redriver jiang <jiang.redri...@gmail.com> writes: > Hi, > > You mean I should define insn like this: > > (define_insn "*iorqi3_imm" > [(set (mem:QI (match_operand:HI 0 "register_operand" "b")) > (ior:QI (mem:QI (match_operand:HI 1 "register_operand" "b") > (mem:QI (plus: HI (match_operand:HI 2 > "register_operand" "f") > (match_operand: 3 HI > "immediate_operand" "K") ))))] > "" > "..." > [( set_attr "length" "1" )]) > > "b" for R16,R17,R18, and "f" for R18, "K" for immediate operand with > range "0-127"?
Sort of, but you shouldn't write the PLUS in the insn. Instead, write a new constraint which accepts either a R16, R17, or R18 plus an offset. Also, write the insn with three alternatives, with the offset constraint in each position. Ian
