-
Notifications
You must be signed in to change notification settings - Fork 5
/
Math.v
81 lines (64 loc) · 2.78 KB
/
Math.v
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
////////////////////////////////////////////////////////////////////////////////////////////////////
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
// 02111-1307, USA.
//
// ©2013 - Roman Ovseitsev <romovs@gmail.com>
////////////////////////////////////////////////////////////////////////////////////////////////////
//##################################################################################################
//
// Collection of helper math functions.
//
//##################################################################################################
//**************************************************************************************************
// Returns ceil(log-base-2()).
//**************************************************************************************************
function integer clog2;
input integer value;
begin
value = value-1;
for (clog2=0; value>0; clog2=clog2+1)
value = value>>1;
end
endfunction
//**************************************************************************************************
// Returns the smallest integral value greater than or equal to input value.
//**************************************************************************************************
function integer ceil;
input real value;
integer val_int;
real val_real_floor;
begin
if (value > 1.0) begin
val_int = value;
val_real_floor = val_int;
ceil = (value > val_real_floor) ? value + 1.0 : value;
end else if (value > 0.0) begin
ceil = 1;
end else begin
ceil = 0;
end
end
endfunction
//**************************************************************************************************
// Returns 1 if input value is zero. Original value returned otherwise.
// This function is used as a convenience method for compensating possible precision loss durring
// division in localparam expressions.
//**************************************************************************************************
function integer pfx;
input integer value;
begin
pfx = (value == 0 ? 1 : value);
end
endfunction