[Bug tree-optimization/40351] [4.5 Regression] ice in generate_subtree_copies for Linux kernel build

["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  2009-06-05 11:40 -------
Reduced testcase, fails with -O.

struct IO_APIC_route_entry {
    unsigned int vector : 8;
    unsigned int delivery_mode : 1;
    unsigned int mask : 1;
    unsigned int __reserved_2 : 15;
    unsigned int __reserved_3 : 8;
} __attribute__ ((packed));
union entry_union {
    struct {
        unsigned int w1, w2;
    };
    struct IO_APIC_route_entry entry;
};
unsigned int io_apic_read(void);
struct IO_APIC_route_entry ioapic_read_entry(void)
{
  union entry_union eu;
  eu.w1 = io_apic_read();
  return eu.entry;
}


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rguenth at gcc dot gnu dot
                   |                            |org, mjambor at suse dot cz
             Status|UNCONFIRMED                 |NEW
          Component|c                           |tree-optimization
     Ever Confirmed|0                           |1
           Keywords|                            |ice-on-valid-code
   Last reconfirmed|0000-00-00 00:00:00         |2009-06-05 11:40:57
               date|                            |
            Summary|ice in                      |[4.5 Regression] ice in
                   |generate_subtree_copies for |generate_subtree_copies for
                   |Linux kernel build          |Linux kernel build
   Target Milestone|---                         |4.5.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40351