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<?xml version="1.0" encoding="UTF-8"?> |
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<!-- |
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Copyright (c) 2017 OpenPOWER Foundation |
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Licensed under the Apache License, Version 2.0 (the "License"); |
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you may not use this file except in compliance with the License. |
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You may obtain a copy of the License at |
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http://www.apache.org/licenses/LICENSE-2.0 |
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Unless required by applicable law or agreed to in writing, software |
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distributed under the License is distributed on an "AS IS" BASIS, |
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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See the License for the specific language governing permissions and |
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limitations under the License. |
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--> |
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<chapter xmlns="http://docbook.org/ns/docbook" |
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xmlns:xi="http://www.w3.org/2001/XInclude" |
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xmlns:xlink="http://www.w3.org/1999/xlink" |
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version="5.0" |
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xml:id="ch_intel_intrinsic_porting"> |
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<title>Intel Intrinsic porting guide for Power64LE</title> |
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<para>The goal of this project is to provide functional equivalents of the |
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Intel MMX, SSE, and AVX intrinsic functions, that are commonly used in Linux |
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applications, and make them (or equivalents) available for the PowerPC64LE |
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platform. These X86 intrinsics started with the Intel and Microsoft compilers |
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but were then ported to the GCC compiler. The GCC implementation is a set of |
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headers with inline functions. These inline functions provide an implementation |
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mapping from the Intel/Microsoft dialect intrinsic names to the corresponding |
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GCC Intel built-ins or directly via C language vector extension syntax.</para> |
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<para>The current proposal is to start with the existing X86 GCC intrinsic |
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headers and port them (copy and change the source) to POWER using C language |
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vector extensions, VMX and VSX built-ins. Another key assumption is that we |
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will be able to use many of the existing Intel DejaGNU test cases in |
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./gcc/testsuite/gcc.target/i386. This document is intended as a guide to |
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developers participating in this effort. However this document provides |
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guidance and examples that should be useful to developers who may encounter X86 |
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intrinsics in code that they are porting to another platform.</para> |
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<note><para>(<emphasis>We have started contributions of X86 intrinsic headers |
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to the GCC project.</emphasis>) The current status of the project is the BMI |
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(bmiintrin.h), BMI2 (bmi2intrin.h), MMX (mmintrin.h), and SSE (xmmintrin.h) |
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intrinsic headers are committed to GCC development trunk for GCC 8. |
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Work on SSE2 (emmintrin.h) is in progress. |
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</para></note> |
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<xi:include href="sec_review_source.xml"/> |
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</chapter> |
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