[Bug c/48228] incorrect signed overflow warning when only 0 and 1 are used

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48228

--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-03-22 
10:29:28 UTC ---
Hm, not similar.  We have

Visiting PHI node: terminal_window_p_24 = PHI <terminal_window_p_3(8)>

    Argument #0 (8 -> 9 executable)
        terminal_window_p_3
        Value: [0, 1]
Found new range for terminal_window_p_24: [0, +INF(OVF)]

which in the end triggers this.