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Advanced Dynamic Execution:
The Advanced Dynamic Execution engine is a very deep, out-of-order speculative execution engine that
keeps the execution units executing instructions. The Pentium 4 processor can also view 126 instructions
in flight and handle up to 48 loads and 24 stores in the pipeline. It also includes an enhanced branch
prediction algorithm that has the net effect of reducing the number of branch mis-predictions by about
33% over the P6 generation processor’s branch prediction capability. It does this by implementing a 4KB
branch target buffer that stores more detail on the history of past branches, as well as by implementing a
more advanced branch prediction algorithm.
Enhanced Floating-Point and Multimedia Unit:
The Pentium 4 processor expands the floating-point registers to a full 128-bit and adds an additional register
for data movement which improves performance on both floating-point and multimedia applications.
Internet Streaming SIMD Extensions 2 (SSE2):
With the introduction of SSE2, the NetBurst micro-architecture now extends the SIMD capabilities that
MMX technology and SSE technology delivered by adding 144 new instructions. These instructions include
128-bit SIMD integer arithmetic and 128-bit SIMD double-precision floating-point operations. These new
instructions reduce the overall number of instructions required to execute a particular program task and as a
result can contribute to an overall performance increase. They accelerate a broad range of applications,
including video, speech, and image, photo processing, encryption, financial, engineering and scientific
applications.
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