[PATCH] Atom: Enabling unroll at O2 optimization level

[Igor Zamyatin]

Hi All!

Here is a patch that enables unroll at O2 for Atom.

This gives good performance boost on EEMBC 2.0 (~+8% in Geomean for 32
bits) with quite moderate code size increase (~5% for EEMBC2.0, 32
bits).

Tested for i386 and x86-64, ok for trunk?

Thanks,
Igor

ChangeLog:

2012-04-10  Yakovlev Vladimir  <vladimir.b.yakov...@intel.com>

       * gcc/config/i386/i386.c (check_imull): New routine.
       (ix86_loop_unroll_adjust): New target hook.
       (ix86_option_override_internal): Enable unrolling on Atom at -O2.
       (TARGET_LOOP_UNROLL_ADJUST): New define.

unroll.patch
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