SIMD.js is a new API for performing SIMD (Single Instruction Multiple Data) computations in JavaScript which is being developed by Google, Intel, Mozilla, and others. For example, it defines a new Float32x4 type which represents 4 float32 values packed up … Continue reading
Firefox 32 Firefox uses two just-in-time compilers: Baseline and IonMonkey. When a web page contains some JavaScript code, this code is first executed in the interpreter. Then after running the same code multiple times, we compile the code with Baseline. … Continue reading
There are several different ways to represent floating-point numbers in computers: most architectures now use the IEEE754 standards, representing double precision numbers with 64 bits (a.k.a double, or float64) and single precision numbers with 32 bits (a.k.a float32). As its … Continue reading
One of the primary goals of JIT engines for dynamic languages is to make high-level code run fast by compiling it into efficient machine code. A key property of this, however, is that the compiled code for any piece of … Continue reading
Luke Wagner recently completed an overhaul of the way SpiderMonkey accesses variables, especially closure variables, to make everything simpler and faster. He blogged about it on his personal blog, complete with “how this would be written in JS” code snippets: … Continue reading
