|over 8 years ago||5 days ago|
|MIT License||MIT License|
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We haven't tracked posts mentioning Lua yet.
Tracking mentions began in Dec 2020.
Optimizations Enabled by -ffast-Math
1 project | news.ycombinator.com | 20 Oct 2021
Fast math optimizations can break code like this by breaking isNaN.
I was porting a C++ project to a certain platform - and that platform enabled a -ffast-math equivalent by default in Release (but not Debug) builds! This broke duktape, a JS engine said project embedded, in some nasty and subtle ways. Instead of storing a number/pointer/??? (8 bytes) + type tag (4? bytes) for each dynamically typed JS value, duktape can bit-pack values into a single 8 byte "double" value by storing object/string handles as NaN values - this isn't an uncommon trick for dynamically typed scripting stuff:
Naturally, the -ffast-math equivalent broke isNaN checks, which caused random object/string handles to be mistakenly reinterpreted as "numbers" - but only in Release builds, for this one particular platform, in one rarely taken branch, so neither QA nor CI caught it, leading to hours of manufacturing a repro case, stepping through an absurd amount of code, and then finally looking at the default build rules and facepalming.
Cursing the platform vendor under my breath, I overrode the defaults to align with the defaults of every other config x platform combination we already had: no fast math. If you want those optimizations, use SSE-friendly NaN-avoiding intrinsics - or, if you must use the compiler flags, ensure you do so consistently across build configs and platforms, perhaps limited to a few TUs or modules if possible. This allows you to have a chance at using your Debug builds to debug the resulting "optimizations".
Can C++ and JS be used together?
1 project | reddit.com/r/learnprogramming | 27 Apr 2021
- Duktape (4.8k stars)
What are some alternatives?
ChaiScript - Embedded Scripting Language Designed for C++
V8 - The official mirror of the V8 Git repository
Wren - The Wren Programming Language. Wren is a small, fast, class-based concurrent scripting language.
sol2 - Sol3 (sol2 v3.0) - a C++ <-> Lua API wrapper with advanced features and top notch performance - is here, and it's great! Documentation:
SWIG - SWIG is a software development tool that connects programs written in C and C++ with a variety of high-level programming languages.
luacxx - C++11 API for creating Lua bindings
squirrel - Official repository for the programming language Squirrel