On 13 August 2017 at 15:18, Luc Van Oostenryck <luc.vanoostenryck@xxxxxxxxx> wrote: > On Sun, Aug 13, 2017 at 3:18 PM, Dibyendu Majumdar > <mobile@xxxxxxxxxxxxxxx> wrote: > >>> Care to send your code, I can see where the problem could be? >> >> Yes apologies I should have mentioned the test case: >> >> https://github.com/dibyendumajumdar/dmr_c/blob/master/tests/lcc/cq.c > > No problem. > >> I am checking whether the slowdown is due to some other factor such as: > > I just gave a try and, I was a bit surprised as with the current master, > here it takes me about 5s to get the output of test-linearize (which I find > already a bit slow). It's far far from the time you have. > > OTOH with -rc4, it takes only 0.05s ! > > The situation is really weird, it's an interaction between the patches: > - remove single-store shortcut (first slowdown to 0.8s) > - fix ptrlist corruption while killing unreachable BBs (second slowdown to 2.9s) > - mark pseudo users as deleted instead of removing them (third slowdown to 5.5s) > > All three patches were expected to create *some* slowdown, > the first one very obviously and much more than the others. > > It's interesting to note that without the 'remove single shortcut' patch, the > two others ones don't seem to have a significative effect on the time. > Yes, reinstating the single store shortcut reduces time from 8.3 secs to 0.16 seconds. Regards Dibyendu -- To unsubscribe from this list: send the line "unsubscribe linux-sparse" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
