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[/] [rtf_sprite_controller/] [trunk/] [rtl/] [verilog/] [cntpop.v] - Blame information for rev 10

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// ============================================================================
//        __
//   \\__/ o\    (C) 2006-2020  Robert Finch, Waterloo
//    \  __ /    All rights reserved.
//     \/_//     robfinch<remove>@finitron.ca
//       ||
//
//      cntpop.v
//              - count number of one bits in a byte
//              - simple fast approach - lookup table
//
// BSD 3-Clause License
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its
//    contributors may be used to endorse or promote products derived from
//    this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// ============================================================================
 
module cntpop8(
        input [7:0] i,
        output reg [3:0] o
);
 
        always @(i)
                case (i)
                8'b00000000:    o = 0;
                8'b00000001:    o = 1;
                8'b00000010:    o = 1;
                8'b00000011:    o = 2;
                8'b00000100:    o = 1;
                8'b00000101:    o = 2;
                8'b00000110:    o = 2;
                8'b00000111:    o = 3;
                8'b00001000:    o = 1;
                8'b00001001:    o = 2;
                8'b00001010:    o = 2;
                8'b00001011:    o = 3;
                8'b00001100:    o = 2;
                8'b00001101:    o = 3;
                8'b00001110:    o = 3;
                8'b00001111:    o = 4;
 
                8'b00010000:    o = 1;
                8'b00010001:    o = 2;
                8'b00010010:    o = 2;
                8'b00010011:    o = 3;
                8'b00010100:    o = 2;
                8'b00010101:    o = 3;
                8'b00010110:    o = 3;
                8'b00010111:    o = 4;
                8'b00011000:    o = 2;
                8'b00011001:    o = 3;
                8'b00011010:    o = 3;
                8'b00011011:    o = 4;
                8'b00011100:    o = 3;
                8'b00011101:    o = 4;
                8'b00011110:    o = 4;
                8'b00011111:    o = 5;
 
                8'b00100000:    o = 1;
                8'b00100001:    o = 2;
                8'b00100010:    o = 2;
                8'b00100011:    o = 3;
                8'b00100100:    o = 2;
                8'b00100101:    o = 3;
                8'b00100110:    o = 3;
                8'b00100111:    o = 4;
                8'b00101000:    o = 2;
                8'b00101001:    o = 3;
                8'b00101010:    o = 3;
                8'b00101011:    o = 4;
                8'b00101100:    o = 3;
                8'b00101101:    o = 4;
                8'b00101110:    o = 4;
                8'b00101111:    o = 5;
 
                8'b00110000:    o = 2;
                8'b00110001:    o = 3;
                8'b00110010:    o = 3;
                8'b00110011:    o = 4;
                8'b00110100:    o = 3;
                8'b00110101:    o = 4;
                8'b00110110:    o = 4;
                8'b00110111:    o = 5;
                8'b00111000:    o = 3;
                8'b00111001:    o = 4;
                8'b00111010:    o = 4;
                8'b00111011:    o = 5;
                8'b00111100:    o = 4;
                8'b00111101:    o = 5;
                8'b00111110:    o = 5;
                8'b00111111:    o = 6;
 
                // 44 - 1       
                8'b01000000:    o = 1;
                8'b01000001:    o = 2;
                8'b01000010:    o = 2;
                8'b01000011:    o = 3;
                8'b01000100:    o = 2;
                8'b01000101:    o = 3;
                8'b01000110:    o = 3;
                8'b01000111:    o = 4;
                8'b01001000:    o = 2;
                8'b01001001:    o = 3;
                8'b01001010:    o = 3;
                8'b01001011:    o = 4;
                8'b01001100:    o = 3;
                8'b01001101:    o = 4;
                8'b01001110:    o = 4;
                8'b01001111:    o = 5;
 
                8'b01010000:    o = 2;
                8'b01010001:    o = 3;
                8'b01010010:    o = 3;
                8'b01010011:    o = 4;
                8'b01010100:    o = 3;
                8'b01010101:    o = 4;
                8'b01010110:    o = 4;
                8'b01010111:    o = 5;
                8'b01011000:    o = 3;
                8'b01011001:    o = 4;
                8'b01011010:    o = 4;
                8'b01011011:    o = 5;
                8'b01011100:    o = 4;
                8'b01011101:    o = 5;
                8'b01011110:    o = 5;
                8'b01011111:    o = 6;
 
