[Bug debug/37022] [4.4 regression] internal compiler error: in compute_barrier_args_size

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

------- Comment #7 from jakub at gcc dot gnu dot org  2008-08-11 12:09 -------
Sorry, I can't reproduce the first issue with a x86_64-linux -> i?86-darwin
cross on the provided preprocessed testcase, tried many different
-march=/-mtune=
options as well as -f{,no-}asynchronous-unwind-tables.  What tuning do you use?
 What preferred stack size?

The later C testcase I can reproduce, but here the testcase has a frame pointer
(insn/f 38 37 39 pr37022.c:4 (set (reg/f:SI 6 bp)
        (reg/f:SI 7 sp)) 47 {*movsi_1} (nil))
so I must say I don't understand at all why we generate any
DW_CFA_GNU_args_size
directives.  I believe the unwinder won't use them anyway, as in
uw_install_context_1
if (!_Unwind_GetGRPtr (current, __builtin_dwarf_sp_column ()))
the condition is false (sp is saved in bp).  For the -fno-a-u-t we check
cfa.reg:
if (!flag_asynchronous_unwind_tables && cfa.reg != STACK_POINTER_REGNUM)
but not so for the -fa-u-t case.


-- 

jakub at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jason at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37022