diff options
Diffstat (limited to 'design/stack_machine.v')
| -rw-r--r-- | design/stack_machine.v | 70 |
1 files changed, 69 insertions, 1 deletions
diff --git a/design/stack_machine.v b/design/stack_machine.v index b5c56e6..687168a 100644 --- a/design/stack_machine.v +++ b/design/stack_machine.v @@ -54,8 +54,13 @@ module stack_machine_new reg [31:0] r0; reg [31:0] r1; - reg [31:0] im; + wire signed [31:0] r0s; + wire signed [31:0] r1s; + assign r0s = r0; + assign r1s = r1; + + reg [31:0] im; reg im_initialized; parameter STEP_LOADING_INSTRUCTION = 1'b0; @@ -243,6 +248,42 @@ module stack_machine_new assign instr_drop = !set_im && !use_im && stack_shrinks_by_1 && instruction[11:0] == 12'd4; + wire instr_eq; + assign instr_eq = !set_im && !use_im && stack_shrinks_by_1 && + instruction[11:0] == 12'd7; + + wire instr_lt; + assign instr_lt = !set_im && !use_im && stack_shrinks_by_1 && + instruction[11:0] == 12'd8; + + wire instr_ult; + assign instr_ult = !set_im && !use_im && stack_shrinks_by_1 && + instruction[11:0] == 12'd9; + + wire instr_le; + assign instr_le = !set_im && !use_im && stack_shrinks_by_1 && + instruction[11:0] == 12'd10; + + wire instr_ule; + assign instr_ule = !set_im && !use_im && stack_shrinks_by_1 && + instruction[11:0] == 12'd11; + + wire instr_gt; + assign instr_gt = !set_im && !use_im && stack_shrinks_by_1 && + instruction[11:0] == 12'd12; + + wire instr_ugt; + assign instr_ugt = !set_im && !use_im && stack_shrinks_by_1 && + instruction[11:0] == 12'd13; + + wire instr_ge; + assign instr_ge = !set_im && !use_im && stack_shrinks_by_1 && + instruction[11:0] == 12'd14; + + wire instr_uge; + assign instr_uge = !set_im && !use_im && stack_shrinks_by_1 && + instruction[11:0] == 12'd15; + wire instr_ret; assign instr_ret = !set_im && !use_im && stack_shrinks_by_1 && instruction[11:0] == 12'b000010000000; @@ -583,6 +624,33 @@ module stack_machine_new `SET_PC(im_effective); end + if (instr_eq && arithmetic_uncompleted) + r1 <= r0 == r1; + + if (instr_lt && arithmetic_uncompleted) + r1 <= r0s < r1s; + + if (instr_ult && arithmetic_uncompleted) + r1 <= r0 < r1; + + if (instr_le && arithmetic_uncompleted) + r1 <= r0s <= r1s; + + if (instr_ule && arithmetic_uncompleted) + r1 <= r0 <= r1; + + if (instr_gt && arithmetic_uncompleted) + r1 <= r0s > r1s; + + if (instr_ugt && arithmetic_uncompleted) + r1 <= r0 > r1; + + if (instr_ge && arithmetic_uncompleted) + r1 <= r0s >= r1s; + + if (instr_uge && arithmetic_uncompleted) + r1 <= r0 >= r1; + if (instr_ret && arithmetic_uncompleted) begin r1 <= r0; `SET_PC(r1); |