corrects gen_sync update order, improves illegal instruction

gen_input/templates/llvm/CORENAME.cpp.gtl

@@ -170,13 +170,13 @@ private:
         auto cur_pc_val = this->gen_const(32,pc.val);
         pc=pc+ ${instr.length/8};
         this->gen_set_pc(pc, traits::NEXT_PC);
-        this->set_tval(PC);
+        this->set_tval(instr);
 
         /*generate behavior*/
         <%instr.behavior.eachLine{%>${it}
         <%}%>
-        this->gen_instr_epilogue(bb);
         this->gen_sync(POST_SYNC, ${idx});
+        this->gen_instr_epilogue(bb);
         this->builder.CreateBr(bb);
     	return returnValue;        
     }
@@ -185,6 +185,15 @@ private:
      * end opcode definitions
      ****************************************************************************/
     std::tuple<continuation_e, BasicBlock *> illegal_instruction(virt_addr_t &pc, code_word_t instr, BasicBlock *bb) {
+        if(this->disass_enabled){
+            auto mnemonic = std::string("illegal_instruction");
+            std::vector<Value*> args {
+                this->core_ptr,
+                this->gen_const(64, pc.val),
+                this->builder.CreateGlobalStringPtr(mnemonic),
+            };
+            this->builder.CreateCall(this->mod->getFunction("print_disass"), args);
+        }
 		this->gen_sync(iss::PRE_SYNC, instr_descr.size());
         this->builder.CreateStore(this->builder.CreateLoad(this->get_typeptr(traits::NEXT_PC), get_reg_ptr(traits::NEXT_PC), true),
                                    get_reg_ptr(traits::PC), true);
@@ -193,6 +202,7 @@ private:
                                      this->gen_const(64U, 1)),
             get_reg_ptr(traits::ICOUNT), true);
         pc = pc + ((instr & 3) == 3 ? 4 : 2);
+        this->set_tval(instr);
         this->gen_raise_trap(0, 2);     // illegal instruction trap
 		this->gen_sync(iss::POST_SYNC, instr_descr.size());
         this->gen_instr_epilogue(this->leave_blk);
@@ -341,7 +351,6 @@ inline void vm_impl<ARCH>::set_tval(Value* new_tval) {
 template <typename ARCH> 
 void vm_impl<ARCH>::gen_trap_behavior(BasicBlock *trap_blk) {
     this->builder.SetInsertPoint(trap_blk);
-    this->gen_sync(POST_SYNC, -1); //TODO get right InstrId
     auto *trap_state_val = this->builder.CreateLoad(this->get_typeptr(traits::TRAP_STATE), get_reg_ptr(traits::TRAP_STATE), true);
     this->builder.CreateStore(this->gen_const(32U, std::numeric_limits<uint32_t>::max()),
                               get_reg_ptr(traits::LAST_BRANCH), false);