[Bug tree-optimization/56488] [4.7 Regression] wrong code for loop at -O3

[glisse at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56488

--- Comment #3 from Marc Glisse <glisse at gcc dot gnu.org> 2013-03-01 09:53:20 UTC ---
Seems to me that 'e' is signed and the testcase relies on wrapping overflow
(-fwrapv helps).