> 150 and 200 make Silvermont performance better on 173.applu (+8%) and > 183.equake (+3%); Haswell spec2006 performance stays almost unchanged. > Higher value of 300 leave the performance of mentioned tests > unchanged, but add some regressions on other benchmarks. > > So I like 200 as well as 120 and 150, but can confirm performance > gains only for x86.
IMO it's either 150 or 200. We chose 200 for our 4.9-based compiler because this gave the performance boost without affecting the code size (on x86-64) and because this was previously 400, but it's your call. -- Eric Botcazou