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= Cortex-A String Routines =
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This package contains optimised string routines including memcpy(), memset(),
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strcpy(), strlen() for the ARM Cortex-A series of cores.
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Various implementations of these routines are provided, including generic
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implementations for ARMv7-A cores with/without Neon, an implementation tuned
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for Cortex-A9 and generic implementations for cores supporting AArch64.
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First configure and then install libcortex-strings.so. To make other
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applications use this library, either add -lcortex-strings to the link
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command or use LD_PRELOAD to load the library into existing applications.
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Our intent is to get these routines into the common C libraries such
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as GLIBC, Bionic, and Newlib. Your system may already include them!
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* src/ contains the routines themselves
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* tests/ contains the unit tests
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* reference/ contains reference copies of other ARM-focused
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implementations gathered from around the Internet
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* benchmarks/ contains various benchmarks, tools, and scripts used to
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check and report on the different implementations.
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The src directory contains different variants organised by the
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implementation they run on and optional features used. For example:
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* src/thumb-2 contains generic non-NEON routines for AArch32 (with Thumb-2).
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* src/neon contains NEON based routines for AArch32.
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* src/linaro-a9 contains tuned routines for Cortex-A9 processors.
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* src/aarch64 contains generic routines for AArch64.
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== Reference versions ==
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reference/ contains versions collected from various popular Open
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Source libraries. These have been modified for use in benchmarking.
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Please refer to the individual files for any licensing terms.
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The routines were collected from the following releases:
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* Bionic android-2.3.5_r1
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All Linaro-authored routines are under the modified BSD license:
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Copyright (c) 2011, Linaro Limited
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of the Linaro nor the
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names of its contributors may be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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All third party routines are under a GPL compatible license.
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== Notes and Limitations ==
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Some of the implementations have been collected from other
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projects and have a variety of licenses and copyright holders.
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Assembly code attempts to follow the GLIBC coding convetions. They
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* Copyright headers in C style comment blocks
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* Instructions indented with one tab
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* Operands indented with one tab
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* Text is wrapped at 70 characters
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* End of line comments are fine
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