                8'b01100000:    o = 2;
                8'b01100001:    o = 3;
                8'b01100010:    o = 3;
                8'b01100011:    o = 4;
                8'b01100100:    o = 3;
                8'b01100101:    o = 4;
                8'b01100110:    o = 4;
                8'b01100111:    o = 5;
                8'b01101000:    o = 3;
                8'b01101001:    o = 4;
                8'b01101010:    o = 4;
                8'b01101011:    o = 5;
                8'b01101100:    o = 4;
                8'b01101101:    o = 5;
                8'b01101110:    o = 5;
                8'b01101111:    o = 6;
 
                8'b01110000:    o = 3;
                8'b01110001:    o = 4;
                8'b01110010:    o = 4;
                8'b01110011:    o = 5;
                8'b01110100:    o = 4;
                8'b01110101:    o = 5;
                8'b01110110:    o = 5;
                8'b01110111:    o = 6;
                8'b01111000:    o = 4;
                8'b01111001:    o = 5;
                8'b01111010:    o = 5;
                8'b01111011:    o = 6;
                8'b01111100:    o = 5;
                8'b01111101:    o = 6;
                8'b01111110:    o = 6;
                8'b01111111:    o = 7;
 
                //  - 2 
                8'b10000000:    o = 1;
                8'b10000001:    o = 2;
                8'b10000010:    o = 2;
                8'b10000011:    o = 3;
                8'b10000100:    o = 2;
                8'b10000101:    o = 3;
                8'b10000110:    o = 3;
                8'b10000111:    o = 4;
                8'b10001000:    o = 2;
                8'b10001001:    o = 3;
                8'b10001010:    o = 3;
                8'b10001011:    o = 4;
                8'b10001100:    o = 3;
                8'b10001101:    o = 4;
                8'b10001110:    o = 4;
                8'b10001111:    o = 5;
 
                8'b10010000:    o = 2;
                8'b10010001:    o = 3;
                8'b10010010:    o = 3;
                8'b10010011:    o = 4;
                8'b10010100:    o = 3;
                8'b10010101:    o = 4;
                8'b10010110:    o = 4;
                8'b10010111:    o = 5;
                8'b10011000:    o = 3;
                8'b10011001:    o = 4;
                8'b10011010:    o = 4;
                8'b10011011:    o = 5;
                8'b10011100:    o = 4;
                8'b10011101:    o = 5;
                8'b10011110:    o = 5;
                8'b10011111:    o = 6;
 
                8'b10100000:    o = 2;
                8'b10100001:    o = 3;
                8'b10100010:    o = 3;
                8'b10100011:    o = 4;
                8'b10100100:    o = 3;
                8'b10100101:    o = 4;
                8'b10100110:    o = 4;
                8'b10100111:    o = 5;
                8'b10101000:    o = 3;
                8'b10101001:    o = 4;
                8'b10101010:    o = 4;
                8'b10101011:    o = 5;
                8'b10101100:    o = 4;
                8'b10101101:    o = 5;
                8'b10101110:    o = 5;
                8'b10101111:    o = 6;
 
                8'b10110000:    o = 3;
                8'b10110001:    o = 4;
                8'b10110010:    o = 4;
                8'b10110011:    o = 5;
                8'b10110100:    o = 4;
                8'b10110101:    o = 5;
                8'b10110110:    o = 5;
                8'b10110111:    o = 6;
                8'b10111000:    o = 4;
                8'b10111001:    o = 5;
                8'b10111010:    o = 5;
                8'b10111011:    o = 6;
                8'b10111100:    o = 5;
                8'b10111101:    o = 6;
                8'b10111110:    o = 6;
                8'b10111111:    o = 7;
 
                // 44 - 3       
                8'b11000000:    o = 2;
                8'b11000001:    o = 3;
                8'b11000010:    o = 3;
                8'b11000011:    o = 4;
                8'b11000100:    o = 3;
                8'b11000101:    o = 4;
                8'b11000110:    o = 4;
                8'b11000111:    o = 5;
                8'b11001000:    o = 3;
                8'b11001001:    o = 4;
                8'b11001010:    o = 4;
                8'b11001011:    o = 5;
                8'b11001100:    o = 4;
                8'b11001101:    o = 5;
                8'b11001110:    o = 5;
                8'b11001111:    o = 6;
 
