If it's a pain, I have written an inline assembler for Nim that supports advanced patterns:
Codegen: <https://github.com/mratsim/constantine/blob/50717d8/constantine/primitives/macro_assembler_x86.nim> Example usage: <https://github.com/mratsim/constantine/blob/50717d8/constantine/arithmetic/assembly/limbs_asm_x86.nim> More advanced example in: <https://github.com/mratsim/constantine/tree/50717d8/constantine/arithmetic/assembly> At one point I'll try to create a proper package for it and also support ARM codegen but I certainly don't look forward to documenting GCC/Clang inline assembly syntax.
