[Bug tree-optimization/58277] wrong code at -O3 (affecting 4.7, 4.8, and trunk)

[su at cs dot ucdavis.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58277

--- Comment #2 from Zhendong Su <su at cs dot ucdavis.edu> ---
I'm also attaching a related testcase (small2.c) for both 32-bit and 64-bit
modes. 

$ gcc-trunk -m64 -O2 small2.c
$ a.out
$ gcc-4.6 -m64 -O3 small2.c
$ a.out
$ gcc-4.7 -m64 -O3 small2.c
$ a.out
Aborted (core dumped)
$ gcc-4.8 -m64 -O3 small2.c
$ a.out
Aborted (core dumped)
$ gcc-trunk -m64 -O3 small2.c
$ a.out
Aborted (core dumped)
$