Hello,
> Dear mailing list,
>
> is there something wrong with the following code?
> --
> basic_block my_basic_block;
> basic_block dup_basic_block;
>
> FOR_EACH_BB(my_basic_block)
> {
> dup_basic_block = duplicate_block(bb, NULL);
> }
I assume you mean
> dup_basic_block = duplicate_block(my_basic_block, NULL);
Then, this code is quite likely to cause an infinite loop, duplicating
also the newly created basic blocks. I however have no idea how this
could cause the ICE you describe below.
Zdenek
> --
> I get an ICE in get_indirect_ref_operands, with the backtrace:
> --
> #0 0x0000000100175688 in get_indirect_ref_operands
> (stmt=0xffffffff7ea0c640, expr=0xffffffff7eaf8100, flags=0)
> at ../../gcc-4.0.1/gcc/tree-ssa-operands.c:1417
> #1 0x0000000100173dcc in get_expr_operands (stmt=0xffffffff7ea0c640,
> expr_p=0xffffffff7ea0c3f8, flags=0)
> at ../../gcc-4.0.1/gcc/tree-ssa-operands.c:1091
> #2 0x000000010017406c in get_expr_operands (stmt=0xffffffff7ea0c640,
> expr_p=0xffffffff7ea0c680, flags=0)
> at ../../gcc-4.0.1/gcc/tree-ssa-operands.c:1134
> #3 0x0000000100172f94 in build_ssa_operands
> (stmt=0xffffffff7ea0c640, ann=0xffffffff7eaf6850,
> old_ops=0xffffffff7fffcd90,
> new_ops=0xffffffff7eaf6878) at ../../gcc-4.0.1/gcc/tree-ssa-
> operands.c:906
> #4 0x0000000100173b20 in get_stmt_operands (stmt=0xffffffff7ea0c640)
> at ../../gcc-4.0.1/gcc/tree-ssa-operands.c:1021
> #5 0x000000010010ca18 in tree_duplicate_bb (bb=0xffffffff7eafbe10)
> at ../../gcc-4.0.1/gcc/tree-cfg.c:4684
> #6 0x0000000100591ea8 in duplicate_block (bb=0xffffffff7eafbe10,
> e=0x0) at ../../gcc-4.0.1/gcc/cfghooks.c:717
> ...
> --
> The context is a tree optimization pass, with PROP_gimple_any |
> PROP_ssa | PROP_cfg | PROP_referenced_vars required.
>
> Sincerely,
> Sean Callanan
