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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/114800] DSE does not remove set-zero which is
 partial redundant
Date: Mon, 22 Apr 2024 23:35:00 +0000
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X-Bugzilla-Component: tree-optimization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114800

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|redundant set-zero when     |DSE does not remove
                   |initiate a struct           |set-zero which is partial
                   |                            |redundant

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
here is a testcase which shows the problem with when either front-ends:
```
struct thresh_restart {
        int             *f0;
        int                     f1;
        int                     f2;
        int                     f3;
};

int arr[10];
void __attribute__((noinline)) foo(struct thresh_restart *p) {
    arr[0] =3D p->f3;
    arr[1] =3D p->f1;
}

void func(int *b) {
    struct thresh_restart tr =3D {};
    tr.f3 =3D 3;
    tr.f1 =3D 1;
    foo(&tr);
}
```=