[Bug debug/43051] [4.5 Regression] VTA causes a stack living parameter unavailable in most of the function

["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  2010-02-22 17:10 -------
Created an attachment (id=19935)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=19935&action=view)
gcc45-pr43051.patch

Updated patch, which includes lxo's fix, guality testcase and also a fix for
infinite recursion discovered in redhat/gcc-4_4-branch backport.

While this bootstraps/regtests on the trunk, on redhat/gcc-4_4-branch bootstrap
fails due to endless alteration similar to PR42873 when compiling c-common.c
(add_tlist) during profiledbootstrap.  Haven't tried yet trunk
profiledbootstrap.  The alternation in this case is between:
(gdb) p debug_rtx (var1->var_part[0].loc_chain->next->loc)
(value/u:DI 90:90 @0x2a72678/0x28c5520)
$30 = void
(gdb) p debug_rtx (var1->var_part[0].loc_chain->loc)
(mem/f:DI (value/s/u:DI 56:56 @0x2a722c8/0x2904028) [161 S8 A64])
$31 = void
(gdb) p debug_rtx (var1->var_part[0].loc_chain->next->loc)
(value/u:DI 90:90 @0x2a72678/0x28c5520)
$32 = void
(gdb) p debug_rtx (var1->var_part[0].loc_chain->next->next->loc)
Cannot access memory at address 0x8
and
(gdb) p debug_rtx (var2->var_part[0].loc_chain->loc)
(mem/s/f:DI (value/s/u:DI 54:54 @0x2a722a8/0x2904078) [161 <variable>.next+0 S8
A64])
$33 = void
(gdb) p debug_rtx (var2->var_part[0].loc_chain->next->loc)
(mem/f:DI (value/s/u:DI 56:56 @0x2a722c8/0x2904028) [161 S8 A64])
$34 = void
(gdb) p debug_rtx (var2->var_part[0].loc_chain->next->next->loc)
(value/u:DI 90:90 @0x2a72678/0x28c5520)


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43051