[Bug ipa/58345] ICE with SIGFPE at -O1 on x86_64-linux-gnu (affecting trunk and 4.8)

[mikpe at it dot uu.se]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58345

Mikael Pettersson <mikpe at it dot uu.se> changed:

           What    |Removed                     |Added
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                 CC|                            |mikpe at it dot uu.se

--- Comment #1 from Mikael Pettersson <mikpe at it dot uu.se> ---
I can reproduce with 4.8 and trunk.  Crashes due to division by zero in
fold_array_ctor_reference:

  /* And offset within the access.  */
  inner_offset = offset % (elt_size.to_uhwi () * BITS_PER_UNIT);

Program received signal SIGFPE, Arithmetic exception.
0x00000000005e2448 in fold_array_ctor_reference (ctor=0x7ffff7627ca8,
ctor=0x7ffff7627ca8, from_decl=0x7ffff7535be0, size=0, offset=0,
type=0x7ffff7645540)
    at /mnt/scratch/gcc-4.9-20130901/gcc/gimple-fold.c:2816
2816      inner_offset = offset % (elt_size.to_uhwi () * BITS_PER_UNIT);
(gdb) print elt_size
$1 = {low = 0, high = 0}
(gdb) q

Note that the test case has a static array of an empty struct type.