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While the idea to delay the construction of the QVLAs until we know we need them is elegant, we're doing a lot of checks twice or thrice this way, so merely re-set the a, b pointers and otherwise continue executing. This requires us to default-construct the QVLAs before potentially assign()ing to them, but that ought to be cheap, given the compiler can see everything that's going on in QVLA. Pick-to: 6.9 6.8 6.5 Change-Id: I4e42d5ab48711af91cc1785171524be5fb45ae2f Reviewed-by: Thiago Macieira <thiago.macieira@intel.com> Reviewed-by: Ahmad Samir <a.samirh78@gmail.com>