[Bug tree-optimization/96167] fails to detect ROL pattern in simple case, but succeeds when operand goes through memcpy

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96167

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|target                      |tree-optimization
             Target|                            |x86_64-*-* i?86-*-*
           Keywords|                            |missed-optimization
                 CC|                            |ebotcazou at gcc dot gnu.org,
                   |                            |jakub at gcc dot gnu.org

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
store-merging to the rescue?

  tmp_3 = MEM[(int &)x_1(D)];
  _4 = MEM[(int &)x_1(D) + 4];
  MEM[(int &)x_1(D)] = _4;
  MEM[(int &)x_1(D) + 4] = tmp_3;