|
|
|
|
|
<?xml version="1.0" encoding="UTF-8"?>
|
|
|
|
|
|
<!--
|
|
|
|
|
|
Copyright (c) 2017 OpenPOWER Foundation
|
|
|
|
|
|
|
|
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
|
|
|
|
you may not use this file except in compliance with the License.
|
|
|
|
|
|
You may obtain a copy of the License at
|
|
|
|
|
|
|
|
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
|
|
|
|
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
|
|
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
|
|
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
|
|
|
|
See the License for the specific language governing permissions and
|
|
|
|
|
|
limitations under the License.
|
|
|
|
|
|
|
|
|
|
|
|
-->
|
|
|
|
|
|
<section xmlns="http://docbook.org/ns/docbook"
|
|
|
|
|
|
xmlns:xi="http://www.w3.org/2001/XInclude"
|
|
|
|
|
|
xmlns:xlink="http://www.w3.org/1999/xlink"
|
|
|
|
|
|
version="5.0"
|
|
|
|
|
|
xml:id="sec_how_findout">
|
|
|
|
|
|
<title>How did I find this out?</title>
|
|
|
|
|
|
|
|
|
|
|
|
<para>The next question is where did I get the details above. The GCC
|
|
|
|
|
|
documentation for <emphasis role="bold"><literal>__builtin_ia32_loadupd</literal></emphasis>
|
|
|
|
|
|
provides minimal information (the
|
|
|
|
|
|
builtin name, parameters and return types). Not very informative. </para>
|
|
|
|
|
|
|
|
|
|
|
|
<para>Looking up the Intel intrinsic description is more informative. You
|
|
|
|
|
|
can Google the intrinsic name or use the
|
|
|
|
|
|
<link xlink:href="https://software.intel.com/sites/landingpage/IntrinsicsGuide/">Intel
|
|
|
|
|
|
Intrinsic guide</link> for this. The Intrinsic Guide is interactive and
|
|
|
|
|
|
includes Intel (Chip) technology and text based search capabilities. Clicking
|
|
|
|
|
|
on the intrinsic name opens to a synopsis including; the underlying instruction
|
|
|
|
|
|
name, text description, operation pseudo code, and in some cases performance
|
|
|
|
|
|
information (latency and throughput).</para>
|
|
|
|
|
|
|
|
|
|
|
|
<para>The key is to get a description of the intrinsic (operand fields and
|
|
|
|
|
|
types, and which fields are updated for the result) and the underlying Intel
|
|
|
|
|
|
instruction. If the Intrinsic guide is not clear you can look up the
|
|
|
|
|
|
instruction details in the
|
|
|
|
|
|
“<link xlink:href="https://software.intel.com/en-us/articles/intel-sdm">Intel® 64 and IA-32
|
|
|
|
|
|
Architectures Software Developer’s Manual</link>”.</para>
|
|
|
|
|
|
|
|
|
|
|
|
<para>Information about the PowerISA vector facilities is found in the
|
|
|
|
|
|
<link xlink:href="https://openpowerfoundation.org/?resource_lib=ibm-power-isa-version-2-07-b">PowerISA Version 2.07B</link> (for POWER8 and
|
|
|
|
|
|
<link xlink:href="https://www.docdroid.net/tWT7hjD/powerisa-v30.pdf.html">3.0 for
|
|
|
|
|
|
POWER9</link>) manual, Book I, Chapter 6. Vector Facility and Chapter 7.
|
|
|
|
|
|
Vector-Scalar Floating-Point Operations. Another good reference is the
|
|
|
|
|
|
<link xlink:href="https://openpowerfoundation.org/technical/technical-resources/technical-specifications/">OpenPOWER ELF V2 application binary interface</link> (ABI)
|
|
|
|
|
|
document, Chapter 6. Vector Programming Interfaces and Appendix A. Predefined
|
|
|
|
|
|
Functions for Vector Programming.</para>
|
|
|
|
|
|
|
|
|
|
|
|
<para>Another useful document is the original <link xlink:href="http://www.nxp.com/assets/documents/data/en/reference-manuals/ALTIVECPEM.pdf">Altivec Technology Programmers Interface Manual</link>
|
|
|
|
|
|
with a user friendly structure and many helpful diagrams. But alas the PIM does does not
|
|
|
|
|
|
cover the recent PowerISA (power7, power8, and power9) enhancements.</para>
|
|
|
|
|
|
|
|
|
|
|
|
</section>
|
|
|
|
|
|
|
