Today I expanded on the direct to backend compiler directives:
#emit puts the given string directly on the source code as a LinearOp
#funattr adds function attributes to the current function
#global puts the string into the top of the generated file
#local puts the string into the top of the current function
With these in place you can do things like adding linear assembly (useful to insert optimization fences or other shenanigans), hookup instrumentation, and to configure your functions as you would with a C compiler (add always_inline, force loop unrolls, put a function into a given section, etc.). I think these form a base that could work for most or all backends I can think of, so they are not limited to the current C one.
