https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68378
Bug ID: 68378
Summary: Return value optimization does not fire iff in C mode
Product: gcc
Version: 4.8.4
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: eyal.lotem at gmail dot com
Target Milestone: ---
struct Foo { int x[1000]; };
struct Foo f(void);
struct Foo g(void) {
struct Foo x = f();
return x;
}
When built with -O3 -xc this generates superfluous inefficient copying.
When built with -O3 -xc++ this generates an efficient call without copying.
Copying should not be generated here.
