Definition
Plain language
A chip technique for doing the same operation on many pieces of data at once, to run faster.
As stated in the literature
Single Instruction, Multiple Data — a parallel execution model where one instruction operates over a vector of values simultaneously; the WebAssembly SIMD spec appears as an agent verification task, and SIMD instructions are a target of GPU-kernel optimization.
Why it matters: By doing the same operation across lots of data at once, it dramatically speeds up number-heavy work like graphics and AI computations.
For example, instead of adding a thousand pairs of numbers one at a time, SIMD adds a whole batch of them in a single step.
Heard on the show
“The task is to build a validator for the WebAssembly SIMD spec — software that decides whether a given module is valid or invalid, checked against nearly thirty-two thousand spec assertions.”Episode 125 — AI Coding Agents Run a Marathon, and Fewer Than One in Three Finish