[Bug middle-end/22456] [4.1/4.2/4.3 regression] missing "is used uninitialized" warning

[rguenth at gcc dot gnu dot org]

------- Comment #12 from rguenth at gcc dot gnu dot org  2007-04-11 22:24 -------
Created an attachment (id=13354)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=13354&action=view)
patch to preserve uninitialized PHI arguments in CCP

like so.  -O -Wall gives

t.i: In function 'foo':
t.i:3: warning: 'i' may be used uninitialized in this function


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22456