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In computer architecture, a trace cache or execution trace cache is a specialized instruction cache which stores the dynamic stream of instructions known as trace. It helps in increasing the instruction fetch bandwidth and decreasing power consumption (in the case of Intel Pentium 4 ) by storing traces of instructions that have already been ...
The Pentium 4 can have 126 micro-operations in flight at the same time. [13]: 10 Micro-operations are decoded and stored in an Execution Trace Cache with 12,000 entries, to avoid repeated decoding of the same x86 instructions. [13]: 5 Groups of six micro-operations are packed into a trace line.
Pentium 4 [3] [4] is a series of single-core CPUs for desktops, laptops and entry-level servers manufactured by Intel. The processors were shipped from November 20, 2000 until August 8, 2008. [5] [6] All Pentium 4 CPUs are based on the NetBurst microarchitecture, the successor to the P6.
Used in Pentium 4, Pentium D, and some Xeon microprocessors. Very long pipeline. The Prescott was a major architectural revision. Later revisions were the first to feature Intel's x86-64 architecture, enhanced branch prediction and trace cache, and eventually support was added for the NX (No eXecute) bit to implement executable-space protection.
A CPU cache is a hardware cache used by the central processing unit (CPU) of a computer to reduce the average cost (time or energy) to access data from the main memory. [1] A cache is a smaller, faster memory, located closer to a processor core, which stores copies of the data from frequently used main memory locations.
Complex cache indexing. If 1, then cache uses a complex function for cache indexing, else the cache is direct-mapped. (#4) 2 3 (reserved) 3 4 (reserved) 4 7:5 Cache Level (starting from 1) (reserved) 7:5 8 Self initializing cache level (1=doesn't need software initialization after reset) (reserved) 8 9 Fully Associative Cache (reserved) 9 10
The Digital Scientific Corp. Meta 4 Series 16 computer system was a user-microprogammable system first available in 1970. The microcode had a primarily vertical style with 32-bit microinstructions. [34] The instructions were stored on replaceable program boards with a grid of bit positions.
Diagram of a CPU memory cache operation. In computing, a cache (/ k æ ʃ / ⓘ KASH) [1] is a hardware or software component that stores data so that future requests for that data can be served faster; the data stored in a cache might be the result of an earlier computation or a copy of data stored elsewhere.