If we're talking about the discrete GPU card variant of Larrabee, SwiftShader would probably be redundant in its current form.
Larrabee would be hanging of an expansion bus, so it wouldn't be a system processor, and it would already be hiding behind a driver layer that would be doing the same thing.
It might be doable (or might not, if Larrabee's support for x86 and its extensions is as divergent as some are saying), but it's a lot of extra overhead, and it would be giving up on the fixed-function hardware Larrabee's going to have.
Larrabee would be hanging of an expansion bus, so it wouldn't be a system processor, and it would already be hiding behind a driver layer that would be doing the same thing.
It might be doable (or might not, if Larrabee's support for x86 and its extensions is as divergent as some are saying), but it's a lot of extra overhead, and it would be giving up on the fixed-function hardware Larrabee's going to have.