Blogs

In this article we will go through the steps required to setup Linux on the PandaBoard using files supplied from Linaro and also the further steps required to setup Linux for use with Development Studio…

The modern web is built primarily from three technologies: HTML, CSS and JavaScript. It is JavaScript that drives the interactive web; slow JavaScript means slow web pages. So today, a huge amount of effort…

In my first blog, we examined gave the historical context of the instruction set battles of ARM and x86, covering the RISC-CISC Wars in the PrePC Era and the PC Era. This blog covers Round 3, the PostPC…

This two-part blog gives a historical perspective on the ARM vs. 80x86 instruction set competition for three eras: PrePC (late 1970s/early 1980s), PC (mid 1980s to mid 2000s), and PostPC (late 2000s onward…

The 2010 ARM Technology Conference (Techcon) is taking place in Santa Clara next week. A large number of companies will be presenting their solutions to support development and optimization of products…

Wow it's that time again; our 4th release of Ubuntu on ARM is upon us. In the past we have provided a Freescale iMX51 image, a Marvell Dove image and a TI OMAP 3 image for Beagle Boards. This cycle…

This post is part of a series:Condition Codes 1: Condition Flags and CodesCondition Codes 2: Conditional ExecutionCondition Codes 3: Conditional Execution in Thumb-2Condition Codes 4: Floating-Point Comparison…

In the last article, I explained how to modify SWP code to make use of compiler intrinsics.  Using intrinsics hides the underlying detail needed to use the load and store exclusive instructions (LDREX…

Before ARMv6, the main synchronisation mechanism was the SWP instruction. SWP has two aspects, in a uniprocessor system it allows the read and write operations not to be interrupted between them.   In…

Once you move beyond short sequences of optimised Arm assembler, the next likely step will be to managing more complex, optimised routines using macros and functions.

This post aims to provide a simple introduction to Arm assembly language.

Ideally caches act as magic make-it-go-faster logic sitting between processor cores and memory banks. But there are cases where cache behaviour must be considered to get the desired result.

This is the first part of a series on how to write SIMD code for Neon using assembly language. It covers getting started with Neon, using it efficiently, and more.

Sitting in the airport at the end of a week's business trip to the US, I reflected back on the week.  It turned out that my colleague on this trip has an even worse sense of direction than myself.…

In this post, we deal with an often encountered problem: input data that is not a multiple of the length of the vectors you want to process.

Arm implements conditional execution using a set of flags which store state information about a previous operation. in this post I shed some light on the operation of these flags.

This post will show you how we can deal with these limitations and how the latest revision of the Arm architecture (Armv7) provides a simple and efficient solution.

In this post, we will look at how to efficiently multiply four-by-four matrices together, an operation frequently used in the world of 3D graphics.

This blog is a tutorial on detecting overflow from MUL.

It was always about the code (and where it would be used!) When I was a software developer I would often find that the project team I was in would try to guess how many devices the code would eventually…

Armv8 deprecates the use of the it instruction to make anything other than a single 16-bit instruction conditional. This affects many of the examples in this post.