[Bug tree-optimization/121284] [14/15/16 Regression] unnecessary memory operations on vector conversion from double to int

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121284

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
          Component|target                      |tree-optimization
   Last reconfirmed|                            |2025-07-28
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
trunk:
  _3 = {_8, _9, _10, _11, _12, _13, _14, _15};
  _16 = BIT_FIELD_REF <_3, 256, 0>;
  _17 = BIT_FIELD_REF <_3, 256, 256>;
  _18 = VEC_PACK_FIX_TRUNC_EXPR <_16, _17>;

13:
  _16 = {_8, _9, _10, _11};
  _17 = {_12, _13, _14, _15};
  _18 = VEC_PACK_FIX_TRUNC_EXPR <_16, _17>;

Though I think the real issue:
  _1 = {x_4(D), { 0.0, 0.0 }};
  _2 = {y_5(D), { 0.0, 0.0 }};
  _3 = VEC_PERM_EXPR <_1, _2, { 0, 1, 4, 5 }>;
  _6 = .VEC_CONVERT (_3);

is that vec perm should become:
 _3 = {x_4(D), y_5(D)};