Other than that, I did notice one thing that doesn't look right. There's an empty loop for the no-op initializer_list ctor to initialize the rest of the array. I should open a bug for that. But that's not a unique to the powerpc64 back end. The x86_64 code has the same empty loop.
I raised bug 69547 - [6 regression] no-op array initializer emits an empty loop, and bisected it to a constexpr change in r222135. Martin
