source:
azure_iot_hub/trunk/musl-1.1.18/src/math/modf.c@
389
Last change on this file since 389 was 389, checked in by , 5 years ago | |
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File size: 536 bytes |
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1 | #include "libm.h" |
2 | |
3 | double modf(double x, double *iptr) |
4 | { |
5 | union {double f; uint64_t i;} u = {x}; |
6 | uint64_t mask; |
7 | int e = (int)(u.i>>52 & 0x7ff) - 0x3ff; |
8 | |
9 | /* no fractional part */ |
10 | if (e >= 52) { |
11 | *iptr = x; |
12 | if (e == 0x400 && u.i<<12 != 0) /* nan */ |
13 | return x; |
14 | u.i &= 1ULL<<63; |
15 | return u.f; |
16 | } |
17 | |
18 | /* no integral part*/ |
19 | if (e < 0) { |
20 | u.i &= 1ULL<<63; |
21 | *iptr = u.f; |
22 | return x; |
23 | } |
24 | |
25 | mask = -1ULL>>12>>e; |
26 | if ((u.i & mask) == 0) { |
27 | *iptr = x; |
28 | u.i &= 1ULL<<63; |
29 | return u.f; |
30 | } |
31 | u.i &= ~mask; |
32 | *iptr = u.f; |
33 | return x - u.f; |
34 | } |
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