Compilers are written as a pipeline: in particular, instruction selection and register allocation are different phases. GHC, for instance, uses maximal munch for instruction selection and a variety of register allocators. However, on x86-64 (for instance), register allocation constrains the particular instruction encodings, which affects the cost of some instructions.
APL is truly different from other languages; nearly every language uses lexical scoping to express composition. Both GHC Haskell and GCC/Clang use a stack for variables across procedures because it models how variables become available (FIFO). Putatively different languages are constrained by the same fundamentals.
LLVM is widely used for compilers (rustc, Swift, Kitten), particularly in tutorials (kaleidoscope), but it need not be a default.
We can find all (Haskell) libraries linked against the final executable with:
Dimension is a functor. This is true for points in space as well as arrays (more concretely).next