[Bug middle-end/115477] compiling with gcc flips the sign of a float return value

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115477

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |INVALID
          Component|c                           |middle-end
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
        float y = number;
        i = * ( long * ) &y;


This is undefined (not just because of aliasing reasons) because you are
reading past the size of y here.  If you use int, since `sizeof(int) ==
sizeof(float)` the code will be less undefined. Note if you used memcpy
instead, the code would have been defined.