This repository has been archived by the owner on Sep 11, 2023. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 3
/
Lzd.sv
132 lines (125 loc) · 6.61 KB
/
Lzd.sv
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
/*
* Copyright (C) 2022 Intel Corporation
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License, as published
* by the Free Software Foundation; either version 3 of the License,
* or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*
*
* SPDX-License-Identifier: LGPL-3.0-or-later
*/
`include "globals.svh"
module Lzd #(
parameter WIDTH
)
(
input logic [WIDTH-1:0] in,
output logic [$clog2(WIDTH)-1:0] lz
);
localparam bias = -1;
generate
if(WIDTH == 53) begin // double precision
always_comb begin
casez (in)
53'b1????????????????????????????????????????????????????: lz = 1 + bias;
53'b01???????????????????????????????????????????????????: lz = 2 + bias;
53'b001??????????????????????????????????????????????????: lz = 3 + bias;
53'b0001?????????????????????????????????????????????????: lz = 4 + bias;
53'b00001????????????????????????????????????????????????: lz = 5 + bias;
53'b000001???????????????????????????????????????????????: lz = 6 + bias;
53'b0000001??????????????????????????????????????????????: lz = 7 + bias;
53'b00000001?????????????????????????????????????????????: lz = 8 + bias;
53'b000000001????????????????????????????????????????????: lz = 9 + bias;
53'b0000000001???????????????????????????????????????????: lz = 10 + bias;
53'b00000000001??????????????????????????????????????????: lz = 11 + bias;
53'b000000000001?????????????????????????????????????????: lz = 12 + bias;
53'b0000000000001????????????????????????????????????????: lz = 13 + bias;
53'b00000000000001???????????????????????????????????????: lz = 14 + bias;
53'b000000000000001??????????????????????????????????????: lz = 15 + bias;
53'b0000000000000001?????????????????????????????????????: lz = 16 + bias;
53'b00000000000000001????????????????????????????????????: lz = 17 + bias;
53'b000000000000000001???????????????????????????????????: lz = 18 + bias;
53'b0000000000000000001??????????????????????????????????: lz = 19 + bias;
53'b00000000000000000001?????????????????????????????????: lz = 20 + bias;
53'b000000000000000000001????????????????????????????????: lz = 21 + bias;
53'b0000000000000000000001???????????????????????????????: lz = 22 + bias;
53'b00000000000000000000001??????????????????????????????: lz = 23 + bias;
53'b000000000000000000000001?????????????????????????????: lz = 24 + bias;
53'b0000000000000000000000001????????????????????????????: lz = 25 + bias;
53'b00000000000000000000000001???????????????????????????: lz = 26 + bias;
53'b000000000000000000000000001??????????????????????????: lz = 27 + bias;
53'b0000000000000000000000000001?????????????????????????: lz = 28 + bias;
53'b00000000000000000000000000001????????????????????????: lz = 29 + bias;
53'b000000000000000000000000000001???????????????????????: lz = 30 + bias;
53'b0000000000000000000000000000001??????????????????????: lz = 31 + bias;
53'b00000000000000000000000000000001?????????????????????: lz = 32 + bias;
53'b000000000000000000000000000000001????????????????????: lz = 33 + bias;
53'b0000000000000000000000000000000001???????????????????: lz = 34 + bias;
53'b00000000000000000000000000000000001??????????????????: lz = 35 + bias;
53'b000000000000000000000000000000000001?????????????????: lz = 36 + bias;
53'b0000000000000000000000000000000000001????????????????: lz = 37 + bias;
53'b00000000000000000000000000000000000001???????????????: lz = 38 + bias;
53'b000000000000000000000000000000000000001??????????????: lz = 39 + bias;
53'b0000000000000000000000000000000000000001?????????????: lz = 40 + bias;
53'b00000000000000000000000000000000000000001????????????: lz = 41 + bias;
53'b000000000000000000000000000000000000000001???????????: lz = 42 + bias;
53'b0000000000000000000000000000000000000000001??????????: lz = 43 + bias;
53'b00000000000000000000000000000000000000000001?????????: lz = 44 + bias;
53'b000000000000000000000000000000000000000000001????????: lz = 45 + bias;
53'b0000000000000000000000000000000000000000000001???????: lz = 46 + bias;
53'b00000000000000000000000000000000000000000000001??????: lz = 47 + bias;
53'b000000000000000000000000000000000000000000000001?????: lz = 48 + bias;
53'b0000000000000000000000000000000000000000000000001????: lz = 49 + bias;
53'b00000000000000000000000000000000000000000000000001???: lz = 50 + bias;
53'b000000000000000000000000000000000000000000000000001??: lz = 51 + bias;
53'b0000000000000000000000000000000000000000000000000001?: lz = 52 + bias;
53'b00000000000000000000000000000000000000000000000000001: lz = 53 + bias;
53'b00000000000000000000000000000000000000000000000000000: lz = 54 + bias;
default : lz = 'x;
endcase
end
end
else if(WIDTH == 24) begin // hfloat + bfloat
always_comb begin
casez (in)
24'b1???????????????????????: lz = 0;
24'b01??????????????????????: lz = 1;
24'b001?????????????????????: lz = 2;
24'b0001????????????????????: lz = 3;
24'b00001???????????????????: lz = 4;
24'b000001??????????????????: lz = 5;
24'b0000001?????????????????: lz = 6;
24'b00000001????????????????: lz = 7;
24'b000000001???????????????: lz = 8;
24'b0000000001??????????????: lz = 9;
24'b00000000001?????????????: lz = 10;
24'b000000000001????????????: lz = 11;
24'b0000000000001???????????: lz = 12;
24'b00000000000001??????????: lz = 13;
24'b000000000000001?????????: lz = 14;
24'b0000000000000001????????: lz = 15;
24'b00000000000000001???????: lz = 16;
24'b000000000000000001??????: lz = 17;
24'b0000000000000000001?????: lz = 18;
24'b00000000000000000001????: lz = 19;
24'b000000000000000000001???: lz = 20;
24'b0000000000000000000001??: lz = 21;
24'b00000000000000000000001?: lz = 22;
24'b000000000000000000000001: lz = 23;
24'b000000000000000000000000: lz = 24;
default : lz = 'x;
endcase
end
end
else always_comb $error("Unexpected input WIDTH %d", WIDTH);
endgenerate
endmodule