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From: "ibuclaw at gdcproject dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug d/101273] New: d: missed RVO optimization with non-pod structs
Date: Wed, 30 Jun 2021 15:03:57 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101273

            Bug ID: 101273
           Summary: d: missed RVO optimization with non-pod structs
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: d
          Assignee: ibuclaw at gdcproject dot org
          Reporter: ibuclaw at gdcproject dot org
  Target Milestone: ---

It looks like fixing PR d/100882 introduced a small regression:
---
struct S
{
    int x;
    S *impl;
    this(int x)
    {
        this.x =3D x;
        this.impl =3D &this;
    }
    ~this() { }
}

S makeS()
{
    return S(42);
}

S nrvo()
{
    S ret =3D S(2);
    return ret;=20
}

S rvo()
{
    return makeS();=20
}

void main()
{
    auto a1 =3D nrvo();
    assert(&a1 is a1.impl);
    auto b1 =3D rvo();
    assert(&b1 is b1.impl);
    return;
}=