[Bug tree-optimization/79315] [7 Regression] ICE while building SPEC CPU 2006 FP with -Ofast -ftree-parallelize-loops

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79315

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
The bogus location is on &__builtin_powf in

_224 = __builtin_powf (_38, 1.809999942779541015625e+0);

in wsm32d.  It gets the location via

#1  0x0000000000ff33a5 in move_stmt_op (tp=0x7ffff66b3a90, 
    walk_subtrees=0x7fffffffd338, data=0x7fffffffd550)
    at /space/rguenther/src/svn/gcc-7-branch/gcc/tree-cfg.c:6642
6642            TREE_SET_BLOCK (t, p->new_block);
...
#5  0x0000000000ff3ed7 in move_block_to_fn (dest_cfun=0x7ffff6a88160, 
    bb=<basic_block 0x7ffff66f2618 (32)>, 
    after=<basic_block 0x7ffff68ab4e0 (8)>, update_edge_count_p=true, 
    d=0x7fffffffd6e0)
    at /space/rguenther/src/svn/gcc-7-branch/gcc/tree-cfg.c:6922
#6  0x0000000000ff5783 in move_sese_region_to_fn (dest_cfun=0x7ffff6a88160, 

(gdb) l
6637        {
6638          tree block = TREE_BLOCK (t);
6639          if (block == p->orig_block
6640              || (p->orig_block == NULL_TREE
6641                  && block != NULL_TREE))
6642            TREE_SET_BLOCK (t, p->new_block);
6643          else if (flag_checking && block != NULL_TREE)
6644            {
6645              while (block && TREE_CODE (block) == BLOCK && block !=
p->orig_block)
6646                block = BLOCK_SUPERCONTEXT (block);
(gdb) p p->orig_bock
There is no member named orig_bock.
(gdb) p p->orig_block
$18 = <tree 0x0>
(gdb) p block
$19 = <tree 0x0>
(gdb) p p->new_block
$20 = <block 0x7ffff6a94840>

probably not a good idea to simply set TREE_BLOCK on a tree node that can
be shared... (from a NULL TREE_BLOCK even).