Hello,
for a custom architecture I am working on, I would like to entirely disable the usage of hardware floating point instructions in favor of library methods on demand. I need advice on what is the best strategy to do this. My idea is to: - create a new flag (let's say -m[no-]float-insn or something like that - use the value of the flag in the condition of every define_insn in the machine description to inhibit their usage if the flag is active My questions: - Is this a good strategy? Or would you suggest a better solution? - If I switch all floating point instructions off, will GCC automatically use their software counterpart, from the builtins or libraries, by finding them via their instruction patterns? - I noticed that some opcodes of our architecture can be found in the assembler, but they are not available in the GCC backend. How can I inhibit the usage of those instructions? Shall I explicitly add to the machine description and then disable them with their condition? Thank you for your suggestions. I am new in this (difficult) business and I am trying to learn. Kind regards Enrico Bragante