                8'b11010000:    o = 3;
                8'b11010001:    o = 4;
                8'b11010010:    o = 4;
                8'b11010011:    o = 5;
                8'b11010100:    o = 4;
                8'b11010101:    o = 5;
                8'b11010110:    o = 5;
                8'b11010111:    o = 6;
                8'b11011000:    o = 4;
                8'b11011001:    o = 5;
                8'b11011010:    o = 5;
                8'b11011011:    o = 6;
                8'b11011100:    o = 5;
                8'b11011101:    o = 6;
                8'b11011110:    o = 6;
                8'b11011111:    o = 7;
 
                8'b11100000:    o = 3;
                8'b11100001:    o = 4;
                8'b11100010:    o = 4;
                8'b11100011:    o = 5;
                8'b11100100:    o = 4;
                8'b11100101:    o = 5;
                8'b11100110:    o = 5;
                8'b11100111:    o = 6;
                8'b11101000:    o = 4;
                8'b11101001:    o = 5;
                8'b11101010:    o = 5;
                8'b11101011:    o = 6;
                8'b11101100:    o = 5;
                8'b11101101:    o = 6;
                8'b11101110:    o = 6;
                8'b11101111:    o = 7;
 
                8'b11110000:    o = 4;
                8'b11110001:    o = 5;
                8'b11110010:    o = 5;
                8'b11110011:    o = 6;
                8'b11110100:    o = 5;
                8'b11110101:    o = 6;
                8'b11110110:    o = 6;
                8'b11110111:    o = 7;
                8'b11111000:    o = 5;
                8'b11111001:    o = 6;
                8'b11111010:    o = 6;
                8'b11111011:    o = 7;
                8'b11111100:    o = 6;
                8'b11111101:    o = 7;
                8'b11111110:    o = 7;
                8'b11111111:    o = 8;
 
                endcase
 
 
endmodule
 
 
module cntpop16(
        input [15:0] i,
        output [4:0] o
);
 
        wire [3:0] cnt1, cnt2;
 
        cntpop8 u1 (i[ 7:0],cnt1);
        cntpop8 u2 (i[15:8],cnt2);
 
        assign o = cnt1 + cnt2;
 
endmodule
 
 
// 76 slices / 147 LUTs / 19 ns
module cntpop32(
        input [31:0] i,
        output [5:0] o
);
 
        wire [3:0] cnt1, cnt2, cnt3, cnt4;
 
        // cntpop8 results in faster result than cntpop16
        cntpop8 u1 (i[ 7: 0],cnt1);
        cntpop8 u2 (i[15: 8],cnt2);
        cntpop8 u3 (i[23:16],cnt3);
        cntpop8 u4 (i[31:24],cnt4);
 
        assign o = cnt1+cnt2+cnt3+cnt4;
 
endmodule
 
 
// 156 slices / 300 LUTs / 22.2 ns
module cntpop64(
        input [63:0] i,
        output [6:0] o
);
 
        wire [4:0] cnt1, cnt2, cnt3, cnt4;
 
        cntpop16 u1 (i[15: 0],cnt1);
        cntpop16 u2 (i[31:16],cnt2);
        cntpop16 u3 (i[47:32],cnt3);
        cntpop16 u4 (i[63:48],cnt4);
 
        assign o = cnt1+cnt2+cnt3+cnt4;
 
endmodule
 
module cntpop80(
        input [79:0] i,
        output [6:0] o
);
 
        wire [4:0] cnt1, cnt2, cnt3, cnt4, cnt5;
 
        cntpop16 u1 (i[15: 0],cnt1);
        cntpop16 u2 (i[31:16],cnt2);
        cntpop16 u3 (i[47:32],cnt3);
        cntpop16 u4 (i[63:48],cnt4);
        cntpop16 u5 (i[79:64],cnt5);
 
        assign o = cnt1+cnt2+cnt3+cnt4+cnt5;
 
endmodule
 
module cntpop128(
        input [127:0] i,
        output [7:0] o
);
 
        wire [6:0] cnt1, cnt2;
 
        cntpop64 u1 (i[63: 0],cnt1);
        cntpop64 u2 (i[127:64],cnt2);
 
        assign o = cnt1+cnt2;
 
endmodule
 
 
module cntpop16reg (
  input clk,
  input ce,
        input [15:0] i,
        output reg [4:0] o
);
 
        wire [3:0] cnt1, cnt2;
 
        cntpop8 u1 (i[ 7:0],cnt1);
        cntpop8 u2 (i[15:8],cnt2);
 
