[Bug tree-optimization/93237] New: vector defined using inserts is not converted into constructors

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93237

            Bug ID: 93237
           Summary: vector defined using inserts is not converted into
                    constructors
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P3
         Component: tree-optimization
          Assignee: pinskia at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

Take this stupid code:
/* { dg-do compile } */
/* { dg-options "-O2 -fdump-tree-optimized" } */


#define vector __attribute__((__vector_size__(4*sizeof(int)) ))

vector int f(int b)
{
  vector int a = {0,0,0,0};
  a[0] = b;
  a[1] = b;
  a[2] = b;
  a[3] = b;
  return a;
}


/* { dg-final { scan-tree-dump-times "BIT_INSERT_EXPR" 0 "optimized" } } */

----- CUT ---
In the end, we should generate a CONSTRUCTOR with just b's.