diff options
Diffstat (limited to 'design')
| -rw-r--r-- | design/stack_machine.v | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/design/stack_machine.v b/design/stack_machine.v index d0ca36b..04b1285 100644 --- a/design/stack_machine.v +++ b/design/stack_machine.v @@ -183,9 +183,14 @@ module stack_machine_new assign instr_set_sp = use_im && stack_same_size && instruction[11:7] == 5'd0; - /* Instructions, that grom stack */ + /* Instructions, that grow stack */ + wire instr_tee; + assign instr_tee = !set_im && !use_im && stack_grows && + instruction[11:0] == 12'd0; + wire instr_const; - assign instr_const = use_im && stack_grows && instruction[11:7] == 5'd0; + assign instr_const = use_im && stack_grows && + instruction[11:7] == 5'd0; /* Instructions, that shrink stack */ /* none now */ @@ -423,6 +428,9 @@ module stack_machine_new if (instr_const && first_execution_tick) r1 <= im_effective; + if (instr_tee) + r1 <= r1; + if (instr_set_sp) `SET_SP(im_effective); end // case: STEP_EXECUTING |