[Bug tree-optimization/92860] [9/10/11/12 regression] Global flags affected by -O settings are clobbered by optimize attribute

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92860

--- Comment #86 from Martin Liška <marxin at gcc dot gnu.org> ---
Optimized dump is equal:

void cl_optimization_save ()
{
  vector(8) short int vect__2.20;
  vector(16) char vect__2.19;
  int val0.0_1;
  int val1.15_3;
  vector(4) int _22;
  vector(4) int _25;

  <bb 2> [local count: 1073741824]:
  val0.0_1 = val0;
  _25 = {val0.0_1, val0.0_1, val0.0_1, val0.0_1};
  val1.15_3 = val1;
  _22 = {val0.0_1, val0.0_1, val0.0_1, val1.15_3};
  vect__2.20_26 = VEC_PACK_TRUNC_EXPR <_25, _25>;
  vect__2.20_27 = VEC_PACK_TRUNC_EXPR <_25, _22>;
  vect__2.19_28 = VEC_PACK_TRUNC_EXPR <vect__2.20_26, vect__2.20_27>;
  MEM <vector(16) char> [(char *)&cl_optimization_save_ptr] = vect__2.19_28;
  return;

}