| U16 | Feldspar.Compiler.Imperative.Frontend, Feldspar.Compiler |
| U32 | Feldspar.Compiler.Imperative.Frontend, Feldspar.Compiler |
| U40 | Feldspar.Compiler.Imperative.Frontend, Feldspar.Compiler |
| U64 | Feldspar.Compiler.Imperative.Frontend, Feldspar.Compiler |
| U8 | Feldspar.Compiler.Imperative.Frontend, Feldspar.Compiler |
| UndefinedLen | Feldspar.Compiler.Imperative.Representation, Feldspar.Transformation |
| Underlining | Feldspar.Compiler.Backend.C.Library |
| Unroll | Feldspar.Compiler.Backend.C.Options, Feldspar.Compiler |
| unroll | Feldspar.Compiler.Backend.C.Options, Feldspar.Compiler |
| Unroll1 | |
| 1 (Type/Class) | Feldspar.Compiler.Imperative.Plugin.Unroll |
| 2 (Data Constructor) | Feldspar.Compiler.Imperative.Plugin.Unroll |
| Unroll2 | |
| 1 (Type/Class) | Feldspar.Compiler.Imperative.Plugin.Unroll |
| 2 (Data Constructor) | Feldspar.Compiler.Imperative.Plugin.Unroll |
| unrollExternalInfo | Feldspar.Compiler.Compiler |
| unrollOptions | Feldspar.Compiler.Compiler, Feldspar.Compiler |
| UnrollPlugin | |
| 1 (Type/Class) | Feldspar.Compiler.Imperative.Plugin.Unroll |
| 2 (Data Constructor) | Feldspar.Compiler.Imperative.Plugin.Unroll |
| UnrollSemInf | Feldspar.Compiler.Imperative.Plugin.Unroll |
| UnrollStrategy | Feldspar.Compiler.Backend.C.Options, Feldspar.Compiler |
| Unsigned | Feldspar.Compiler.Imperative.Representation, Feldspar.Transformation |
| Up | Feldspar.Transformation.Framework, Feldspar.Transformation |
| up | Feldspar.Transformation.Framework, Feldspar.Transformation |
| up1 | Feldspar.Transformation.Framework, Feldspar.Transformation |
| usedExtensions | Feldspar.NameExtractor |
| UserType | |
| 1 (Data Constructor) | Feldspar.Compiler.Imperative.Representation, Feldspar.Transformation |
| 2 (Data Constructor) | Feldspar.Compiler.Imperative.Frontend, Feldspar.Compiler |