diff options
Diffstat (limited to 'design/stack_machine.v')
| -rw-r--r-- | design/stack_machine.v | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/design/stack_machine.v b/design/stack_machine.v index 150f6c7..b6c2706 100644 --- a/design/stack_machine.v +++ b/design/stack_machine.v @@ -220,6 +220,10 @@ module stack_machine_new assign instr_mul = !set_im && !use_im && stack_shrinks_by_1 && instruction[11:0] == 12'd3; + wire instr_cond_jump; + assign instr_cond_jump = use_im && stack_shrinks_by_1 && + instruction[11:7] == 5'd1; + reg halt; /* Set once a halt instruction is encountered */ assign finished = halt; @@ -519,6 +523,13 @@ module stack_machine_new if (instr_mul && arithmetic_uncompleted) r1 <= r0 * r1; + + if (instr_cond_jump && arithmetic_uncompleted) begin + r1 <= r0; + + if (r1) + `SET_PC(im_effective); + end end // case: STEP_EXECUTING endcase // case (step) end // else: !if(RST_I) |