http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53707
--- Comment #15 from Mikael Pettersson <mikpe at it dot uu.se> 2012-07-03 09:56:33 UTC --- Created attachment 27734 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27734 cleaned up test case This cleaned up version of the small C test case should be free of any technical problems, I hope. Gives the same result for -O2 and -O3 with 4.4.7, 4.5.4, 4.7.1, and 4.8.0 (all on x86_64-linux), but with 4.6.4 it returns different results for -O2 and -O3. Weirdly enough, changing the comparison operator from ">" to "<" makes 4.6.4 return the same result for both -O2 and -O3.