Has been looking at different methods like using a look-up table or double-dabble, but have up to this moment not found any algoritm that do the work most effectively. The 64 bit value is delivered to the routine in two 32 bits registers (upper,lower). I am writing a larger project for PIC 32 microcontroller, and have already made a large library for this controller in MIPS, so I know basic MIPS.

Re: MIPS 64 bit decimal to ascii string 80 80

I've worked with MicroChip PIC 32 before. We used a C compiler. Luck has it that the code to do double-dabble is done.
Example: https://en.wikipedia.org/wiki/Double_dabble

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