[Bug tree-optimization/79920] Incorrect floating point results when compiling with -O3

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79920

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P2
             Status|UNCONFIRMED                 |ASSIGNED
      Known to work|                            |5.4.1
           Keywords|                            |wrong-code
   Last reconfirmed|                            |2017-03-07
          Component|c                           |tree-optimization
     Ever confirmed|0                           |1
   Target Milestone|---                         |6.4
      Known to fail|                            |6.3.1, 7.0.1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I can confirm your findings, GCC 5 seems fine.  -fno-tree-vectorize fixes it. 
I will have a looksee.