Funny: "It is not clear that any compiler will ever use this instruction — it looks like it is designed for Kazushige Goto‘s personal use." https://en.wikipedia.org/wiki/Kazushige_Goto
This sounds like exactly the instruction needed for the inner loop of xcorr_kernel(), the function at the heart of a bunch of algorithms used in the Opus codec. This falls under the "convolution kernel" use-case described in the article.