The Compiler Doesn’t Care About Your Intent

A misunderstanding that I sometimes run into when teaching programming is that the compiler can and should guess what the programmer means.  This isn’t usually quite what people say, but it’s what they’re thinking.  A great example appeared in a message sent to the avr-gcc mailing list.  The poster had upgraded his version of GCC, […]

C and C++ Make It Hard to Read a Register for Its Side Effects

[ This post was co-written with Nigel Jones, who maintains an excellent embedded blog Stack Overflow.  Nigel and I share an interest in volatile pitfalls in embedded C/C++ and this post resulted from an email discussion we had.  Since we both have blogs, we decided to both post it.   However, since comments are not enabled […]

The Dreaded LPU

In academic publishing, the “least publishable unit,” or LPU, refers to the smallest contribution to scientific knowledge that can be successfully sneaked past the reviewers at a conference or journal.  Most often the term is used derisively, though I have sometimes heard it used as a modest complement, indicating that a researcher has astutely determined […]

A New Life Awaits You in the Off-World Colonies

As a recipient of research funding from the US government, I sometimes think about how this resource should be allocated.  Wikipedia claims that for most developed countries, research funding amounts to 1.5% to 3% of GDP, so we are talking about a lot of money here.  Appropriate focusing of this funding can change the world […]

Computer Science Fiction

Science fiction explores the effect of technological progress on society.  It is ironic, then, that the majority of SF authors miserably failed to predict the impact of computers and information technology. Why does Google return no meaningful hits for “computer science fiction?”  Is it not obvious that this term needs to exist, if we wish […]

Nine ways to break your systems code using volatile

The volatile qualifier in C/C++ is a little bit like the C preprocessor: an ugly, blunt tool that is easy to misuse but that — in a very narrow set of circumstances — gets the job done.  This article will first briefly explain volatile and its history and then, through a series of examples about […]

Is That a Compiler Bug?

It’s common for a computer program to display behavior seemingly unrelated to its source code.  Additionally, programs written in C/C++ frequently change their behavior when the compiler optimization options are changed.  This post is a quick guide to figuring out if the compiler is at fault.  This post was motivated by a blog post by […]