d: RVO/NRVO not done when returning a copy constructor

RVO was already being done when returning a constructor call via a
temporary, which in the front-end AST looks like:

    return S.this((__tmp = {}, &__tmp), args...);

But this was not being done for copy construction calls, which instead
looks like:

    return __copytmp = {}, S.this(&__copytmp, V(1).s), __copytmp;

This pattern is now matched and the temporary gets set up as a
DECL_VALUE_EXPR of the RESULT_DECL.

	PR d/123422

gcc/d/ChangeLog:

	* expr.cc (ExprVisitor::visit (ArrayLiteralExp *)): Don't add
	TARGET_EXPR around constructor.
	* toir.cc (IRVisitor::visit (ReturnStatement *)): Recognize more
	patterns for return value optimization.

gcc/testsuite/ChangeLog:

	* gdc.dg/torture/pr123422.d: New test.

0 files changed, 0 insertions, 0 deletions