On Tuesday 28 June 2005 14:02, Ulrich Weigand wrote: > Steven Bosscher wrote: > > Anyway, I've started a SPEC run with "-O2" vs. "-O2 -fwrapv". Let's see > > how big the damage would be ;-) > > Please make sure to include a 64-bit target, where it actually makes any > difference. (I recall performance degradations of 20-30% in some > SPECfp cases from getting induction variable reduction wrong ...)
Yeah, I'm testing on an AMD64 box, both 64 bits and 32 bits. Gr. Steven
