One should not forget another important thing: 1GFLOP in CPU is more expensive in terms of power than 1GFLOP in a GPU. So it's not only about chasing GFLOPs, in the mobile and embedded world it's also all about power.
Anyway, Cortex-A15 is capable of 8 flops per cycle per core which puts it pretty good in theoretical efficiency for its likely power draw at current clocks.
And I never managed to get close to 8 ins per cycle on A15, but, for example, an FFT implementation on VC4 is pretty close to a theoretical performance limit. And a fully loaded 4-core A15 will draw far above 500mW anyway.