[Bug target/121099] GCC doesn't optimize `_mm_set_ps()` very well

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121099

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2025-07-16

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
We expand from

  _1 = -y_2(D);
  _5 = {x_4(D), 0.0, _1, 0.0};
  _6 = {y_2(D), y_2(D), x_4(D), x_4(D)};
  _7 = __builtin_ia32_cmpgtps (_6, _5);
  _8 = __builtin_ia32_movmskps (_7); [tail call]
  return _8; 

{y_2(D), y_2(D), x_4(D), x_4(D)} should be handled by target vec_init.

The quoted clang code needs more than just SSE2.