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The trace cache continues to feed the fetch unit until the trace line ends or until there is a misprediction in the pipeline. If there is a miss, a new trace starts to be built. The Pentium 4's execution trace cache stores micro-operations resulting from decoding x86 instructions, providing also the functionality of a micro-operation cache ...
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.
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.
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.
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.
Pentium is a series of x86 architecture-compatible microprocessors produced by Intel from 1993 to 2023. The original Pentium was Intel's fifth generation processor, succeeding the i486; Pentium was Intel's flagship processor line for over a decade until the introduction of the Intel Core line in 2006.
The first CPU to use this architecture was the Willamette-core Pentium 4, released on November 20, 2000 and the first of the Pentium 4 CPUs; all subsequent Pentium 4 and Pentium D variants have also been based on NetBurst.
P5 (Pentium) 1993 5 Superscalar P6 (Pentium Pro) 14 Speculative execution, register renaming, superscalar design with out-of-order execution P6 14 [4] Branch prediction: P6 (Pentium III) 1995 14 [4] Intel Itanium "Merced" 2001 Single core, L3 cache Intel Itanium 2 "McKinley" 2002 11 [5]