A P-state is a voltage and frequency operating point
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.
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
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.
Version 7, October 14, 2014
OpenCL platform extension
OpenCL 1.2. This extension is written against revision 19 of the
The performance improvement an application gets from being compiled with optimization can be enhanced by understanding and acting on optimization reports. Fortunately, this has become much easier with the latest compilers from Intel. Modern optimizing compilers can often make code transformations that greatly improve application performance, but this may depend on how the original code is written and how much information is available to the compiler.