http://d.puremagic.com/issues/show_bug.cgi?id=7353
Summary: NRVO not properly working with inferred return type Product: D Version: D1 & D2 Platform: All OS/Version: All Status: NEW Keywords: performance Severity: normal Priority: P2 Component: DMD AssignedTo: nob...@puremagic.com ReportedBy: mrmoc...@gmx.de --- Comment #0 from Trass3r <mrmoc...@gmx.de> 2012-01-23 16:27:36 CET --- import std.stdio; struct S { static uint ci = 0; uint i; this(int x) { i = ci++; writeln("new: ", i); } this(this) { i = ci++; writeln("copy ", i); } ~this() { writeln("del ", i); } S save1() // produces 2 copies in total { S s = this; return s; } auto save2() // produces 3 copies in total { S s = this; return s; pragma(msg, typeof(return)); } S save3() { return this; } } void main() { { S s = S(1); S t = S(1); t = s.save1(); } writeln("-"); S.ci = 0; { S s = S(1); S t = S(1); t = s.save2(); } writeln("-"); S.ci = 0; { S s = S(1); S t = S(1); t = s.save3(); } } $ dmd -run test.d //or dmd -release -run test.d //or dmd -release -O -run test.d S new: 0 new: 1 copy 2 del 1 del 2 del 0 - new: 0 new: 1 copy 2 copy 3 del 2 del 1 del 3 del 0 - new: 0 new: 1 copy 2 del 1 del 2 del 0 $ dmd -release -O -inline -run test.d S new: 0 new: 1 copy 2 del 1 del 2 del 0 - new: 0 new: 1 copy 2 copy 3 del 2 del 1 del 3 del 0 - new: 0 new: 1 del 1 del 0 del 0 -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------