[Bug middle-end/59225] missing maybe uninitialized warning following single if

manu at gcc dot gnu.org gcc-bugzilla@gcc.gnu.org
Thu Nov 21 03:43:00 GMT 2013


Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |manu at gcc dot gnu.org
         Resolution|---                         |DUPLICATE

--- Comment #1 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
CCP assumes y == 1 in the first testcase, this is PR18501

In the second testcase, y may be either 1 or 2, so CCP does not kick-in, and 
nothing removes the undefined operand of the PHI node:

  # RANGE [1, 2] NONZERO 0x00000000000000003   
  # y_1 = PHI <[test2.c : 5:7] 1(6), y_3(D)(4), [test2.c : 7:7] 2(7)>
  [test2.c : 8:3] # VUSE <.MEM_4(D)>
  return y_1;

so we can warn.

*** This bug has been marked as a duplicate of bug 18501 ***

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