search for: hw529k

Thanks for the reduced test case, I’ll try to take a look by the end of the week. > On Feb 20, 2019, at 6:53 PM, Nemanja Ivanovic <nemanja.i.ibm at gmail.com> wrote: > > Finally managed to reduce this to something manageable: https://godbolt.org/z/Hw529k <https://godbolt.org/z/Hw529k> > > On line 40 of the output, we have a load-immediate to put zero into R3. Then we spill that value on the next line. And as far as I can tell, we reload it on line 97 before the call to getValueAsBit(). > > On Wed, Feb 20, 2019 at 7:33 PM Nemanja...

I do have a reproducer, but it's not for the faint of heart :) This is from a large and messy C file (Perlbench's regexec.c), reduced by bugpoint down to 1050 lines of IR. Perhaps I can paste it on pastebin. Just for fun, I added some debug dumps for machine instructions that spill registers (i.e. return non-zero from MachineInstr::getFoldedSpillSize()) that are fed by load-immediates and

...wrote: > > Thanks for the reduced test case, I’ll try to take a look by the end of > the week. > > On Feb 20, 2019, at 6:53 PM, Nemanja Ivanovic <nemanja.i.ibm at gmail.com> > wrote: > > Finally managed to reduce this to something manageable: > https://godbolt.org/z/Hw529k > > On line 40 of the output, we have a load-immediate to put zero into R3. > Then we spill that value on the next line. And as far as I can tell, we > reload it on line 97 before the call to getValueAsBit(). > > On Wed, Feb 20, 2019 at 7:33 PM Nemanja Ivanovic <nemanja.i.ibm a...