Merge branch 'master' of https://github.gatech.edu/casl/Vortex

hw/rtl/libs/VX_popcount.v

@@ -0,0 +1,58 @@
+`include "VX_platform.vh"
+
+`TRACING_OFF
+module VX_popcount #(
+    parameter MODEL = 1,
+    parameter N     = 1,
+    parameter LOGN  = $clog2(N),
+    parameter M     = LOGN+1    
+) (
+    input  wire [N-1:0] in_i,
+    output wire [M-1:0] cnt_o
+);
+    if (N == 1) begin
+
+        assign cnt_o = in_i;
+
+    end else if (MODEL == 1) begin
+    `IGNORE_WARNINGS_BEGIN
+        localparam PN    = 1 << $clog2(N);
+        localparam LOGPN = $clog2(PN);
+        
+        wire [M-1:0] tmp [0:PN-1] [0:PN-1];
+        
+        for (genvar i = 0; i < N; ++i) begin        
+            assign tmp[0][i] = in_i[i];
+        end
+
+        for (genvar i = N; i < PN; ++i) begin        
+            assign tmp[0][i] = '0;
+        end
+
+        for (genvar j = 0; j < LOGPN; ++j) begin
+            for (genvar i = 0; i < (1 << (LOGPN-j-1)); ++i) begin
+                assign tmp[j+1][i] = tmp[j][i*2] + tmp[j][i*2+1];
+            end
+        end
+
+        assign cnt_o = tmp[LOGPN][0];
+    `IGNORE_WARNINGS_END
+    end else begin
+
+        reg [M-1:0] cnt_r;
+
+        always @(*) begin
+            cnt_r = '0;
+            for (integer i = 0; i < N; ++i) begin
+            `IGNORE_WARNINGS_BEGIN
+                cnt_r = cnt_r + in_i[i];
+            `IGNORE_WARNINGS_END
+            end
+        end
+
+        assign cnt_o = cnt_r;
+    
+    end
+
+endmodule
+`TRACING_ON