Assembly

For some reason, I need a fast method for string search. The LabVIEW Search/Split String function is relatively slow, I’ve done this using String Zilla, and achieved around a 20x boost with AVX2/AVX512.

I just encountered slow string performance in LabVIEW when a large string is passed to a DLL as a C string pointer. It is always better to pass it as ‘Adapt to Type’ instead of a pointer.

B&R PLC could be programmed with C and C++. But you can also use Assembly. Below short instruction how to do that.

In some cases we need to measure a very short intervals (hundreds of the CPU Tacts) directly in Assembler. We can perform measurement by using cpuid/rdtsc combination.

Nowadays development on pure Assembler is not very popular, because modern compilers can generate “good” code. On the other hand this is a very good exercise, which helps to understand a calling conventions and how it work in very low details.

Calling external code from different languages is great feature of LabVIEW. In general you can wrap almost anything into DLL, then call it by Call Library Function Node. This time we will mix Rust code with LabVIEW.