[Bug tree-optimization/100434] New: DSE fails to DSE aggregate LHS.

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100434

            Bug ID: 100434
           Summary: DSE fails to DSE aggregate LHS.
           Product: gcc
           Version: 12.0
            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: ---

struct X { int x; };
extern struct X foo (void);
struct X x;
void bar()
{
  x = foo();
  x = (struct X){};
}

the store to x from the call to foo() is not DSEd.  It works for aggregate
copies
x = y; though.