[email protected] (David Crayford) writes: > Better to compare it to the POWER arch > http://www-03.ibm.com/systems/resources/pwrsysperf_SMT4OnP7.pdf. > It may be CISC not RISC but those lines are getting more blured with > every new churn of z. I would imagine that the SIMD vector units also > originate from POWER. It may seem far fetched but I can see a time in > the not too distant future when the two architectures are converged.
note that in the 90s, i86 cisc started moving to hardware layer that translated cisc instructions into risc micro-ops for execution ... pentium pro, 20yrs ago http://en.wikipedia.org/wiki/Pentium_Pro from above: The Pentium Pro incorporated a new microarchitecture in a departure from the Pentium x86 architecture. It has a decoupled, 14-stage superpipelined architecture which used an instruction pool. The Pentium Pro (P6) featured many advanced concepts not found in the Pentium, although it wasn't the first or only x86 processor to implement them (see NexGen Nx586 or Cyrix 6x86). The Pentium Pro pipeline had extra decode stages to dynamically translate IA-32 instructions into buffered micro-operation sequences which could then be analysed, reordered, and renamed in order to detect parallelizable operations that may be issued to more than one execution unit at once. The Pentium Pro thus featured out of order execution, including speculative execution via register renaming. It also had a wider 36-bit address bus (usable by PAE), allowing it to access up to 64GB of memory. ... snip ... ... this was pipelined so wasn't serialized ... so there has been shrinking difference between popular cisc and risc for a couple decades. http://en.wikipedia.org/wiki/Instruction_pipeline above mentions early pentium4 (2000) with 20 stage pipeline and later pentium4 with 31 stage pipeline recent refs http://www.garlic.com/~lynn/2014m.html#164 Slushware http://www.garlic.com/~lynn/2014m.html#166 Slushware http://www.garlic.com/~lynn/2014m.html#170 IBM Continues To Crumble other recent posts on subject: http://www.garlic.com/~lynn/2015.html#35 [CM] IBM releases Z13 Mainframe - looks like Batman http://www.garlic.com/~lynn/2015.html#36 [CM] IBM releases Z13 Mainframe - looks like Batman http://www.garlic.com/~lynn/2015.html#38 [CM] IBM releases Z13 Mainframe - looks like Batman http://www.garlic.com/~lynn/2015.html#39 [CM] IBM releases Z13 Mainframe - looks like Batman http://www.garlic.com/~lynn/2015.html#40 [CM] IBM releases Z13 Mainframe - looks like Batman http://www.garlic.com/~lynn/2015.html#41 [CM] IBM releases Z13 Mainframe - looks like Batman http://www.garlic.com/~lynn/2015.html#42 [CM] IBM releases Z13 Mainframe - looks like Batman http://www.garlic.com/~lynn/2015.html#43 z13 "new"(?) characteristics from RedBook -- virtualization experience starting Jan1968, online at home since Mar1970 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