  always @(posedge clk)
          if (ce) o <= cnt1 + cnt2;
 
endmodule
 
module cntpop64reg(
  input clk,
  input ce,
        input [63:0] i,
        output reg [6:0] o
);
 
        wire [4:0] cnt1, cnt2, cnt3, cnt4;
 
        cntpop16reg u1 (clk, ce, i[15: 0],cnt1);
        cntpop16reg u2 (clk, ce, i[31:16],cnt2);
        cntpop16reg u3 (clk, ce, i[47:32],cnt3);
        cntpop16reg u4 (clk, ce, i[63:48],cnt4);
 
  always @(posedge clk)
          if (ce) o <= cnt1+cnt2+cnt3+cnt4;
 
endmodule

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[/] [rtf_sprite_controller/] [trunk/] [rtl/] [verilog/] [cntpop.v] - Blame information for rev 10

Line No.	Rev	Author	Line
1	9	robfinch	`// ============================================================================`
2			`// __`
3			`// \\__/ o\ (C) 2006-2020 Robert Finch, Waterloo`
4			`// \ __ / All rights reserved.`
5			`// \/_// robfinch<remove>@finitron.ca`
6			`// \|\|`
7			`//`
8			`// cntpop.v`
9			`// - count number of one bits in a byte`
10			`// - simple fast approach - lookup table`
11			`//`
12			`// BSD 3-Clause License`
13			`// Redistribution and use in source and binary forms, with or without`
14			`// modification, are permitted provided that the following conditions are met:`
15			`//`
16			`// 1. Redistributions of source code must retain the above copyright notice, this`
17			`// list of conditions and the following disclaimer.`
18			`//`
19			`// 2. Redistributions in binary form must reproduce the above copyright notice,`
20			`// this list of conditions and the following disclaimer in the documentation`
21			`// and/or other materials provided with the distribution.`
22			`//`
23			`// 3. Neither the name of the copyright holder nor the names of its`
24			`// contributors may be used to endorse or promote products derived from`
25			`// this software without specific prior written permission.`
26			`//`
27			`// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"`
28			`// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE`
29			`// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE`
30			`// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE`
31			`// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL`
32			`// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR`
33			`// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER`
34			`// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,`
35			`// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE`
36			`// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.`
37			`//`
38			`// ============================================================================`
39
40			`module cntpop8(`
41			`input [7:0] i,`
42			`output reg [3:0] o`
43			`);`
44
45			`always @(i)`
46			`case (i)`
47			`8'b00000000: o = 0;`
48			`8'b00000001: o = 1;`
49			`8'b00000010: o = 1;`
50			`8'b00000011: o = 2;`
51			`8'b00000100: o = 1;`
52			`8'b00000101: o = 2;`
53			`8'b00000110: o = 2;`
54			`8'b00000111: o = 3;`
55			`8'b00001000: o = 1;`
56			`8'b00001001: o = 2;`
57			`8'b00001010: o = 2;`
58			`8'b00001011: o = 3;`
59			`8'b00001100: o = 2;`
60			`8'b00001101: o = 3;`
