[Bug target/124138] [16 Regression] wrong code with -mavx512f and __builtin_shufflevector() / vpermilpd

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124138

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot 
gnu.org
   Last reconfirmed|                            |2026-02-17
             Status|UNCONFIRMED                 |ASSIGNED
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
  _1 = VEC_PERM_EXPR <v_2(D), v_2(D), { 0, 1, 2, 5, 4, 5, 6, 7 }>;
  _3 = BIT_FIELD_REF <_1, 256, 0>;

that's how it is in .original:

  W w = VIEW_CONVERT_EXPR<W>(TARGET_EXPR <D.3857, BIT_FIELD_REF < VEC_PERM_EXPR
< v , u , { 0, 1, 2, 5, 4, 5, 6, 7 } > , 256, 0>>);

but .gimple has

  _1 = VEC_PERM_EXPR <v, v, { 0, 1, 2, 5, 4, 5, 6, 7 }>;

I'll have a look.