1/* s_logbf.c -- float version of s_logb.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3 */
4
5/*
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
8 *
9 * Developed at SunPro, a Sun Microsystems, Inc. business.
10 * Permission to use, copy, modify, and distribute this
11 * software is freely granted, provided that this notice
12 * is preserved.
13 * ====================================================
14 */
15
| 1/* s_logbf.c -- float version of s_logb.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3 */
4
5/*
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
8 *
9 * Developed at SunPro, a Sun Microsystems, Inc. business.
10 * Permission to use, copy, modify, and distribute this
11 * software is freely granted, provided that this notice
12 * is preserved.
13 * ====================================================
14 */
15
|
19
20#include "math.h"
21#include "math_private.h"
22
23static const float
24two25 = 3.355443200e+07; /* 0x4c000000 */
25
26float
27logbf(float x)
28{
29 int32_t ix;
30 GET_FLOAT_WORD(ix,x);
31 ix &= 0x7fffffff; /* high |x| */
32 if(ix==0) return (float)-1.0/fabsf(x);
33 if(ix>=0x7f800000) return x*x;
34 if(ix<0x00800000) {
35 x *= two25; /* convert subnormal x to normal */
36 GET_FLOAT_WORD(ix,x);
37 ix &= 0x7fffffff;
38 return (float) ((ix>>23)-127-25);
39 } else
40 return (float) ((ix>>23)-127);
41}
| 18
19#include "math.h"
20#include "math_private.h"
21
22static const float
23two25 = 3.355443200e+07; /* 0x4c000000 */
24
25float
26logbf(float x)
27{
28 int32_t ix;
29 GET_FLOAT_WORD(ix,x);
30 ix &= 0x7fffffff; /* high |x| */
31 if(ix==0) return (float)-1.0/fabsf(x);
32 if(ix>=0x7f800000) return x*x;
33 if(ix<0x00800000) {
34 x *= two25; /* convert subnormal x to normal */
35 GET_FLOAT_WORD(ix,x);
36 ix &= 0x7fffffff;
37 return (float) ((ix>>23)-127-25);
38 } else
39 return (float) ((ix>>23)-127);
40}
|