Add macc test, with equiv_opt not currently passing

tests/xilinx/macc.v

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+// Signed 40-bit streaming accumulator with 16-bit inputs
+// File: HDL_Coding_Techniques/multipliers/multipliers4.v
+//
+module macc # (parameter SIZEIN = /*16*/7, SIZEOUT = 40)
+ (input clk, ce, sload,
+ input signed [SIZEIN-1:0] a, b,
+ output signed [SIZEOUT-1:0] accum_out);
+ // Declare registers for intermediate values
+ reg signed [SIZEIN-1:0] a_reg, b_reg;
+ reg sload_reg;
+ reg signed [2*SIZEIN:0] mult_reg;
+ reg signed [SIZEOUT-1:0] adder_out, old_result;
+ always @(adder_out or sload_reg) begin
+ //if (sload_reg)
+ //old_result <= 0;
+ //else
+ // 'sload' is now active (=low) and opens the accumulation loop.
+ // The accumulator takes the next multiplier output in
+ // the same cycle.
+ old_result <= adder_out;
+ a_reg <= a;
+ b_reg <= b;
+ end
+
+ always @(posedge clk)
+ //if (ce)
+ begin
+ mult_reg <= a_reg * b_reg;
+ sload_reg <= sload;
+ // Store accumulation result into a register
+ adder_out <= old_result + mult_reg;
+ end
+
+ // Output accumulation result
+ assign accum_out = adder_out;
+
+endmodule // macc

tests/xilinx/macc.ys

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+read_verilog macc.v
+proc
+hierarchy -top macc
+equiv_opt -run :restore -map +/xilinx/cells_sim.v synth_xilinx # equivalency check
+
+#equiv_miter -trigger miter equiv
+#sat -verify -prove-asserts -tempinduct -show-inputs -show-outputs miter
+
+#equiv_opt -assert -run :prove -map +/xilinx/cells_sim.v synth_xilinx # equivalency check
+#miter -equiv -flatten -make_assert -make_outputs gold gate miter
+#sat -set-init-zero -verify -prove-asserts -seq 10 -show-inputs -show-outputs miter
+
+design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
+cd macc # Constrain all select calls below inside the top module
+select -assert-count 1 t:BUFG
+select -assert-count 1 t:DSP48E1
+select -assert-none t:BUFG t:DSP48E1 %% t:* %D