Intel® Core™ Processors

What exactly is a P-state? (Pt. 1)

 

 

A P-state is a voltage and frequency operating point

 

 

 

 

What is a P-state?


When someone refers to a P-state, generally only the frequency is talked about. For example, on my Intel® Core™ processor, P0 is 2.3 GHz, and P1 is 980 MHz. In truth, a P-state is both a frequency and voltage operating point. Both are scaled as the P-state increases. 

 

 

 

 

 

New optimizations for X86 in upcoming GCC 5.0

 

Part1. Vectorization of loads/stores group.

GCC 5.0 significantly improves vector code quality for load groups and store groups. By loads/stores group I mean iterated consecutive sequence of loads/stores. For example:

x = a[i], y = a[i + 1], z = a[i + 2] iterated by “i” is loads group of size 3

Group size is distance between smallest and largest loads/stores addresses. In the example (i + 2) – (i) + 1 = 3

cl_intel_simultaneous_sharing OpenCL extension in a new driver

There is a new Intel® Iris™ and HD Graphics Driver update posted  for Haswell and Broadwell and it contains cl_intel_simultaneous_sharing OpenCL extension. Below please find documentation for that extension.

Name String

    cl_intel_simultaneous_sharing

Version

    Version 7, October 14, 2014

Extension Type

    OpenCL platform extension

Dependencies

    OpenCL 1.2. This extension is written against revision 19 of the

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