This file defines the class FunctionDAG, which is our representation of a Halide pipeline, and contains methods to using Halide's bounds tools to query properties of it.
Base classes for Halide expressions (Halide::Expr) and statements (Halide::Internal::Stmt) ...
Not visible externally, similar to 'static' linkage in C.
Stmt trim_no_ops(Stmt s)
Truncate loop bounds to the region over which they actually do something.