Updated user's guide to comply with Intel® Xeon Phi™ brand usage guidelines
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@@ -7,8 +7,9 @@ of small bugs have been fixed.
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New targets:
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New targets:
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* This release provides "beta" support for compiling to Intel Xeon Phi (the
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* This release provides "beta" support for compiling to Intel® Xeon
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"Many Integrated Core" arthiecture). See
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Phi™ processor, code named Knights Corner, the first processor in
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the Intel® Many Integrated Core Architecture. See
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http://ispc.github.com/ispc.html#compiling-for-the-intel-xeon-phi-architecture
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http://ispc.github.com/ispc.html#compiling-for-the-intel-xeon-phi-architecture
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for more details on this support.
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for more details on this support.
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@@ -59,7 +59,7 @@ Contents:
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+ `Basic Command-line Options`_
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+ `Basic Command-line Options`_
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+ `Selecting The Compilation Target`_
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+ `Selecting The Compilation Target`_
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+ `Generating Generic C++ Output`_
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+ `Generating Generic C++ Output`_
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+ `Compiling For The Intel Xeon Phi Architecture`_
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+ `Compiling For The Intel® Many Integrated Core Architecture`_
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+ `Selecting 32 or 64 Bit Addressing`_
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+ `Selecting 32 or 64 Bit Addressing`_
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+ `The Preprocessor`_
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+ `The Preprocessor`_
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+ `Debugging`_
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+ `Debugging`_
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@@ -560,14 +560,16 @@ C++ file; this can be used to easily include specific implementations of
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the vector types and functions.
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the vector types and functions.
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Compiling For The Intel Xeon Phi Architecture
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Compiling For The Intel® Many Integrated Core Architecture
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---------------------------------------------
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----------------------------------------------------------
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``ispc`` has beta-level support for compiling for the many-core Intel® Xeon
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``ispc`` has beta-level support for compiling for the many-core Intel®
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Phi architecture (formerly, "Many Integrated Cores" / MIC.) This support
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Xeon Phi™ processor, part of the Intel® Many Integrated Core
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is based on the "generic" C++ output, described in the previous section.
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Architecture (MIC). For the first generation of processor, code named
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Knights Corner, this support is based on the "generic" C++ output,
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described in the previous section.
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To compile for Xeon Phi, first generate intermediate C++ code:
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To compile for Knight's Corner, first generate intermediate C++ code:
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::
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::
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@@ -575,19 +577,19 @@ To compile for Xeon Phi, first generate intermediate C++ code:
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--c++-include-file=knc.h
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--c++-include-file=knc.h
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The ``ispc`` distribution now includes a header file,
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The ``ispc`` distribution now includes a header file,
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``examples/intrinsics/knc.h``, which maps from the generic C++ output to
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``examples/intrinsics/knc.h``, which maps from the generic C++ output
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the corresponding intrinsic operations for Intel Xeon Phi. Thus, to
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to the corresponding intrinsic operations supported by Knights Corner. Thus,
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generate an object file, use the Intel C Compiler (``icc``) compile the C++
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to generate an object file, use the Intel C Compiler (``icc``) compile
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code generated by ``ispc``, setting the ``#include`` search path so that it
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the C++ code generated by ``ispc``, setting the ``#include`` search
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can find the ``examples/intrinsics/knc.h`` header file in the ``ispc``
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path so that it can find the ``examples/intrinsics/knc.h`` header file
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distribution.
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in the ``ispc`` distribution.
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::
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::
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icc -mmic -Iexamples/intrinsics/ foo.cpp -o foo.o
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icc -mmic -Iexamples/intrinsics/ foo.cpp -o foo.o
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With the current beta implementation, complex ``ispc`` programs are able to
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With the current beta implementation, complex ``ispc`` programs are able to
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run on Xeon Phi, though there are a number of known limitations:
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run on Knights Corner, though there are a number of known limitations:
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* The ``examples/intrinsics/knc.h`` header file isn't complete yet; for
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* The ``examples/intrinsics/knc.h`` header file isn't complete yet; for
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example, vector operations with ``int8`` and ``int16`` types aren't yet
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example, vector operations with ``int8`` and ``int16`` types aren't yet
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@@ -597,8 +599,9 @@ run on Xeon Phi, though there are a number of known limitations:
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* If you use the ``launch`` functionality to launch tasks across cores,
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* If you use the ``launch`` functionality to launch tasks across cores,
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note that the pthreads task system implemented in
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note that the pthreads task system implemented in
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``examples/tasksys.cpp`` hasn't been tuned for Xeon Phi yet, and has
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``examples/tasksys.cpp`` offers several implemenetations for Knights
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known issues with setting thread affinities optimally.
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Corner. You will need to experiment to understand which one is most
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appropriate for your workload.
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* The compiler currently emits unaligned memory accesses in many cases
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* The compiler currently emits unaligned memory accesses in many cases
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where the memory address is actually aligned. This may unnecessarily
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where the memory address is actually aligned. This may unnecessarily
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@@ -617,12 +620,13 @@ run on Xeon Phi, though there are a number of known limitations:
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All of these issues are currently actively being addressed and will be
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All of these issues are currently actively being addressed and will be
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fixed in future releases.
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fixed in future releases.
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If you do use the current version of ``ispc`` on Xeon Phi, please let us
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If you do use the current version of ``ispc`` on Knights Corner,
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know of any bugs or unexpected results. (Also, any interesting results!).
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please let us know of any bugs or unexpected results. (Also, any
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*Note that access to Xeon Phi and public discussion of Xeon Phi performance
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interesting results!). *Note that access to Intel® Xeon Phi™
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is still governed by NDA*, so please send email to "matt dot pharr at intel
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processor and public discussion of Intel® Xeon Phi™ processor
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dot com" for any issues that shouldn't be filed in the `public ispc bug
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performance is still governed by NDA*, so please send email to "matt
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tracker`_.
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dot pharr at intel dot com" for any issues that shouldn't be filed in
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the `public ispc bug tracker`_.
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.. _public ispc bug tracker: https://github.com/ispc/ispc/issues
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.. _public ispc bug tracker: https://github.com/ispc/ispc/issues
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