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A Toshiba R4000 microprocessor A IDT R4000 microprocessor MIPS R4000 die shot. The R4000 is a microprocessor developed by MIPS Computer Systems that implements the MIPS III instruction set architecture (ISA). Officially announced on 1 October 1991, it was one of the first 64-bit microprocessors and the first MIPS III implementation.
Commercial simulators are available especially for the embedded use of MIPS processors, for example Wind River Simics (MIPS 4Kc and 5Kc, PMC RM9000, QED RM7000, Broadcom/Netlogic ec4400, Cavium Octeon I), Imperas (all MIPS32 and MIPS64 cores), VaST Systems (R3000, R4000), and CoWare (the MIPS4KE, MIPS24K, MIPS25Kf and MIPS34K).
In 1991 MIPS released the first 64-bit microprocessor, the R4000. However, MIPS had financial difficulties while bringing it to market. The design was so important to SGI, at the time one of MIPS' few major customers, that SGI bought the company in 1992 to guarantee the design would not be lost. The new SGI subsidiary was named MIPS Technologies.
The CPU IP cores comprising the MIPS Series5 ‘Warrior’ family are based on MIPS32 release 5 and MIPS64 release 6, and will come in three classes of performance and features: 'Warrior M-class': entry-level MIPS cores for embedded and microcontroller applications, a progression from the popular microAptiv family
The later R4000 uses the same trivial "not-taken" branch prediction, and loses two cycles to each taken branch because the branch resolution recurrence is four cycles long. Branch prediction became more important with the introduction of pipelined superscalar processors like the Intel Pentium, DEC Alpha 21064, the MIPS R8000, and the IBM POWER ...
MIPS Computer Systems Inc. was founded in 1984 [11] by a group of researchers from Stanford University including John L. Hennessy and Chris Rowen. These researchers had worked on a project called MIPS (for Microprocessor without Interlocked Pipeline Stages), one of the projects that pioneered the RISC concept. Other principal founders were Skip ...
In the MIPS design, the register file had 32 entries. At the same time the register file is read, instruction issue logic in this stage determines if the pipeline is ready to execute the instruction in this stage. If not, the issue logic causes both the Instruction Fetch stage and the Decode stage to stall.
NEC VR10000 die shot. The R10000 is a four-way superscalar design that implements register renaming and executes instructions out-of-order.Its design is a departure from previous MTI microprocessors such as the R4000, which is a much simpler scalar in-order design that relies largely on high clock rates for performance.
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