[Bug c/47271] gcc-4.6 -O1 -ftree-vectorize removes a test (if), the function generates invalid outputs

[victor.stinner at haypocalc dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47271

--- Comment #1 from Victor Stinner <victor.stinner at haypocalc dot com> 
2011-01-12 18:54:32 UTC ---
Created attachment 22951
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22951
Example to reproduce the bug