On Wed, Apr 11, 2012 at 5:38 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.
No, since this "pass" is applied rarely. Conditions are mentioned in
the comments to ix86_sched_reorder
> a...@linux.intel.com -- Speaking for myself only