Hello, I think you should add the pair of constraints m and I respectively to the description of the instruction in your md file (and a relevant case 8 to handle such instruction), i.e.:
(define_insn "movqi" - [(set (match_operand:QI 0 "nonimmediate_operand" "=p,q,m,m,p,q,p,q") - (match_operand:QI 1 "general_operand" "m,m,p,q,p,q,I,I"))] + [(set (match_operand:QI 0 "nonimmediate_operand" "=p,q,m,m,p,q,p,q,m") + (match_operand:QI 1 "general_operand" "m,m,p,q,p,q,I,I,I"))] "" "* switch(which_alternative) @@ -17,6 +17,8 @@ case 6: case 7: return \"l.addi \\t%0,r0,%1\\t # move immediate\";, + case 8: + return ...; default: return \"invalid alternative\"; } It seems that the pair m and I is missing (which indicate the memory = constant instruction). You could look for which_alternative variable in GCC internals for more details on this. Revital