Updated shifter testbench to work with 2^n widths rather than bitwidths.

tests/shifter_tb.sv

@@ -1,62 +1,62 @@
 `include "shifter.sv"
-module shifter_tb #(width=8)();
+module shifter_tb #(width=4)();
     logic [2:0] op;
-    logic [width-1:0] Y;
+    logic [2**width-1:0] Y;
-    logic [width-1:0] A_in;
+    logic [2**width-1:0] A_in;
-    logic [$clog2(width)-1:0] B_in;
+    logic [2**width-1:0] B_in;
     logic [width-1:0] C_in;
 
     logic [2:0] ops[6];
-    logic [width-1:0] A[6];
+    logic [2**width-1:0] A[6];
-    logic [$clog2(width)-1:0] B[6];
+    logic [2**width-1:0] B[6];
     logic [width-1:0] C[6];
-    logic [width-1:0] Y_exp[6];
+    logic [2**width-1:0] Y_exp[6];
 
-    shifter #(width) dut(op, A_in,C_in,B_in,Y);
+    shifter #(width) dut(op, A_in,B_in,C_in,Y);
 
     integer error_count;
     initial begin
         // Test left shift by C
         ops[0] = 3'b000;
-        A[0] = {{(width-1){1'b0}}, {1'b1}};
+        A[0] = {{(2**width-1){1'b0}}, {1'b1}};
         C[0] = {{(width-1){1'b0}}, {1'b1}};
-        B[0] = {width{1'b0}};
+        B[0] = {2**width{1'b0}};
-        Y_exp[0] = {{(width-2){1'b0}}, {2'b10}};
+        Y_exp[0] = {{(2**width-2){1'b0}}, {2'b10}};
 
         // Test left shift by B
         ops[1] = 3'b100;
-        A[1] = {{(width-1){1'b0}}, {1'b1}};
+        A[1] = {{(2**width-1){1'b0}}, {1'b1}};
         C[1] = {{(width-1){1'b0}}, {1'b1}};
-        B[1] = {{($clog2(width)-2){1'b0}}, 2'b10};
+        B[1] = {{(2**width-2){1'b0}}, 2'b10};
-        Y_exp[1] = {{(width-3){1'b0}}, {3'b100}};
+        Y_exp[1] = {{(2**width-3){1'b0}}, {3'b100}};
 
         // Test Logical right shift by C
         ops[2] = 3'b001;
-        A[2] = {{(width-2){1'b0}}, {2'b10}};
+        A[2] = {{(2**width-2){1'b0}}, {2'b10}};
         C[2] = {{(width-1){1'b0}}, {1'b1}};
-        B[2] = {width{1'b0}};
+        B[2] = {2**width{1'b0}};
-        Y_exp[2] = {{(width-1){1'b0}}, {1'b1}};
+        Y_exp[2] = {{(2**width-1){1'b0}}, {1'b1}};
 
         // Test Logical right shift by B
         ops[3] = 3'b101;
-        A[3] = {{(width-1){1'b0}}, {2'b10}};
+        A[3] = {{(2**width-1){1'b0}}, {2'b10}};
         C[3] = {{(width-1){1'b0}}, {1'b1}};
-        B[3] = {{($clog2(width)-2){1'b0}}, 2'b10};
+        B[3] = {{(2**width-2){1'b0}}, 2'b10};
-        Y_exp[3] = {{(width-1){1'b0}}, {1'b0}};
+        Y_exp[3] = {{(2**width-1){1'b0}}, {1'b0}};
 
         // Test arithmetic shift right by C
         ops[4] = 3'b011;
-        A[4] = {{(width-1){1'b1}}, 1'b0};   // -2
+        A[4] = {{(2**width-1){1'b1}}, 1'b0};   // -2
         C[4] = {{(width-1){1'b0}}, 1'b1};   // 1
-        B[4] = {{(width-2){1'b0}}, 2'b10};  // 2
+        B[4] = {{(2**width-2){1'b0}}, 2'b10};  // 2
-        Y_exp[4] = {width{1'b1}};           // -1
+        Y_exp[4] = {2**width{1'b1}};           // -1
 
         // Test arithmetic shift right by B
         ops[5] = 3'b111;
-        A[5] = {{(width-2){1'b1}}, 2'b00};   // -4
+        A[5] = {{(2**width-2){1'b1}}, 2'b00};   // -4
         C[5] = {{(width-1){1'b0}}, 1'b1};   // 1
-        B[5] = {{(width-2){1'b0}}, 2'b10};  // 2
+        B[5] = {{(2**width-2){1'b0}}, 2'b10};  // 2
-        Y_exp[5] = {width{1'b1}};           // -1
+        Y_exp[5] = {2**width{1'b1}};           // -1
 
         error_count = 0;
         $display("Beginning Shifter tests");