[Boost-users] [Boost.Array] surprising performance issue

Hello, I've discovered a situation where using boost::array results in a 2-fold performance degradation over other array types, including C arrays, tr1::array, and a simple handwritten array class. While the tr1::array performs well, I was suprised to find that it pads the array, so sizeof(tr1::array<3,float>) == sizeof(tr1::array<4,float>). Is that a requirement of tr1::array? Anyway, the performance problem can be seen using Intel C++ (v9.1) on the Itanium platform, using '-O3' optimization. I'm forced to take boost::array out of my computation's inner loop. Is this a previously known issue? Any ideas why this performance discrepancy might exist? Thanks, Bryan Green