[Bug c/41203] New: -mtune=pentium2 structure related tree-outof-ssa internal compiler error

["dps at simpson dot demon dot co dot uk" <gcc-bugzilla at gcc dot gnu dot org>]

There seems to be a tree-ssa related structure member assignment problem that
affects  gcc -m32  -{O,O2,O3,Os} -mtune=pentium2  but apparently nothing else.

Removing the if statement out of the set_foo function also avoids the bug.

Screen shot:
$ gcc --version
gcc (GCC) 4.5.0 20090809 (experimental)
<... all the rest eldided...>
$ gcc -Os -m32 -march=i686 -mtune=pentium2 -c -o block/blk-settings.o
/tmp/blk-settings2.c
/tmp/blk-settings2.c: In function 'set_foo':
/tmp/blk-settings2.c:9:6: internal compiler error: in
insert_value_copy_on_edge, at tree-outof-ssa.c:223
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

Code:
/* insert_value_copy_on_edge, at tree-outof-ssa.c:223
 * gcc (GCC) 4.5.0 20090809 (experimental)
 * platform x86_64-unknown-linux-gnu */
struct foo
{
    unsigned short foo;
};

void set_foo(struct foo *p, unsigned short bar)
{
    if (!bar)
        bar = 1;
    p->foo = bar;
}


-- 
           Summary: -mtune=pentium2 structure related tree-outof-ssa
                    internal compiler error
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: dps at simpson dot demon dot co dot uk
 GCC build triplet: x86_64-unknown-linux-gnu
  GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: i686-unknown-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41203