On Thu, 11 Oct 2018, Jason A. Donenfeld wrote: > > I realize this is probably a fairly trivial matter, but I am very > curious if somebody knows which heuristic gcc is applying here, and > why exactly. It's not something done by any other compiler I could > find, and it only started happening with gcc 6.
It's a change in register allocation, gcc selects eax instead of esi for the shifts. Doesn't appear to be obviously intentional, could be a bug or bad luck. Alexander
