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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.
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
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.
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).
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 ...
Pipeline stages Misc Elbrus-8S: 2014 VLIW, Elbrus (proprietary, closed) version 5, 64-bit AMD K5: 1996 5 Superscalar, branch prediction, speculative execution, out-of-order execution, register renaming [a] AMD K6: 1997 6 Superscalar, branch prediction, speculative execution, out-of-order execution, register renaming [b] AMD K6-III: 1999
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 ...
The MIPS Magnum R4000 PC-50 has a MIPS R4000PC processor with only 16 kB L1 cache (but no L2 cache), running at an external clock rate of 50 MHz (which was internally doubled in the microprocessor to 100 MHz). The MIPS Magnum R4000 SC-50 is identical to the Magnum R4000PC, but includes one megabyte of secondary cache in addition to the primary ...