61			`8'b00001110: o = 3;`
62			`8'b00001111: o = 4;`
63
64			`8'b00010000: o = 1;`
65			`8'b00010001: o = 2;`
66			`8'b00010010: o = 2;`
67			`8'b00010011: o = 3;`
68			`8'b00010100: o = 2;`
69			`8'b00010101: o = 3;`
70			`8'b00010110: o = 3;`
71			`8'b00010111: o = 4;`
72			`8'b00011000: o = 2;`
73			`8'b00011001: o = 3;`
74			`8'b00011010: o = 3;`
75			`8'b00011011: o = 4;`
76			`8'b00011100: o = 3;`
77			`8'b00011101: o = 4;`
78			`8'b00011110: o = 4;`
79			`8'b00011111: o = 5;`
80
81			`8'b00100000: o = 1;`
82			`8'b00100001: o = 2;`
83			`8'b00100010: o = 2;`
84			`8'b00100011: o = 3;`
85			`8'b00100100: o = 2;`
86			`8'b00100101: o = 3;`
87			`8'b00100110: o = 3;`
88			`8'b00100111: o = 4;`
89			`8'b00101000: o = 2;`
90			`8'b00101001: o = 3;`
91			`8'b00101010: o = 3;`
92			`8'b00101011: o = 4;`
93			`8'b00101100: o = 3;`
94			`8'b00101101: o = 4;`
95			`8'b00101110: o = 4;`
96			`8'b00101111: o = 5;`
97
98			`8'b00110000: o = 2;`
99			`8'b00110001: o = 3;`
100			`8'b00110010: o = 3;`
101			`8'b00110011: o = 4;`
102			`8'b00110100: o = 3;`
103			`8'b00110101: o = 4;`
104			`8'b00110110: o = 4;`
105			`8'b00110111: o = 5;`
106			`8'b00111000: o = 3;`
107			`8'b00111001: o = 4;`
108			`8'b00111010: o = 4;`
109			`8'b00111011: o = 5;`
110			`8'b00111100: o = 4;`
111			`8'b00111101: o = 5;`
112			`8'b00111110: o = 5;`
113			`8'b00111111: o = 6;`
114
115			`// 44 - 1`
116			`8'b01000000: o = 1;`
117			`8'b01000001: o = 2;`
118			`8'b01000010: o = 2;`
119			`8'b01000011: o = 3;`
120			`8'b01000100: o = 2;`
121			`8'b01000101: o = 3;`
122			`8'b01000110: o = 3;`
123			`8'b01000111: o = 4;`
124			`8'b01001000: o = 2;`
125			`8'b01001001: o = 3;`
126			`8'b01001010: o = 3;`
127			`8'b01001011: o = 4;`
128			`8'b01001100: o = 3;`
129			`8'b01001101: o = 4;`
130			`8'b01001110: o = 4;`
131			`8'b01001111: o = 5;`
132
133			`8'b01010000: o = 2;`
134			`8'b01010001: o = 3;`
135			`8'b01010010: o = 3;`
136			`8'b01010011: o = 4;`
137			`8'b01010100: o = 3;`
138			`8'b01010101: o = 4;`
139			`8'b01010110: o = 4;`
140			`8'b01010111: o = 5;`
141			`8'b01011000: o = 3;`
142			`8'b01011001: o = 4;`
143			`8'b01011010: o = 4;`
144			`8'b01011011: o = 5;`
145			`8'b01011100: o = 4;`
146			`8'b01011101: o = 5;`
147			`8'b01011110: o = 5;`
148			`8'b01011111: o = 6;`
149
150			`8'b01100000: o = 2;`
151			`8'b01100001: o = 3;`
152			`8'b01100010: o = 3;`
153			`8'b01100011: o = 4;`
154			`8'b01100100: o = 3;`
155			`8'b01100101: o = 4;`
156			`8'b01100110: o = 4;`
157			`8'b01100111: o = 5;`
158			`8'b01101000: o = 3;`
159			`8'b01101001: o = 4;`
160			`8'b01101010: o = 4;`
161			`8'b01101011: o = 5;`
162			`8'b01101100: o = 4;`
163			`8'b01101101: o = 5;`
164			`8'b01101110: o = 5;`
165			`8'b01101111: o = 6;`
166
167			`8'b01110000: o = 3;`
168			`8'b01110001: o = 4;`
169			`8'b01110010: o = 4;`
170			`8'b01110011: o = 5;`
171			`8'b01110100: o = 4;`
172			`8'b01110101: o = 5;`
173			`8'b01110110: o = 5;`
174			`8'b01110111: o = 6;`
175			`8'b01111000: o = 4;`
176			`8'b01111001: o = 5;`
177			`8'b01111010: o = 5;`
178			`8'b01111011: o = 6;`
179			`8'b01111100: o = 5;`
180			`8'b01111101: o = 6;`
181			`8'b01111110: o = 6;`
