I added a functional unit to the MIPS 5kc backend for memory operations and noticed that a function started getting mtlo / mflo instructions in the prologue/epilogue. The function does not have any mult/div instructions. When I debug the source of these instructions, I can only tap into the code path when GCC is looking for the instruction suiting the RTL pattern (final.c). Why are these instructions being generated when I simply just added a functional unit to the pipeline description ? How can I debug why they are being generated in the first place ? Thanks
