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@@ -22,6 +22,17 @@ has an LP64 data model, meaning that `long` and pointer types will be added in the future to support [64-bit address spaces](FutureFeatures.md#linear-memory-bigger-than-4-gib). +`float` and `double` are the IEEE 754-2008 single- and double-precision types, +which are native in WebAssembly. `long double` is the IEEE 754-2008 +quad-precision type, which is a software-emulated type. WebAssembly does +not have a builtin quad-precision type. Quad-precision is not part of +the WebAssembly platform itself. There are no quad-precision operators +built into WebAssembly. The long double type here is software-emulated +in library code linked into WebAssembly applications that need it. + +For performance and compatibility with other platforms, `float` and +`double` are recommended for most uses. + ### Language Support C and C++ language conformance is largely determined by individual compiler |