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Bug 21316 – NRVO not triggered for rvalue/ctor call

Status: NEW
Severity: major
Priority: P2
Component: dmd
Product: D
Version: D2
Platform: All
OS: All
Creation time: 2020-10-16T07:24:19Z
Last change time: 2024-12-13T19:12:11Z
Assigned to: No Owner
Creator: Eyal

Moved to GitHub: dmd#19806 →

Comments

Comment #0 by eyal — 2020-10-16T07:24:19Z

Example program: import std.stdio; struct S { this(int x) { writefln("%s", &this); } ~this() { writefln("%s", &this); } } unittest { auto f() { return S(1); } auto x = f(); } Running results in 2 different this ptrs, showing a copy had occurred: dmd -unittest -main -run testnrvo 7FFE98EAAD20 7FFE98EAAD48

Comment #1 by kinke — 2020-10-16T12:08:04Z

NRVO only triggers for lvalues (=> *named* return-value optimization); you're asking for RVO here.

Comment #2 by robert.schadek — 2024-12-13T19:12:11Z

THIS ISSUE HAS BEEN MOVED TO GITHUB https://github.com/dlang/dmd/issues/19806 DO NOT COMMENT HERE ANYMORE, NOBODY WILL SEE IT, THIS ISSUE HAS BEEN MOVED TO GITHUB