Messages in this thread | | | Subject | Re: [patch] entry.S asm improvement (removed some ugly jmp) | From | Benoit Poulot-Cazajous <> | Date | 28 Nov 1998 10:39:39 +0100 |
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> >> This my patch (from arca-33) should be obviously right and will improve > >> performance... > > > >Have you actually tested it? It breaks any branch prediction hardware that > >uses a return stack. > > The time of 2.1.130 simulation is 2.603s, the timings of 2.1.130 + my > patch simulation is 2.601s. This is true on P5MMX I don' t know on other > CPUs (any volunteers?). My patch produce also smaller code and looks like > more nice to me ;)
It is a lot SLOWER in my K6-2/300 :
2.1.130 simulation : 1.125s 2.1.130 + your patch : 2.954s
It is also slower on a PII/300 :
2.1.130 simulation : 1.790s 2.1.130 + your patch : 3.284s
-- Benoit
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