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https://gcc.gnu.org/ml/gcc-patches/2010-05/msg01315.html
Re: [PATCH, ARM] Misaligned access support for ARM Neon. From: Julian Brown <julian at codesourcery dot com>; To: gcc-patches at gcc dot gnu dot org; Cc: Richard Earnshaw <rearnsha at arm dot com>, Paul Brook <paul at codesourcery dot com>, Ira Rosen <IRAR at il dot ibm dot com>; Date: Tue, 18 May 2010 01:31:08 +0100; Subject: Re: [PATCH, ARM] Misaligned access support for ARM Neon
http://infocenter.arm.com/help/topic/com.arm.doc.faqs/ka15414.html
How does the ARM Compiler support unaligned accesses? Applies to: DS-5, RealView Development Suite (RVDS) Answer. Older ARM processors require data load and stores to be to/from architecturally aligned addresses.
http://infocenter.arm.com/help/topic/com.arm.doc.ddi0344c/Cihejdic.html
4.2.1. NEON data alignment This section describes NEON data access, alignment and the alignment qualifiers. Alignment specifiers In vector load and vector store operations, you can specify alignment requirements in the instruction. Alignment faults are generated based on both memory attributes and
https://stackoverflow.com/questions/5119496/arm-unaligned-memory-access-workaround
I have to port source code from to an ARM platform that runs Linux. Unfortunately I have run into unaligned memory access problems. The source uses pointer casts and access heavily. Code like the one below has spread over the codebase like a virus.
https://stackoverflow.com/questions/31176671/how-can-i-enable-unaligned-access-for-arm-neon-in-llvm-compiler
What is the flag to enable unaligned memory access for ARM NEON in LLVM compiler. I was testing my ARM NEON intrinsic program in Xcode. I am accessing data from unaligned memory: char TempMemory[3...
https://medium.com/@iLevex/the-curious-case-of-unaligned-access-on-arm-5dd0ebe24965
Dec 27, 2016 · The curious case of unaligned access on ARM. ... ARM didn’t support unaligned access in the expected way. ... Get unlimited access to the best stories on Medium — and support …Author: Levente Kurusa
http://llvm.1065342.n5.nabble.com/Unaligned-vector-memory-access-for-ARM-NEON-td48612.html
Sep 05, 2012 · Unaligned vector memory access for ARM/NEON. Hello all, I am a first time writer here, but am a happy LLVM tinkerer. It is a pleasure to use :). …
https://jsolano.net/2012/09/06/arm-unaligned-data-access-and-floating-point-in-linux/
I was recently getting Data Aborts on an ARM11 program that makes intensive use on unaligned data accesses. The issue was caused by unaligned floating point accesses, which were not handled by the Linux kernel. Some background on the problem follows. ARM unaligned data access hardware support ARM 32-bit instructions must always be word boundary…
https://en.wikipedia.org/wiki/ARM_NEON
Arm Flexible Access. On 16 July 2019, Arm announced Arm Flexible Access. Arm Flexible Access provides unlimited access to included Arm intellectual property (IP) for development. Per product licence fees are required once customers reaches foundry tapeout or prototyping. 75% of Arm's most recent IP over the last two years are included in Arm ...Bits: 32-bit, 64-bit
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66917
Created attachment 36009 Minimal example code that is miscompiled The attached C source code is mis-compiled by GCC 4.9.3 with -O3 and -mfpu=neon. Calls to memcpy between a uint8_t* parameter and a local variable are compiled into vld1.64 and vst1.64 instructions with an alignment field that specifies that the memory address (the uint8_t* parameter) is aligned on a 64-bit boundary, although ...
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