[Bug debug/33868] [4.3 Regression] Gross memory usage of var-tracking

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

------- Comment #2 from rguenth at gcc dot gnu dot org  2007-10-23 10:05 -------
We don't finish vt_find_locations () and have loads of variables allocated:

750       new_var = pool_alloc (var_pool);
(gdb) print *var_pool
$3 = {name = 0xf3d05a "variable_def pool", id = 22681, elts_per_block = 64, 
  returned_free_list = 0x0, virgin_free_list = 0x775c11d8 "", 
  virgin_elts_remaining = 40, elts_allocated = 3427264, elts_free = 40, 
  blocks_allocated = 53551, block_list = 0x775bead0, block_size = 26632, 
  elt_size = 416}
(gdb) print *loc_chain_pool
$9 = {name = 0xf3d06c "location_chain_def pool", id = 22682, 
  elts_per_block = 1024, returned_free_list = 0x0, 
  virgin_free_list = 0x7762ed48 "", virgin_elts_remaining = 803, 
  elts_allocated = 3735552, elts_free = 803, blocks_allocated = 3648, 
  block_list = 0x7762c3d0, block_size = 49160, elt_size = 48}

#0  unshare_variable (set=0x875ff48, var=0x7764d148, 
    initialized=VAR_INIT_STATUS_INITIALIZED)
    at /space/rguenther/src/svn/pointer_plus/gcc/var-tracking.c:750
#1  0x0000000000aeb75b in delete_variable_part (set=0x875ff48, 
    loc=0x2b5761fab440, decl=0x2b57662d1000, offset=0)
    at /space/rguenther/src/svn/pointer_plus/gcc/var-tracking.c:2592
#2  0x0000000000ae6e47 in var_reg_delete (set=0x875ff48, loc=0x2b576506c9c0, 
    clobber=1 '\001')
    at /space/rguenther/src/svn/pointer_plus/gcc/var-tracking.c:957
#3  0x0000000000aea150 in compute_bb_dataflow (bb=0x2b57616a7360)
    at /space/rguenther/src/svn/pointer_plus/gcc/var-tracking.c:2068
#4  0x0000000000aea48c in vt_find_locations ()


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33868