Last change
on this file since 577 was
444,
checked in by satin@…, 6 years ago
|
add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
|
File size:
1.1 KB
|
Line | |
---|
1 | |
---|
2 | /* @(#)z_numtest.c 1.0 98/08/13 */ |
---|
3 | /****************************************************************** |
---|
4 | * Numtest |
---|
5 | * |
---|
6 | * Input: |
---|
7 | * x - pointer to a floating point value |
---|
8 | * |
---|
9 | * Output: |
---|
10 | * An integer that indicates what kind of number was passed in: |
---|
11 | * NUM = 3 - a finite value |
---|
12 | * NAN = 2 - not a number |
---|
13 | * INF = 1 - an infinite value |
---|
14 | * 0 - zero |
---|
15 | * |
---|
16 | * Description: |
---|
17 | * This routine returns an integer that indicates the character- |
---|
18 | * istics of the number that was passed in. |
---|
19 | * |
---|
20 | *****************************************************************/ |
---|
21 | |
---|
22 | #include "fdlibm.h" |
---|
23 | #include "zmath.h" |
---|
24 | |
---|
25 | #ifndef _DOUBLE_IS_32BITS |
---|
26 | |
---|
27 | int |
---|
28 | numtest (double x) |
---|
29 | { |
---|
30 | __uint32_t hx, lx; |
---|
31 | int exp; |
---|
32 | |
---|
33 | EXTRACT_WORDS (hx, lx, x); |
---|
34 | |
---|
35 | exp = (hx & 0x7ff00000) >> 20; |
---|
36 | |
---|
37 | /* Check for a zero input. */ |
---|
38 | if (x == 0.0) |
---|
39 | { |
---|
40 | return (0); |
---|
41 | } |
---|
42 | |
---|
43 | /* Check for not a number or infinity. */ |
---|
44 | if (exp == 0x7ff) |
---|
45 | { |
---|
46 | if(hx & 0xf0000 || lx) |
---|
47 | return (NAN); |
---|
48 | else |
---|
49 | return (INF); |
---|
50 | } |
---|
51 | |
---|
52 | /* Otherwise it's a finite value. */ |
---|
53 | else |
---|
54 | return (NUM); |
---|
55 | } |
---|
56 | |
---|
57 | #endif /* _DOUBLE_IS_32BITS */ |
---|
Note: See
TracBrowser
for help on using the repository browser.