[Bug tree-optimization/87901] New: partial DSE of memset doesn't work for other kind of stores

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87901

            Bug ID: 87901
           Summary: partial DSE of memset doesn't work for other kind of
                    stores
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rguenth at gcc dot gnu.org
  Target Milestone: ---

When transforming the memsets in tree-ssa/ssa-dse-25.c to = {} and = 0 inits
the DSE pass no longer knows how to trim them.

Similarly for

int i;
void foo ()
{
  i = 0;
  *((short *)&i + sizeof (int) - sizeof (short)) = 1;
}