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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] d: missed RVO optimization with non-pod structs
Date: Thu, 01 Jul 2021 10:29:50 +0000	[thread overview]
Message-ID: <bug-101273-4-DBRz7Z2Zy6@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-101273-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101273

--- Comment #1 from Iain Buclaw <ibuclaw at gdcproject dot org> ---
(In reply to Iain Buclaw from comment #0)
> It looks like fixing PR d/100882 introduced a small regression:
On further inspection, this is not the case.  The front-end semantic pass
returns us code that uses an intermediate temporary. i.e:

  return __ctor((S tmp = S(), &tmp), 42);

The code generator in D just doesn't detect this pattern and replace `tmp' with
the DECL_RESULT variable to give us a more desired representation:

  S tmp [value-expr: <retval>];
  __ctor(<retval> = S(), &<retval>, 42);
  return <retval>;

  reply	other threads:[~2021-07-01 10:29 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-30 15:03 [Bug d/101273] New: " ibuclaw at gdcproject dot org
2021-07-01 10:29 ` ibuclaw at gdcproject dot org [this message]
2021-07-03 11:08 ` [Bug d/101273] " cvs-commit at gcc dot gnu.org
2021-07-03 11:09 ` cvs-commit at gcc dot gnu.org
2021-07-03 17:06 ` ibuclaw at gdcproject dot org

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