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.
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