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Re: [PATCH] Atom: Scheduler improvements for better imul placement
On Wed, Apr 11, 2012 at 3:38 PM, Andi Kleen <email@example.com> wrote:
> Igor Zamyatin <firstname.lastname@example.org> 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.
> email@example.com -- Speaking for myself only