On Fri, Oct 22, 2010 at 3:59 PM, Steve Reinhardt <[email protected]> wrote: > I'd still really encourage you to work on cutting out the middleman > and find a way to go straight from raw bytes to StaticInsts via a > cache.
Just to be clear: what I mean is that we need a way to do the "tag check" on the PC-indexed decoded page cache using raw bytes, so we can determine hits there without invoking the predecoder. If the decode page cache misses and we have to repopulate it, then how we manage the "backing" decode cache is probably not that big of an issue, and probably does require going through the predecoder since otherwise we won't know necessarily how long the undecoded instruction byte sequence is. In fact the main reason we need a cache there at all is so that we can re-use the same StaticInst in multiple places; I'm not sure it really saves that much time relative to doing the full decode. (Probably some, but I don't know how much.) Steve _______________________________________________ m5-dev mailing list [email protected] http://m5sim.org/mailman/listinfo/m5-dev
