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. My guess here is that indeed, with this input, the single-store shortcut is a huge optimization and without it much much more code is created (phi-nodes, I suppose) and this impact very negatively the two other fixes. I'll see what can be done. -- Luc -- 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
