Greg McGary <g...@mcgary.org> writes: > I have a port without div or mod machine instructions. I wrote > divmodsi4 patterns that do the libcall directly, hoping that GCC would > recognize the opportunity to use a single divmodsi4 to compute both > quotient and remainder. Alas, GCC calls divmodsi4 twice with the same > divisor and dividend operands. Is this supposed to work? Is there a > special trick to help the optimizer recognize the redundant insn? I > saw the 4yr-old thread regarding picochip's desire for the same effect > and followed the same approach implemented in the current picochip.md > (as well as my own approach) but no luck.
Using a divmodsi4 insn instead of divsi3/modsi3 insns ought to work. You may need to give more information, such as the test case you are using, and what your divmodsi4 insn looks like. Ian
