search for: inefficieci

...I've run across several things which are clunky in the current isel design. A couple examples I can remember offhand: 1. We have special target-specific operators for certain shuffles in X86, such as X86unpckl. I don't completely understand why but Bruno indicated it was to address inefficiecies. One of those is the need to check masks multiple times (once at legalize and again at isel). 2. Sometimes DAGs are legal in some contexts but not others and it is a pain to deal with. A good example is VBROADCAST, where a <0,0,0,0> shuffle is natively supported if the source ve...

Hi! I just wondered if anyone would mine posting their successful jitter buffer settings here for me if they get a moment ?? I've spent a few hours trying to set the jitter buffer up reasonably logically and can definitely tell it makes a difference and can introduce latency and echo if setup incorrectly but I can't see a good post anywhere describing properly what the three settings

...eral things which are clunky in the current isel > design. A couple examples I can remember offhand: > > 1. We have special target-specific operators for certain shuffles in X86, > such as X86unpckl. I don't completely understand why but Bruno > indicated it was to address inefficiecies. One of those is the need > to check masks multiple times (once at legalize and again at isel). It also eliminates a lot of fragility. Before doing this, X86 legalize would have to be very careful to specifically form shuffles that it knew isel would turn into (e.g.) unpck operations. No...