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memory.h
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memory.h
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//memcopy
// copys memory from one place to another the places may overlap
// parameter
// 3: source
// 2: dest
// 1: length
// local variables
// 1: source pointer
// 2: dest pointer
// 3: left count
ws_label(memcopy);
ws_label(mem_copy);
ws_label(mem_move);
ws_push(3);
ws_swap();
ws_store();
// left count
ws_push(2);
ws_swap();
ws_store();
// dest pointer
ws_push(1);
ws_swap();
ws_store();
// source pointer
ws_push(3); ws_fetch();
ws_jzn(memcopy_end);//no more left
ws_push(1); ws_fetch();
ws_push(2); ws_fetch();
ws_sub();
ws_jz(memcopy_end);//source = dest
ws_push(1); ws_fetch();
ws_push(2); ws_fetch();
ws_sub();
ws_jn(memcopy_loop_dest_greater_source_begin);
ws_jump(memcopy_loop_source_greater_dest);
ws_label(memcopy_loop_source_greater_dest);
ws_push(2);
ws_fetch();
ws_push(1);
ws_fetch();
ws_fetch();
ws_store();
ws_push(2);
ws_push(2);
ws_fetch();
ws_push(1);
ws_add();
ws_store();
ws_push(1);
ws_push(1);
ws_fetch();
ws_push(1);
ws_add();
ws_store();
ws_push(3);
ws_push(3);
ws_fetch();
ws_push(1);
ws_sub();
ws_store();
ws_push(3); ws_fetch();
ws_jz(memcopy_end);
ws_jump(memcopy_loop_source_greater_dest);
ws_label(memcopy_loop_dest_greater_source_begin);
// dest > source so we need to go backwards throug the memory
ws_push(2);
ws_push(2);
ws_fetch();
ws_push(3);
ws_fetch();
ws_add();
ws_push(1);
ws_sub();
ws_store();
ws_push(1);
ws_push(1);
ws_fetch();
ws_push(3);
ws_fetch();
ws_add();
ws_push(1);
ws_sub();
ws_store();
ws_label(memcopy_loop_dest_greater_source);
ws_push(2);
ws_fetch();
ws_push(1);
ws_fetch();
ws_fetch();
ws_store();
ws_push(2);
ws_push(2);
ws_fetch();
ws_push(1);
ws_sub();
ws_store();
ws_push(1);
ws_push(1);
ws_fetch();
ws_push(1);
ws_sub();
ws_store();
ws_push(3);
ws_push(3);
ws_fetch();
ws_push(1);
ws_sub();
ws_store();
ws_push(3); ws_fetch();
ws_jz(memcopy_end);
ws_jump(memcopy_loop_dest_greater_source);
ws_label(memcopy_end);
ws_return();
// parameter
// [1] from
// [2] count
ws_label(mem_zero);
ws_label(mem_zero_start);
//from->count
ws_dup();
ws_jz(mem_zero_end);
ws_swap();//count->from
ws_dup();
ws_push(0);
ws_store();
ws_push(1);
ws_add();
ws_swap();//from->count
ws_push(1);
ws_sub();
ws_jump(mem_zero_start);
ws_label(mem_zero_end);
ws_drop();
ws_drop();
ws_return();
// nummeriere speicher von [1] - [2] // for debuging
ws_label(numeriere);
ws_push(2);
ws_swap();
ws_store();
ws_push(1);
ws_swap();
ws_store();
ws_push(1);
ws_fetch();
ws_label(numeriere_start);
ws_dup();
ws_dup();
ws_store();
ws_push(1);
ws_add();
ws_dup();
ws_push(2);
ws_fetch();
ws_sub();
ws_jz(numeriere_end);
ws_jump(numeriere_start);
ws_label(numeriere_end);
ws_drop();
ws_return();