source: azure_iot_hub/trunk/musl-1.1.18/src/math/nextafterl.c@ 389

Last change on this file since 389 was 389, checked in by coas-nagasima, 5 years ago

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Line 
1#include "libm.h"
2
3#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
4long double nextafterl(long double x, long double y)
5{
6 return nextafter(x, y);
7}
8#elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
9long double nextafterl(long double x, long double y)
10{
11 union ldshape ux, uy;
12
13 if (isnan(x) || isnan(y))
14 return x + y;
15 if (x == y)
16 return y;
17 ux.f = x;
18 if (x == 0) {
19 uy.f = y;
20 ux.i.m = 1;
21 ux.i.se = uy.i.se & 0x8000;
22 } else if ((x < y) == !(ux.i.se & 0x8000)) {
23 ux.i.m++;
24 if (ux.i.m << 1 == 0) {
25 ux.i.m = 1ULL << 63;
26 ux.i.se++;
27 }
28 } else {
29 if (ux.i.m << 1 == 0) {
30 ux.i.se--;
31 if (ux.i.se)
32 ux.i.m = 0;
33 }
34 ux.i.m--;
35 }
36 /* raise overflow if ux is infinite and x is finite */
37 if ((ux.i.se & 0x7fff) == 0x7fff)
38 return x + x;
39 /* raise underflow if ux is subnormal or zero */
40 if ((ux.i.se & 0x7fff) == 0)
41 FORCE_EVAL(x*x + ux.f*ux.f);
42 return ux.f;
43}
44#elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
45long double nextafterl(long double x, long double y)
46{
47 union ldshape ux, uy;
48
49 if (isnan(x) || isnan(y))
50 return x + y;
51 if (x == y)
52 return y;
53 ux.f = x;
54 if (x == 0) {
55 uy.f = y;
56 ux.i.lo = 1;
57 ux.i.se = uy.i.se & 0x8000;
58 } else if ((x < y) == !(ux.i.se & 0x8000)) {
59 ux.i2.lo++;
60 if (ux.i2.lo == 0)
61 ux.i2.hi++;
62 } else {
63 if (ux.i2.lo == 0)
64 ux.i2.hi--;
65 ux.i2.lo--;
66 }
67 /* raise overflow if ux is infinite and x is finite */
68 if ((ux.i.se & 0x7fff) == 0x7fff)
69 return x + x;
70 /* raise underflow if ux is subnormal or zero */
71 if ((ux.i.se & 0x7fff) == 0)
72 FORCE_EVAL(x*x + ux.f*ux.f);
73 return ux.f;
74}
75#endif
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