182			`8'b01111111: o = 7;`
183
184			`// - 2`
185			`8'b10000000: o = 1;`
186			`8'b10000001: o = 2;`
187			`8'b10000010: o = 2;`
188			`8'b10000011: o = 3;`
189			`8'b10000100: o = 2;`
190			`8'b10000101: o = 3;`
191			`8'b10000110: o = 3;`
192			`8'b10000111: o = 4;`
193			`8'b10001000: o = 2;`
194			`8'b10001001: o = 3;`
195			`8'b10001010: o = 3;`
196			`8'b10001011: o = 4;`
197			`8'b10001100: o = 3;`
198			`8'b10001101: o = 4;`
199			`8'b10001110: o = 4;`
200			`8'b10001111: o = 5;`
201
202			`8'b10010000: o = 2;`
203			`8'b10010001: o = 3;`
204			`8'b10010010: o = 3;`
205			`8'b10010011: o = 4;`
206			`8'b10010100: o = 3;`
207			`8'b10010101: o = 4;`
208			`8'b10010110: o = 4;`
209			`8'b10010111: o = 5;`
210			`8'b10011000: o = 3;`
211			`8'b10011001: o = 4;`
212			`8'b10011010: o = 4;`
213			`8'b10011011: o = 5;`
214			`8'b10011100: o = 4;`
215			`8'b10011101: o = 5;`
216			`8'b10011110: o = 5;`
217			`8'b10011111: o = 6;`
218
219			`8'b10100000: o = 2;`
220			`8'b10100001: o = 3;`
221			`8'b10100010: o = 3;`
222			`8'b10100011: o = 4;`
223			`8'b10100100: o = 3;`
224			`8'b10100101: o = 4;`
225			`8'b10100110: o = 4;`
226			`8'b10100111: o = 5;`
227			`8'b10101000: o = 3;`
228			`8'b10101001: o = 4;`
229			`8'b10101010: o = 4;`
230			`8'b10101011: o = 5;`
231			`8'b10101100: o = 4;`
232			`8'b10101101: o = 5;`
233			`8'b10101110: o = 5;`
234			`8'b10101111: o = 6;`
235
236			`8'b10110000: o = 3;`
237			`8'b10110001: o = 4;`
238			`8'b10110010: o = 4;`
239			`8'b10110011: o = 5;`
240			`8'b10110100: o = 4;`
241			`8'b10110101: o = 5;`
242			`8'b10110110: o = 5;`
243			`8'b10110111: o = 6;`
244			`8'b10111000: o = 4;`
245			`8'b10111001: o = 5;`
246			`8'b10111010: o = 5;`
247			`8'b10111011: o = 6;`
248			`8'b10111100: o = 5;`
249			`8'b10111101: o = 6;`
250			`8'b10111110: o = 6;`
251			`8'b10111111: o = 7;`
252
253			`// 44 - 3`
254			`8'b11000000: o = 2;`
255			`8'b11000001: o = 3;`
256			`8'b11000010: o = 3;`
257			`8'b11000011: o = 4;`
258			`8'b11000100: o = 3;`
259			`8'b11000101: o = 4;`
260			`8'b11000110: o = 4;`
261			`8'b11000111: o = 5;`
262			`8'b11001000: o = 3;`
263			`8'b11001001: o = 4;`
264			`8'b11001010: o = 4;`
265			`8'b11001011: o = 5;`
266			`8'b11001100: o = 4;`
267			`8'b11001101: o = 5;`
268			`8'b11001110: o = 5;`
269			`8'b11001111: o = 6;`
270
271			`8'b11010000: o = 3;`
272			`8'b11010001: o = 4;`
273			`8'b11010010: o = 4;`
274			`8'b11010011: o = 5;`
275			`8'b11010100: o = 4;`
276			`8'b11010101: o = 5;`
277			`8'b11010110: o = 5;`
278			`8'b11010111: o = 6;`
279			`8'b11011000: o = 4;`
280			`8'b11011001: o = 5;`
281			`8'b11011010: o = 5;`
282			`8'b11011011: o = 6;`
283			`8'b11011100: o = 5;`
284			`8'b11011101: o = 6;`
285			`8'b11011110: o = 6;`
286			`8'b11011111: o = 7;`
287
288			`8'b11100000: o = 3;`
289			`8'b11100001: o = 4;`
290			`8'b11100010: o = 4;`
291			`8'b11100011: o = 5;`
292			`8'b11100100: o = 4;`
293			`8'b11100101: o = 5;`
294			`8'b11100110: o = 5;`
295			`8'b11100111: o = 6;`
296			`8'b11101000: o = 4;`
297			`8'b11101001: o = 5;`
298			`8'b11101010: o = 5;`
299			`8'b11101011: o = 6;`
300			`8'b11101100: o = 5;`
