On Fri, Jun 02, 2017 at 01:01:14AM +0000, Benjamin Smedberg wrote: > On Thu, Jun 1, 2017 at 8:52 PM Mike Hommey <[email protected]> wrote: > > > Hi, > > > > For some reason, the default when building on Linux had stayed -Os. I > > just landed a change[1] to this default to now use -O2 instead (on > > autoland at the moment). This is going to give better performance to > > local builds (although that might make the build itself take a little > > longer). > > > Does this change affect our shipped build?
Ah, forgot to mention that. No, it doesn't affect *our* shipped builds (because PGO uses a different set of optimization flags). But it does affect downstream builds that don't PGO. > Long ago -Os produced faster builds than -O2 because the memory effects of > larger code outweigh the better in lining. That might not be true any more, > but I'm interested in seeing data. https://treeherder.mozilla.org/perf.html#/compare?originalProject=try&originalRevision=522eae797ae2&newProject=try&newRevision=d99889734dda&framework=1&showOnlyImportant=0 Mike _______________________________________________ dev-platform mailing list [email protected] https://lists.mozilla.org/listinfo/dev-platform
