    /work/jamgre01//gcc-src/gcc/tree-cfgcleanup.c:731
0x9083bd cleanup_tree_cfg()
    /work/jamgre01//gcc-src/gcc/tree-cfgcleanup.c:786
0x90897f execute_cleanup_cfg_post_optimizing
    /work/jamgre01//gcc-src/gcc/tree-cfgcleanup.c:1081
0x908b29 execute
    /work/jamgre01//gcc-src/gcc/tree-cfgcleanup.c:1143
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