blob: 10f27cfebe43b05c00d4dc2ce956f7f12eb50f37 (
plain)
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
|
/* Copyright (c) 1997-2001 Miller Puckette and others.
* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution. */
/* mathematical functions and other transfer functions, including tilde
versions of stuff from x_acoustics.c.
*/
#include "d_math.h"
/* these are used in externs like "bonk" */
t_float q8_rsqrt(t_float f)
{
long l = *(long *)(&f);
if (f < 0) return (0);
else return (rsqrt_exptab[(l >> 23) & 0xff] *
rsqrt_mantissatab[(l >> 13) & 0x3ff]);
}
t_float q8_sqrt(t_float f)
{
long l = *(long *)(&f);
if (f < 0) return (0);
else return (f * rsqrt_exptab[(l >> 23) & 0xff] *
rsqrt_mantissatab[(l >> 13) & 0x3ff]);
}
/* the old names are OK unless we're in IRIX N32 */
#ifndef N32
t_float qsqrt(t_float f) {return (q8_sqrt(f)); }
t_float qrsqrt(t_float f) {return (q8_rsqrt(f)); }
#endif
|
