On Mon, Dec 17, 2018 at 8:34 AM Thomas Koenig <tkoenig@xxxxxxxxxxxxx> wrote: > > Hi Harald, > > > If there's interest, I can create a bugzilla with test program > > and test data. > > Please do. > > In an ideal world, people would use always use bounds checking, > with almost zero overhead. This is not realistic, but we should > not regress on our way there :-) GCC 9 IL looks saner than the GCC 7/8 one. Note both compilers have bound checks inside the innermost loop. The main difference seems to be in loop header copying where GCC 9 is behaving much "better" IMHO. It would be interesting to see whether -fno-tree-ch brings results of the compilers in-line again (even if it causes the code to run even more slow). Richard. > Regards > > Thomas
