On 15 August 2012 22:38, Mans Rullgard <[email protected]> wrote: > On 15 August 2012 17:17, Matthew Gretton-Dann > <[email protected]> wrote: >> The performance of PGO on 'a popular embedded benchmark' is 14% >> improvement, LTO is 7%. Don't know both together, or SPEC. > > On 'a popular media coding library' PGO gains 2-5% in general, in one case > as much as 11%. The relative gains are larger on average with hand-written > assembly disabled, but obviously nowhere near the performance with it enabled. > > On the same library LTO is 2-3.5 _times_ slower than without on all tests, > although it does pass the test suite.
Sorry for crying wolf. I redid the LTO build and the huge performance drop is gone. Now I'm getting minor gains on most tests and 5-8% loss on a few. More worrying is that it is now failing a few tests. I'll look into both issues and report back. -- Mans Rullgard / mru _______________________________________________ linaro-toolchain mailing list [email protected] http://lists.linaro.org/mailman/listinfo/linaro-toolchain
