[Bug middle-end/116299] GCC optimizes away code when long double is represented by the IBM double-double method.

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116299

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
         Resolution|---                         |INVALID

--- Comment #9 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
It is not optimized away.
There is contraction happening and producing an 2 FMAs (or in this case FMS:
fused multiply subtract).

Use -ffp-contract=standard or =off if you don't want that.


  x_double_14 = (const double) x_13(D);
  _1 = .FMS (x_double_14, 3.4359738369e+10, x_double_14);
  xhi_double_16 = .FMS (x_double_14, 3.4359738369e+10, _1);