On Wed, Apr 11, 2012 at 3:38 PM, Andi Kleen <a...@firstfloor.org> wrote: > Igor Zamyatin <izamya...@gmail.com> writes: > >> Hi All! >> >> It is known that imul placement is rather critical for Atom processors >> and changes try to improve imul scheduling for Atom. >> >> This gives +5% performance on several tests from new OA 2.0 testsuite >> from EEMBC. >> >> Tested for i386 and x86-64, ok for trunk? > > Did you measure how much this slows down the compiler when compiling > for Atom? The new pass looks rather slow.
Also please explain why adjusting the automaton for Atom is not a way to attack this issue. Richard. > -Andi > > -- > a...@linux.intel.com -- Speaking for myself only
