%}
%start begin
-%term O_RET=1 O_NOT=2 O_SUB=3 O_MUL=4 O_OR=5 O_LESS=6 O_EQ=7 O_ID=8
+%term O_RET=1 O_NOT=2 O_SUB=3 O_MUL=4 O_OR=5 O_LESS=6 O_EQ=7 O_ID=8 O_ADD=9
%%
begin: ret # 0 # printf("// end\n");
ret: O_RET(expr) # 1 # move(bnode->reg, "rax"); ret();
-expr: O_ID # 1 # if(bnode->param_index!=0) move(param_reg(bnode->param_index), bnode->reg);
+expr: O_ID # 1 # if(bnode->param_index > -1) move(param_reg(bnode->param_index), bnode->reg);
+expr: O_SUB(expr,expr) # 1 # printf("\tsubq %%%s, %%%s\n", bnode->kids[0]->reg, bnode->kids[1]->reg);
+expr: O_ADD(expr,expr) # 1 # printf("\taddq %%%s, %%%s\n", bnode->kids[1]->reg, bnode->kids[0]->reg);
%%