Dresdenboys' blog: AMD Bulldozer - Patent based research

[informal]

I just checked again and it is 4 way execution indeed with 2x2way clusters within one module(CPU core) and these two are sharing one wide(256b) SIMD unit.The front end for 4x4way would be way to much complex and expensive ,at least for this generation of products.But still is an option for future iterations of this (previously) unseen design approach. Fastpath comment still stands(even more so now) since 4 fastpath above 4 complex instructions give us precisely total of 8 instructions in one cycle,as dresdenboy found out in his research.
What is amazing is level of detail he "guessed",he has been correct in almost every part of his speculations.I remember Savantu and his bashing against ddboy's blog,how it is just pure wishfull thinking and imagination,how semi companies patent useless stuff all the time etc. Looks like he is this year's honorable bunnysuit winner .

CMT = paper

Yes for now,but it is mini-revolution in 2011 . The approach is novel and needs to be applauded since it's a brave move from AMD.
CMT was all paper for years now,there is academic research papers but not 1 firm ever even presented a possible design solution. The design is much more potent than half-threading(SMT in intel's way of doing things),since resource sharing is done much better in hardware(via common front end and separate int execution units that can share data and one shared dual threaded SIMD unit-a best of both worlds approach). How will it work in practice we'll have to wait and see,but AMD stated that one small bobcat core(based on smae bulldozer) is at the 90% level of today's mainstream performance ,all with that very low power draw .

edit: let's not forget Hans de Vries and his chip-architect website which detailed this very same approach 7 years ago(IIRC). This was the original Hammer design,not the sledgehammer aka K8 which AMD launched back in 2003(not to say K8 wasn't good,quite opposite). Back in those days Hans presented a possible future core from AMD that resembles exactly what dredenboy depicted in his diagrams and what AMD presented today .