301			`8'b11101101: o = 6;`
302			`8'b11101110: o = 6;`
303			`8'b11101111: o = 7;`
304
305			`8'b11110000: o = 4;`
306			`8'b11110001: o = 5;`
307			`8'b11110010: o = 5;`
308			`8'b11110011: o = 6;`
309			`8'b11110100: o = 5;`
310			`8'b11110101: o = 6;`
311			`8'b11110110: o = 6;`
312			`8'b11110111: o = 7;`
313			`8'b11111000: o = 5;`
314			`8'b11111001: o = 6;`
315			`8'b11111010: o = 6;`
316			`8'b11111011: o = 7;`
317			`8'b11111100: o = 6;`
318			`8'b11111101: o = 7;`
319			`8'b11111110: o = 7;`
320			`8'b11111111: o = 8;`
321
322			`endcase`
323
324
325			`endmodule`
326
327
328			`module cntpop16(`
329			`input [15:0] i,`
330			`output [4:0] o`
331			`);`
332
333			`wire [3:0] cnt1, cnt2;`
334
335			`cntpop8 u1 (i[ 7:0],cnt1);`
336			`cntpop8 u2 (i[15:8],cnt2);`
337
338			`assign o = cnt1 + cnt2;`
339
340			`endmodule`
341
342
343			`// 76 slices / 147 LUTs / 19 ns`
344			`module cntpop32(`
345			`input [31:0] i,`
346			`output [5:0] o`
347			`);`
348
349			`wire [3:0] cnt1, cnt2, cnt3, cnt4;`
350
351			`// cntpop8 results in faster result than cntpop16`
352			`cntpop8 u1 (i[ 7: 0],cnt1);`
353			`cntpop8 u2 (i[15: 8],cnt2);`
354			`cntpop8 u3 (i[23:16],cnt3);`
355			`cntpop8 u4 (i[31:24],cnt4);`
356
357			`assign o = cnt1+cnt2+cnt3+cnt4;`
358
359			`endmodule`
360
361
362			`// 156 slices / 300 LUTs / 22.2 ns`
363			`module cntpop64(`
364			`input [63:0] i,`
365			`output [6:0] o`
366			`);`
367
368			`wire [4:0] cnt1, cnt2, cnt3, cnt4;`
369
370			`cntpop16 u1 (i[15: 0],cnt1);`
371			`cntpop16 u2 (i[31:16],cnt2);`
372			`cntpop16 u3 (i[47:32],cnt3);`
373			`cntpop16 u4 (i[63:48],cnt4);`
374
375			`assign o = cnt1+cnt2+cnt3+cnt4;`
376
377			`endmodule`
378
379			`module cntpop80(`
380			`input [79:0] i,`
381			`output [6:0] o`
382			`);`
383
384			`wire [4:0] cnt1, cnt2, cnt3, cnt4, cnt5;`
385
386			`cntpop16 u1 (i[15: 0],cnt1);`
387			`cntpop16 u2 (i[31:16],cnt2);`
388			`cntpop16 u3 (i[47:32],cnt3);`
389			`cntpop16 u4 (i[63:48],cnt4);`
390			`cntpop16 u5 (i[79:64],cnt5);`
391
392			`assign o = cnt1+cnt2+cnt3+cnt4+cnt5;`
393
394			`endmodule`
395
396			`module cntpop128(`
397			`input [127:0] i,`
398			`output [7:0] o`
399			`);`
400
401			`wire [6:0] cnt1, cnt2;`
402
403			`cntpop64 u1 (i[63: 0],cnt1);`
404			`cntpop64 u2 (i[127:64],cnt2);`
405
406			`assign o = cnt1+cnt2;`
407
408			`endmodule`
409
410
411			`module cntpop16reg (`
412			`input clk,`
413			`input ce,`
414			`input [15:0] i,`
415			`output reg [4:0] o`
416			`);`
417
418			`wire [3:0] cnt1, cnt2;`
419
420			`cntpop8 u1 (i[ 7:0],cnt1);`
421			`cntpop8 u2 (i[15:8],cnt2);`
422
423			`always @(posedge clk)`
424			`if (ce) o <= cnt1 + cnt2;`
425
426			`endmodule`
427
428			`module cntpop64reg(`
429			`input clk,`
430			`input ce,`
431			`input [63:0] i,`
432			`output reg [6:0] o`
433			`);`
434
435			`wire [4:0] cnt1, cnt2, cnt3, cnt4;`
436
437			`cntpop16reg u1 (clk, ce, i[15: 0],cnt1);`
438			`cntpop16reg u2 (clk, ce, i[31:16],cnt2);`
439			`cntpop16reg u3 (clk, ce, i[47:32],cnt3);`
440			`cntpop16reg u4 (clk, ce, i[63:48],cnt4);`
441
442			`always @(posedge clk)`
443			`if (ce) o <= cnt1+cnt2+cnt3+cnt4;`
444
445			`endmodule`