Dear all, I've been trying to define this instruction but am having difficulties. This instruction does 3 things: - Updates an internal accumulator (depending on two arguments) - Returns the value of that update in an output register - Updates the internal accumulator after that
I first wrote : (define_insn "myInst" [ (set (match_operand:DI 0 "register_operand" "=r") (unspec:DI [(match_operand:DI 1 "register_operand" "r") (match_operand:DI 2 "register_operand" "r") (reg:DI 66)] 5)) (clobber (reg:DI 66)) ] "" "myInst\\t%0,%1,%2" [(set_attr "type" "arith") (set_attr "mode" "DI") (set_attr "length" "1")]) Therefore saying that the unspec was dependent on the accumulator and the two values and that the result was operand 0. I added a clobber to the accumulator to say: it's been changed. However, now if I have two myInst, the first gets optimized out... I therefore need to define this instruction differently, any ideas ? Thanks a lot, Jean Christophe Beyler
