On Wed, 2011-06-01 at 16:49 +0100, Julian Brown wrote: > This patch tweaks the behaviour of arm_final_prescan_insn when tuning > for Cortex-A5 cores, since branches are cheaper than long sequences of > conditionalised instructions on those processors. As posted in the > previous patch, this provides a measurable increase in performance on a > popular embedded benchmark. > > (I didn't use the tuning infrastructure for this one, though it could > easily be changed to do so, now I come to think of it.) > > Testing is still in progress. OK to apply, pending success with that? > > Thanks, > > Julian > > ChangeLog > > gcc/ > * config/arm/arm.c (arm_tune_cortex_a5): New variable. > (arm_option_override): Use above. Set max_insns_skipped to 1 when > tuning for Cortex-A5. > * config/arm/arm.h (arm_tune_cortex_a5): Add declaration.
I would much prefer that this was done through the tuning infrastructure. If one core likes it this way, there's a strong chance of another one coming along that has similar preferences. R.
