http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54340
--- Comment #1 from Mikael Pettersson <mikpe at it dot uu.se> 2012-08-21 07:22:09 UTC --- You didn't specify the host, but since it's Ubuntu I'm guessing Linux/x86_64. I can't reproduce the SIGILL with either 4.7.1, 4.6.3, or 4.5.4 on a Core i7. Can you reproduce with a gcc built from unpatched upstream sources? If not then you should report this to Ubuntu as their gcc is a heavily modified version.
