On Sat, May 27, 2023 at 2:38 PM Stefan Kanthak <stefan.kant...@nexgo.de> wrote: > > "Jakub Jelinek" <ja...@redhat.com> wrote, completely clueless: > > > On Sat, May 27, 2023 at 11:04:11PM +0200, Stefan Kanthak wrote: > >> OUCH: popcnt writes the WHOLE result register, there is ABSOLUTELY > >> no need to clear it beforehand nor to clear the higher 24 bits > >> afterwards! > > > > Except that there is. See https://gcc.gnu.org/PR62011 for details. > > GUESS WHY I EXPLICITLY WROTE > > | JFTR: before GCC zealots write nonsense: see -march= or -mtune= > > NOT AMUSED ABOUT YOUR CRYING INCOMPETENCE!
So you want to complain about GCC knowing about an Intel performance errata???? If you read that bug report, you would have learned why the zeroing is done. I am sorry you hate GCC for actually following advice from the processor maker after all. > Stefan
