On 3 February 2010 21:02, Ding Curie <ding.curie@xxxxxxxxx> wrote: > > output: >> p1 - p2 = 1024 > > (Optimize or not makes no difference.) > Subtraction between pointers to different arrays is undefined, iirc, so any result is legal. It's possible, for instance, that the 1024 is determined in one stage, and coalescing happens later. Have you checked the assembly to see what actually happens?
