[Bug rtl-optimization/31485] C complex numbers, amd64 SSE, missed optimization opportunity

["rguenth at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #7 from rguenth at gcc dot gnu dot org  2010-04-17 11:11 -------
We now have basic-block vectorization but it still works on memory accesses
(visible on the gimple level) only.  So it doesn't handle

add1 (ss1 a, ss1 b)
{
  float D.3164;
  float D.3163;
  float b$imag;
  float b$real;
  float a$imag;
  float a$real;
  ss1 D.3154;

<bb 2>:
  a$real_4 = REALPART_EXPR <a_1(D)>;
  a$imag_5 = IMAGPART_EXPR <a_1(D)>;
  b$real_6 = REALPART_EXPR <b_2(D)>;
  b$imag_7 = IMAGPART_EXPR <b_2(D)>;
  D.3163_8 = a$real_4 + b$real_6;
  D.3164_9 = a$imag_5 + b$imag_7;
  D.3154_3 = COMPLEX_EXPR <D.3163_8, D.3164_9>;
  return D.3154_3;

}

though maybe it could be teached to see REAL/IMAG_PART exprs as loads
and COMPLEX_EXPR as store.  Ira?


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |irar at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31485